Journal of Industrial Information Integration 33 (2023) 100470 Contents lists available at ScienceDirect Journal of Industrial Information Integration journal homepage: www.sciencedirect.com/journal/journal-of-industrial-information-integration Review article State-of-the-art AI-based computational analysis in civil engineering Chen Wang a, Ling-han Song a, Zhou Yuan a, Jian-sheng Fan a, b, * a b Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing, 100084, China Beijing Engineering Research Center of Steel and Concrete Composite Structures, Tsinghua University, Beijing, 100084, China A R T I C L E I N F O A B S T R A C T Keywords: Civil engineering Artificial intelligence Computational analysis Research review Machine learning Deep learning With the informatization of the building and infrastructure industry, conventional analysis methods are grad­ ually proving inadequate in meeting the demands of the new era, such as intelligent synchronization and realtime simulation. Artificial intelligence (AI) technology has emerged as a promising alternative due to its high expressiveness, efficiency, and scalability. This has given rise to a new research field of AI-based computation in civil engineering. In this study, a state-of-the-art review of the research on material and structural analyses using AI technology in civil engineering was performed to provide a general introduction to the current progress. The research was classified into static feature studies, dynamic feature studies, and composite feature studies ac­ cording to the problem inputs. The general methodology, commonly used AI models, and representative ap­ plications of each research category were elaborated. On these bases, the strengths and weaknesses of current studies were discussed. To demonstrate the accuracy and efficiency of AI models in comparison with conven­ tional numerical methods, a concrete example of an end-to-end deep learning framework for structural analysis was highlighted. Finally, we suggested four open problems from the perspective of engineering applications, indicating the major challenges and future research directions regarding AI-based computational analysis in civil engineering. 1. Introduction In recent years, the rise of digital technologies, such as the concept of the digital twin [1,2], has led to an increased interest in the development of modern computational techniques across many engineering areas. This has prompted a pursuit of more intelligent and synchronized methods for simulating physical entities in the virtual world [3]. In the field of civil engineering, computational analysis of con­ struction materials and structures serves as a fundamental technique throughout the building and infrastructure industry lifecycle, and plays a crucial role in connecting reality and virtuality. While numerical computing techniques, especially finite element analysis (FEA), have significantly enhanced the complexity of computable problems in en­ gineering practice [4–7], they are not without limitations. Firstly, the accuracy of the computation results depend on the underlying consti­ tutive models and their numerical implementation algorithms [8–11], which are interdisciplinary, requiring significant research effort and time to develop appropriate models. Secondly, the computational effi­ ciency of such approaches is inadequate for large-scale structures or complex analyses involving high-dimensional elements [12,13]. For instance, simulating the elastoplastic hysteretic response of a steel plate shear wall structure with shell elements can take several hours [14], which places a heavy time burden on parametric analysis in engineering design. Thirdly, the transferability and scalability of models across different platforms are restricted. Despite numerous commercial pack­ ages offering interactive interfaces, the quality of computation results is influenced by the user’s familiarity with the platform, limiting the dissemination and refinement of good models across different com­ mercial software. In short, classic numerical methods still require sig­ nificant manual effort and are falling short of the new-era requirements in terms of accuracy, efficiency, openness, and generality, leading to an urgent need for more advanced information technologies to achieve substantial improvements. From the perspective of phenomenological modeling [15–17], emerging artificial intelligence (AI) technologies [18–21], especially machine learning (ML) and deep learning (DL) techniques, are prom­ ising alternatives that provide new possibilities for breaking through empirical cognition and eliminating manual intervention. ML, including DL, is capable of learning latent patterns directly from data and approximating arbitrary continuous functions that map input spaces to * Corresponding author at: Department of Civil Engineering, Tsinghua University, Haidian District, Beijing, China. E-mail address: fanjsh@tsinghua.edu.cn (J.-s. Fan). https://doi.org/10.1016/j.jii.2023.100470 Available online 5 May 2023 2452-414X/© 2023 Published by Elsevier Inc. C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 output spaces [22–24]. Furthermore, the increase in the computing power supported by graphics processing units (GPUs) [25] and tensor processing units (TPUs) [26,27] endows these new intelligent models with significantly improved computational efficiency over traditional methods after deployment. In addition, most state-of-the-art AI models are developed on open-source platforms in the Python language [28,29], making them highly scalable and transferable. These advantages of AI have catalyzed new research paradigms, accelerating research processes in many engineering disciplines [30,31] and helping to discover new scientific knowledge. Accordingly, an increasing number of scholars are exploring the applications of AI technologies in the computational analysis of construction materials and structures, which leads to a new research hotspot of AI-based computational analysis in civil engineering. Research on the applications of AI in other areas in civil engineering, such as structural health monitoring [32] and construction management [33,34], started early and has yielded a wealth of successful explorative experience [35–39]. Many review studies have summarized critical techniques and prospected future development [40–45]. However, the field of AI-based computational analysis in civil engineering is still in its infancy. Adeli [46] briefly reviewed early neural networks in structural engineering and their applications in intelligent modeling of structural materials and design optimization. Tapeh and Naser [47] classified and summarized the applications of AI technologies (including ML and DL) in structural engineering based on different scenarios, such as earth­ quake and wind engineering. This review provided numerous specific AI-based computing examples and conducted scientometric analysis. However, the review did not further refine the methodology of intelli­ gent computing, and there were many overlaps in the technical routes among different scenarios, with only changes in the predicted targets. Therefore, this emerging research direction still lacks systematic orga­ nization and analysis. A review that can distill general methodology of AI-based computing will benefit researchers and engineers by providing insight into current research progress and inspiring future academic explorations and engineering applications. This study provides a review of AI-based computational research related to material and structural analysis in civil engineering. The remainder of this paper is organized as follows. Section 2 demonstrates the rationality of applying AI to the field of computational analysis in civil engineering and identifies key aspects used to classify the subse­ quent review. Section 3 introduces the literature search and selection criteria. On this basis, the current state-of-the-art research is reviewed in Sections 4~6 by summarizing the general research methodology, overviewing commonly used AI algorithms, and presenting representa­ tive applications. In Section 7, the current progress is analyzed, espe­ cially about the limitations of the existing research. We introduce a recent study on end-to-end DL-based structural analysis in Section 8, which provides a concrete example to address the present limitations and demonstrate the performance of AI models. Finally, in Section 9, four open problems for future research on AI-based computational analysis in civil engineering are proposed. models typically involve selecting key points on response curves based on experimental results, such as the yield point and the ultimate loading capacity point of each cycle. Parametric analysis is then performed to identify correlations between the key points and intrinsic features of structures, such as geometric information and construction configura­ tions. Finally, appropriate functions are constructed to describe the curve shape and cyclic behavior connecting neighboring key points. Examples of macroscopic models include the reinforced concrete (RC) coupling beam model proposed by Ding et al. [48] and the steel brace model proposed by Liu et al. [49]. The mathematical mechanism of the macroscopic models is function fitting based on human experience and experimental observations, without strong mechanical restrictions. The material-based elaborate models are further subdivided into constitutive models based on artificial laws and constitutive models within the classic elastoplasticity framework. The former follow modeling pro­ cedures similar to those of macroscopic models, such as constitutive studies on concrete [50,51]. The latter are more abstract, which corre­ spond to an optimization problem with the principle of maximum plastic dissipation as the objective function [8]: max σ : ε˙p + q⋅α̇ σ,q s.t. (1) , f (σ, q) ≤ 0 where f(σ, q) is the yield criterion; q represents the internal variable vectors; and α denotes the conjugate variables of q. Assuming that the yield criterion is convex, which can be satisfied by most construction materials in civil engineering, the Lagrange dual problem of the above optimization problem is max inf L (σ, q, λ) = − σ : ε˙p − q⋅α̇ + λf (σ, q) σ,q , s.t. (2) λ≥0 where λ is the Lagrangian multiplier. Then, the Karush-Kuhn-Tucker (KKT) conditions [52] for this problem are ⎧ ⎪ ∂f ⎪ ⎪ ⎪ ∇σ L (σ, q, λ) = 0⇒ εp ⋅ = λ ⎨ ∂σ . (3) ⎪ ∂f ⎪ ⎪ ⎪ ⎩ ∇q L (σ, q, λ) = 0⇒α̇ = λ ∂q Accordingly, the associative flow rule, which is widely adopted in classic elastoplasticity, belongs to the KKT conditions, and the plastic flow increment λ, which is critical in numerical implementations such as the return mapping algorithm [53,54], is the Lagrangian multiplier of the dual problem. Eqs. (1)~(3) indicate that the yield criterion and the hardening laws that control the evolution of internal variables can all be manipulated. Most classic elastoplastic constitutive models use mathe­ matical regression to formulate special hardening laws that reproduce coupon test results [55]. For instance, the elastoplastic model of struc­ tural steel proposed in [56] developed the external Chaboche-Voce combined hardening framework and the internal "incomplete collapse effect of the memory surface" concept based on experimental observa­ tions that the trends of cyclic hardening or softening resembled expo­ nential functions. In summary, the mathematical mechanism of most classic computational models in civil engineering can be attributed to phenomenological regression. Therefore, applying AI technologies with powerful regressive capabilities [22,23] to replace artificial functions is theoretically feasible and reasonable, which is anticipated to yield significantly improved model performance. In addition, the previous discussion reveals that all computational models in civil engineering involve the handling of two key aspects: (1) the intrinsic properties of the simulated objects, such as material strengths and structural geometric parameters; and (2) the external stimuli, mainly in the form of different loads and loading protocols. The intrinsic properties, which we refer to as static features, primarily affect 2. Rationale for applying AI Despite increasing studies on the application of AI models to computational analysis in civil engineering, the underlying rationale has not been fully demonstrated. In this section, we aim to address this gap by revisiting classic numerical methods and deriving the mathematical logic for incorporating AI into the field of computational analysis in civil engineering. This will provide a scientific basis for the use of AI and help establish appropriate classification criteria for subsequent literature reviews. Classic numerical studies in civil engineering focused on three levels of application scenarios, the construction material level, the structural member level, and the structural system level. These studies can be broadly divided into two categories: member-/system-based macro­ scopic models and material-based elaborate models. The macroscopic 2 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 the basic mechanical properties (such as the initial stiffness and ultimate loading capacity) and control the shapes of full-range responses (such as the pinching effect) [57–59]. On the other hand, the external stimuli, referred to as dynamic features, govern loading and unloading conditions in full-range responses and induce strong path-dependent effects in nonlinear analyses [60,61]. These two types of features, as well as their synthesis, require different modeling methods and derive distinctive technical routes. Therefore, the subsequent review classifies the current research into three major categories: static feature studies, dynamic feature studies, and composite feature studies. (5) Quality assessment: To ensure the inclusion of only high-quality research, the selected articles were assessed according to the Journal Citation Reports service, and mainly those published in journals with a ranking above Q2 were chosen. Following these literature search and selection procedures, 150 ar­ ticles were used in this review, which were presented in the Appendix Table A1. Furthermore, quantitative analyses were performed to reveal the trends of this emerging research area, which are presented in the subsequent sections. 3. Literature search and selection 4. Static feature studies This study performed sample collection of peer-reviewed articles from well-accepted academic databases. The search and selection criteria are summarized as follows: From this section, state-of-the-art studies on the AI-based computa­ tional analysis of construction materials and structures in civil engi­ neering are systematically investigated. The studies are classified into three categories based on the nature of their problem inputs: static feature studies, dynamic feature studies, and composite feature studies. For each category, we summarize the general methodology, introduce commonly used intelligent algorithms, and present typical applications at all three levels (i.e., construction materials, structural members, and structural systems). (1) Literature databases for search: Web of Science, Science Direct, Scopus, ASCE Library, Wiley Online Library, Engineering Village, and ProQuest. (2) Keyword selection: The keywords were divided into two groups. The first group was within the scope of artificial intelligence, such as “artificial intelligence”, “machine learning”, “deep learning”, “neural network”, etc. The second group was within the scope of civil engineering, such as “civil engineering”, “structural engi­ neering”, “seismic performance”, “loading capacity”, “deforma­ tion”, etc. By combining words or phrases from the two groups (e. g., "deep learning in structural engineering"), we generated search terms to identify relevant articles. This led to a large pool of candidate articles for selection. (3) Inclusion criteria: To be included in our review, articles had to focus on the computational analysis of materials or structures in civil engineering and predict at least one aspect of their perfor­ mance or response, such as material strength or structural deformation patterns, through the use of AI models. Articles that explored AI methods in other fields of civil engineering, such as the use of convolutional neural networks to identify the crack width of concrete structures in structural diagnosis and mainte­ nance, were excluded. (4) Screening process: The initial screening process involved check­ ing the titles, abstract and keywords of candidate articles to identify duplicates, while the introduction and conclusions were analyzed to ensure that the selected articles aligned with the re­ view objective. Next, we read the entire article and compiled relevant information (e.g., title, source, year of publication, au­ thors, prediction targets, algorithms, and input data) in an Excel file for organization. 4.1. General research pipelines of static feature studies In general, static feature studies focus on problems where classic analytical solutions are not feasible, or where numerous variables make it challenging to identify quantitative relationships between inputs and outputs. The inputs of these studies are typically the intrinsic properties of construction materials and structures, such as material constituents and structural construction configurations, which remain almost invariant during the loading processes. The outputs are scalar mechan­ ical indices, such as the shear capacities of concrete structures or the strengths of fiber-reinforced materials (as shown in Fig. 1). Conven­ tionally, the design formulas of these mechanical indices were derived by mathematically fitting the results from large-scale FE parametric analysis [62–64], wherein the FE models were validated by experiments. However, static feature studies using AI technology substitute manually fitted equations with ML or DL models, leading to more expressive and accurate results. Moreover, the computational efficiency of intelligent models allows for easy distinction of the significance of each input variable through sensitivity analysis. The general research pipeline of current static feature studies can be summarized as follows. (1) Establish a dataset with sufficient data by experiments or FE analysis. Fig. 1. Illustration of static feature studies. 3 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 (2) Determine the input features according to the researchers’ experience or domain-specific knowledge. (3) Select appropriate AI models and train them with the dataset. (4) Compare the predicted results with empirical equations or cur­ rent codes. (5) Perform sensitivity analysis to reveal the significance of each input variable. 4.2. AI models in static feature studies The AI models commonly used in static feature studies are analyzed, and their distribution is displayed in Fig. 2. To better illustrate their applications in the following sections, popular AI models are overviewed for a fundamental technical background. Artificial neural networks (ANNs), the most commonly-used algo­ rithm in static feature studies, consist of multilayer nodes (also called neurons) and their interconnections [65], as shown in Fig. 3(a). Each connection between two nodes at the neighboring layer represents a linear transformation of the signal: ( ) x(l+1) = ϕ wT(l+1) x(l) + b(l+1) , (4) Fig. 2. Statistical distribution of intelligent algorithms in static feature studies. (LR: logistic regression; LNR: linear or nonlinear regression; KNN: K-nearest neighbors; SVM: support vector machine; DT: decision tree; ANN: artificial neural network; DL: other deep learning models except ANNs). where the subscripts l and l + 1 denote layer numbers; x is the set of neural nodes; w and b are the weight and bias of the linear trans­ formation, respectively; and ϕ is an activation function that infuses nonlinearity into ANNs, such as the rectified linear unit (ReLU) [66] and Fig. 3. Illustration of commonly-used intelligent algorithms in static feature studies. 4 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 the sigmoid function. By aggregating multiple nonlinear layers, ANNs can approximate any continuous function [24]. Support vector machines (SVMs) [67] are a class of classic supervised ML models that can be applied to both classification tasks and regression tasks [68]. In applications, SVMs typically map the given data to a high-dimensional space via kernel functions and search for a hyperplane to separate the data with the maximal margin in classification tasks or a band to encompass the data with the minimal margin in regression tasks (Fig. 3(b)). The learning process can be abstracted as a convex optimi­ zation problem. For instance, in regression tasks, training an SVM cor­ responds to solving min w s.t. 1 ‖ w ‖2 2 , |yi − 〈w, ϕ(xi )〉 − b| ≤ ε 4.3. Typical applications of static feature learning Table 1 presents a selection of representative applications in static feature studies across all three scenarios (construction materials, struc­ tural members, and structural systems) in recent years (mainly since 2018). For a comprehensive list, please refer to Table A1 in the Appendix. At the construction material level, the mechanical properties of various concrete types with different additives have been the focal point of static feature studies for decades [106–109]. Getahun et al. [73] utilized an ANN to predict the 28-day strength of concrete incorporating construction debris and agricultural waste. Ly et al. [81] trained an ANN on 233 experimental data to estimate the compressive strength of rubber concrete based on the input mixture, achieving high accuracy. Yang et al. [75] leveraged an RF to predict the dynamic increase factor (DIF) of steel-fiber-reinforced concrete (SFRC) with the strain rate, matrix strength, fiber dosage, and fiber properties. Based on the trained model, a sensitivity analysis was performed to identify the parameter with the greatest influence on the DIF of SFRC. Chen et al. [82] compared the performance of various algorithms, including ANN, SVM, boosting, and RF, to investigate the bond strength between carbon fiber-reinforced polymer (CFRP) and steel, finding that the boosting algorithm ach­ ieved the best accuracy. The learned models were further interpreted via a parametric analysis. At the structural member level, most relevant studies have adopted a similar methodology to that used at the material level, with a focus on predicting the mechanical performance of various structural compo­ nents [86–91]. Sirca Jr. and Adeli [104] utilized neural networks to predict the uplift load capacity of metal roof panels, achieving sub­ stantially more accurate results than the conventional method. Sarve­ ghadi et al. [105] estimated the shear strength of SFRC beams using multi-expression programming, which outperformed several equations in the literature. Mangalathu et al. [85] investigated the failure modes and shear capacities of RC beam-column joints using several ML algo­ rithms, such as logistic regression (LR), Lasso regression, K-nearest neighbors (KNN), and RF, to identify the best approach. Naser [87] explored the temporal responses of RC structures under fire conditions by incorporating heating time as one of the input features in an ANN, transforming the target problem into a series of static feature learning processes. In recent years, as composite structures have gained popu­ larity, AI models have also been applied to predict the mechanical properties of such structures. For instance, ML models have been used to predict the capacity of CFST [93–95] and fiber-reinforced RC structures [92,96]. (5) where (xi, yi) is a training data tuple; and ε is the threshold. The decision tree (DT) algorithm, which continuously classifies the attributes of sample data in a top-down manner as shown in Fig. 3(c), evolved from the field of decision analysis. The key step is to decide the attribute node to generate new branches. For example, classification and regression trees (CARTs) [69] are nonparametric DTs that can be applied to both discrete and continuous attributes, which utilize the Gini index as the branching criterion: Gini(D|A) = n ∑ |Di | i=1 |D| Gini(D), (6) where A is the attribute candidate; D is the set of sample data to be split; Di is the subset of D when A takes the ith value; |D| denotes the size of the dataset; and Gini(D) describes the “purity” of the dataset: )2 n ( ∑ |Ck | Gini(D) = 1 − , (7) |D| k=1 where Ck is the subset of data that belong to the kth class. At each iter­ ation, the CART selects the attribute with the minimal Gini value and splits the dataset into two parts. To enhance the expressiveness of individual algorithms, ensemble learning techniques [70] integrate multiple ML models with different strategies, among which bagging and boosting are the two most popular methods. Bagging, represented by the random forest (RF, Fig. 3(d)) al­ gorithm, generates a random data subset with replacement from the entire database (called a bootstrapped dataset) for each decision tree model, and each subset is trained separately. During the test stage, the global prediction is obtained by aggregating the individual prediction of each decision tree with specified rules such as average pooling. In contrast to treating all samples equally, a boosting algorithm (Fig. 3(e)) recurrently adjusts the weights of incorrectly predicted data and uses them to train a new underlying model (called a weak learner). By incrementally fitting the residual bias, boosting converts a series of weak learners into a strong learner with high accuracy. Typically, the boosting algorithm performs better than the bagging algorithm but is more likely to overfit the data. According to Fig. 2, ANNs and classic ML algorithms, such as SVM and boosting, are preferred in static feature studies, while advanced DL models are seldom used. This can be attributed to two factors. First, ANNs and classic ML algorithms are integrated into many scientific computing packages, such as MATLAB and Scikit-learn [71], which offer convenient function interfaces and do not require secondary develop­ ment or architectural innovation. Consequently, they have lower learning costs and application thresholds. Second, the volume of data in civil engineering is not abundant. As illustrated in Fig. 4, nearly 80% of datasets collected in static feature studies are smaller than 1000, which makes it challenging to train a DL model fully and may lead to over­ fitting problems that harm generalization capabilities. Fig. 4. Statistical distribution of the data sizes used in static feature studies. 5 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 Table 1 Typical applications of static feature learning. Construction material level Structural member level Structural system level Author Year Task Algorithm Behnood et al. [72] Getahun et al. [73] Bui et al. [74] Yang et al. [75] Abueidda et al. [76] Feng et al. [77] Kaloop et al. [78] Zhang et al. [79] 2018 2018 2018 2019 2019 2020 2020 2021 ANN ANN ANN RF CNN boosting boosting RF Salimbahrami et al. [80] Ly et al. [81] Chen et al. [82] Kang et al. [83] Naderpour et al. [84] Mangalathu et al. [85] Alwanas et al. [86] Naser [87] Keshtegar et al. [88] Abambres et al. [89] Zhang et al. [90] Feng et al. [91] Kaveh et al. [92] Vu et al. [93] Zarringol et al. [94] Chou et al. [95] Alam et al. [96] Morfidis et al. [97] Sun et al. [98] Huang et al. [99] Hwang et al. [100] 2021 Compressive strength of silica fume concrete Strength of concrete containing agricultural and construction wastes Compressive and tensile strength of high performance concrete (HPC) Dynamic increase factor for steel fiber-reinforced concrete (SFRC) Mechanical properties of composite Compressive strength of concrete Compressive strength of HPC Bond strength of near-surface-mounted fiber-reinforced polymer (FRP) bonded to concrete Compressive strength of recycled aggregate concrete 2021 2021 2021 2018 2018 2019 2019 2019 2020 2020 2021 2021 2021 2021 2022 2022 2017 2019 2019 2021 Compressive strength of rubber concrete CFRP-steel bond strength Compressive and flexural strength of SFRC Shear resistance of concrete beams reinforced by FRP bars Failure modes and shear strengths of RC beam-column joints Load-carrying capacity and mode failure of beam-column joint connection Responses of RC beams and columns in extreme conditions Shear strength of steel fiber-unconfined RC beams Shear capacities of one-way slabs under concentrated loads Shear capacities of RC deep beams Plastic hinge lengths of RC columns Buckling loads of fiber steering composite cylinders Concentric load capacities of concrete-filled steel tube (CFST) columns Ultimate strength of CFCFST Axial compression capacity of CFST Shear strength of FRP-reinforced concrete members Maximal interstory drift of RC frames Maximal interstory drift of RC frames In-plane failure modes for RC frames with infills Maximal interstory drift and failure modes of RC frames 2021 2021 2021 Seismic drift estimation for steel frames Buckling loads of imperfect reticulated shells Holistic performance of RC frames ANN ANN, SVM, DT, boosting, RF KNN, LNR, SVM, ANN, boosting ANN LR, LNR, KNN, DT, RF, SVM, etc. ANN ANN SVM ANN SVM, ANN, boosting boosting RF, DT, LNR, ANN boosting SVM, ANN ANN ANN ANN LNR, SVM boosting, DT, LR, ANN, RF, SVM LNR, DT, RF, KNN, RF, boosting, etc. RF ANN, SVM LNR, KNN, SVM, boosting, RF Guan et al. [101] Zhu et al. [102] Esteghamati et al. [103] Applications at the structural system level have mainly focused on regular structures that can be characterized by finite features. Guan et al. [101] utilized building information (such as the number of stories, number of bays, and bay width), fundamental analysis information from conventional FE nonlinear analysis (such as the first four modal shapes and periods, the yield force and the associated drift in the pushover analysis), and spectral intensity parameters to estimate the story drifts of steel special moment resisting frames with an RF. This study innova­ tively augmented the input features with results from FE analysis, which injected heuristic knowledge into ML, thus successfully enhancing the model performance. Zhu et al. [102] predicted the nonlinear buckling loads of single-layer reticulated shells considering imperfections by ANN and SVM according to the height-to-span ratios, numbers of rings, and boundary conditions. Esteghamati et al. [103] developed an ML pipeline to assess the performance of mid-rise RC frame buildings, extending the prediction target to include realistic impacts and providing a practical approach for evaluating seismic vulnerability and environmental behavior in the early design stage. As this study revealed, the assessment of engineering structures can be abstracted as a multi-objective regres­ sion problem, enabling a methodology similar to that used in static feature studies. ANN, SVM perspective, the prediction of the full-range response of a material or structure specimen corresponds to a regression problem between two sequences, such as the hysteretic load-displacement curves [110]. Accordingly, the AI models that cope with sequence analysis can be applied to dynamic feature learning, which derive two research branches with regard to the ranges of the input sequences of interest. The first research branch focuses on predicting future responses based on past responses of a single sequence (as illustrated in Fig. 5), which aligns with standard time series analysis. The general research pipeline for this branch can be summarized as follows. (1) Select a response sequence and divide it into a training interval and a test interval. (2) Divide the training interval into multiple pieces of data, each comprising an input segment and a target segment. (3) Train an intelligent model with the data pieces from the training interval. (4) Validate the accuracy of the trained model using the test interval. The first branch of dynamic feature research has limited practical applications because the trained models cannot generalize to new stimuli. For practical engineering purposes, models that can simulate responses under different loading cases are required. Hence, the second branch of dynamic feature research aims to predict the full-range re­ sponses of construction materials or engineering structures under new stimuli by learning the entire response sequences in the training set (as illustrated in Fig. 6). This branch aligns with mainstream AI domains and is similar to sequence tasks in natural language processing (NLP) [111], such as machine translation, in which AI models can translate new sentences from the source language to the target language after learning the given corpus. Similarly, the general research pipeline of 5. Dynamic feature studies 5.1. General research pipelines of dynamic feature studies Dynamic feature studies aim to predict the full-range responses of a construction material or structure specimen under various external stimuli. In contrast to static features such as structural geometries, dy­ namic features, which mainly manifest in loading protocols, exhibit more randomness, such as the earthquake stimuli. From a mathematical 6 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 branch, any time series analysis model can be employed, making ANNs a popular choice due to their simplicity. However, for the second branch that predicts full-range responses of materials and structures, classic numerical studies have identified three main challenges that need to be addressed [114]. Firstly, the significant memory effects of loading his­ tories require effective extraction of long-term history dependence, regardless of the loading step sizes. Secondly, ultralong sequences pre­ sent a complexity of O(L2) (L is the sequence length), making them prone to causing the out-of-GPU-memory problem, which can lead to the fading of memory effects and gradient explosion or vanishing. Finally, future information must be masked to prevent data leakage, which re­ quires advanced DL architectures with information transfer capabilities and parameter sharing mechanisms. ANNs are not suitable for this branch due to their lack of information transfer and parameter sharing mechanisms. Instead, more advanced DL architectures such as con­ volutional neural networks (CNNs) and RNNs (as shown in Fig. 8) are required to address these challenges. CNNs apply convolutional operations on neighboring elements and expand an extra dimension (called the channel dimension) to continu­ ously extract local information for memorizing historical states. RNNs have a natural causal autoregressive property and realize historydependent effects through the sequential transmission of hidden states. Two main variants of RNNs, LSTM and GRU, integrate different gates to enhance their long-term memory capabilities. LSTM uses three gates, namely the input gate, forget gate, and output gate, to selectively forget or retain information. GRU simplifies LSTM by using two gates, namely the reset gate and update gate. Compared with LSTM, GRU has fewer parameters and requires less computation, making it more effi­ cient in many practical applications. In addition to CNNs and RNNs, attention mechanisms [115] have recently emerged as an effective way to capture long-term dependencies in dynamic feature studies. Attention mechanisms use learned weights to selectively focus on certain elements in the input sequence and dynamically weigh their contributions to the output (shown in Fig. 9). Fig. 5. Illustration of the first branch of dynamic feature studies. (“XNN” represents any neural networks that are adopted for processing the sequence data). studies in the second branch can be summarized as follows. (1) Collect or generate a dataset that contains full-range responses obtained under different time histories of external stimuli. (2) Train an AI model with the dataset. (3) Validate the trained model by comparing its results with the experimental or elaborate FEA results obtained under new stimuli. 5.2. AI models in dynamic feature studies 5.3. Typical applications of dynamic feature learning The AI models used in dynamic feature studies are presented in Fig. 7, in which the long short-term memory (LSTM) [112] and gated recurrent unit (GRU) [113] are classified into the recurrent neural network (RNN) family. Contrary to static feature studies, dynamic feature studies seldom adopt classic ML algorithms but prefer DL algo­ rithms (this paper classifies ANNs into the domain of DL). This can be attributed to the sequential nature of dynamic features. Compared to static features, dynamic features have an additional dimension (i.e., sequence length) that can significantly enrich the data and support the full training of DL models. In addition, the prevalent ML models used in static feature studies cannot process sequences, making them unsuitable for dynamic feature learning. The choice of AI models for the two branches of dynamic feature studies differs due to the unique characteristics of the data. For the first Table 2 presents a selection of typical applications of dynamic feature learning in recent years, with a focus on studies since 2018, while several early studies are included to exemplify the concept of the first branch of dynamic feature learning. A more comprehensive list of applications can be found in Table A1 in the Appendix. At the construction material level, Jung et al. [116] developed two parallel ANNs in the total space and deviatoric space respectively to reproduce rate-dependent constitutive laws. The inputs at each incre­ ment were the outputs derived from the last step. Although simple ANN models were used, this method was equivalent to the unrolled format of an RNN model. Wang [118] used LSTM to model the creep evolution of concrete by learning the data in the early time window, which is a typical study belonging to the first branch. Bartošák [122] compared the Fig. 6. Illustration of the second branch of dynamic feature studies. 7 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 responses induced by wind or earthquakes. Jiang and Adeli [135] developed a wavelet neural network to identify the structural responses of two high-rising building structures taking into account geometric nonlinearities. Christiansen et al. [123] investigated the nonlinear re­ sponses of a wind turbine using an ANN in line with the strategy of the first branch, achieving close agreement with the FEA results. To accel­ erate the Monte Carlo method for assessing the reliability of a frame structure, Koeppe et al. [126] proposed a surrogate model with LSTM to predict its time-variant responses, which accurately matched the FE solutions. Huang et al. [129] trained LSTM and CNN as surrogate models to predict the nonlinear seismic responses of a two-story, three-span subway station. The good performance of the surrogate models proved their ability to capture the evolution characteristics of the probability density function of layer drift at low computational costs. Xu et al. [132] developed a robust LSTM model to predict the nonlinear seismic re­ sponses of a building sample, which was able to consider earthquakes with different spectral characteristics and amplitudes. In particular, based on the methodology of the second branch, Zhang et al. [127] complemented a physical loss that considered dynamic equilibrium at the ground, serving as a regularization term for the training processes and enhancing the physical interpretability of the computation results. Fig. 7. Statistical distribution of the intelligent algorithms used in dynamic feature studies. 6. Composite feature studies performance of ANN and RNN family models on life prediction for low-alloy martensitic steel. Wang et al. [114] introduced the Seq2Seq framework [133] (shown in Fig. 10) and the attention mechanism into computational analysis in civil engineering. This model reproduced the nonlinear behavior of BLY160 with strain range dependence effect and has proven to be more powerful than other sequence DL models in simulating nonlinear hysteretic responses [134]. Structural components have yet to be studied for dynamic features. At the structural system level, research has focused on nonlinear To achieve comprehensive analysis in civil engineering and obtain the full-range responses of various construction materials and structures, it is necessary to develop a composite feature learning approach that incorporates both intrinsic material and structural features as well as different external stimuli. However, current research on composite features is limited, as shown in Table 3. These studies adopt a similar methodology built on conventional member-based macroscopic models. As reviewed in Section 2, the member-based macroscopic models consist of a skeleton curve and artificial loading/unloading rules. The key points on the skeleton curve, such as the yield point and the ultimate capacity point, are related to the static features of materials or structures. Therefore, a popular research methodology is using AI models to predict these key points of a skeleton curve and simulating the full-range re­ sponses of different materials or structures using conventional macro­ scopic models. As an illustration, Liu et al. [137] proposed the use of an ANN to predict the key points of a trilinear lumped plasticity (LP) model for RC columns, which outperformed the LP model that relied on empirical equations. Han et al. [139] developed an ANN to estimate the skeleton curve of the Pinch-IMK model for RC beams using structural parameters such as concrete strength and section geometries as input features. 7. Analysis and discussion 7.1. Quantitative distribution of the current literature A quantitative analysis is performed on all the collected studies, and the results are plotted in Figs. 11 and 12. Fig. 11 shows that the numbers of studies on static feature learning, dynamic feature learning, and Fig. 8. Illustration of CNN and RNN models used in dynamic feature studies. (“FC” layer denotes fully-connected layer). Fig. 9. Illustration of the attention mechanism. 8 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 Table 2 Typical applications of dynamic feature learning. Construction material level Structural system level Author Year Task Algorithm Jung et al. [116] Ghavamian et al. [117] Wang et al. [118] Gorji et al. [119] Wang et al. [114] Feng et al. [120] Wang et al. [121] Bartošák [122] Christiansen et al. [123] Lagaros et al. [124] Kim et al. [125] Koeppe et al. [126] Zhang et al. [127] Oh et al. [128] Huang et al. [129] Torky et al. [130] Xue et al. [131] Xu et al. [132] 2006 2019 2020 2020 2020 2021 2021 2022 2011 2012 2019 2019 2020 2020 2020 2021 2021 2022 Rate-dependent constitutive model of materials (2nd branch) Constitutive relationship of Perzyna viscoplasticity (2nd branch) Creep evolution on concrete (1st branch) Anisotropic Yld2000–2d model with homogeneous anisotropic hardening (2nd branch) Elasto-plastic constitutive model of BLY160 (2nd branch) Elasto-plastic constitutive model of high-strength steel (2nd branch) Constitutive model of concrete and steel (2nd branch) Lifetime under low-cycle fatigue and thermo-mechanical fatigue loading Nonlinear dynamic responses of a wind turbine (1st branch) Nonlinear seismic responses of a frame structure (1st branch) Nonlinear hysteretic responses of a frame structure (2nd branch) Elasto-plastic responses of a steel frame structure (2nd branch) Seismic responses of structural systems (2nd branch) Seismic responses prediction for RC frame structures (2nd branch) Seismic responses of a subway station (1st branch) Nonlinear seismic responses of structural buildings (2nd branch) Wind-induced structural responses in a transmission tower (2nd branch) Nonlinear structural seismic responses of a frame structure (2nd branch) ANN LSTM LSTM ANN, GRU Seq2Seq, attention LSTM CNN ANN, LSTM, GRU ANN ANN CNN LSTM CNN CNN CNN, LSTM CNN, LSTM, ANN LSTM LSTM composite feature learning decrease in the listed order, indicating a rise in research barriers. The methodology of static feature studies is straightforward and similar to that of ordinary ML problems. In contrast, dynamic feature studies must consider the distinctive characteristics of computational analysis in civil engineering, such as the significant memory effect and causal autoregression. The composite feature studies, which are deemed most difficult, do not yet have fully-intellectualized solutions and still rely on conventional artificial constitutive rules. The increasing difficulty levels of these three research categories also man­ ifest in the complexity of commonly used AI algorithms. Classic machine learning algorithms are typically adopted in static feature studies, which are relatively simple and have been effectively integrated by commercial packages. Dynamic feature studies, on the other hand, require more complex deep learning models and advanced algorithms to address numerical challenges, which necessitates the design of proper archi­ tectures and tuning of hyperparameters. Fig. 12 presents the quantita­ tive distribution of the typical applications of each research category at different levels. The number of studies that concentrate on the structural member level using static feature learning ranks the first, indicating that researchers are more inclined to directly calculate static mechanical properties such as strength and stiffness, which also coincides with en­ gineering design habits. fitting, leading to accelerated discovery of computing methods for complex structures and novel materials. Dynamic feature studies focus on predicting full-range mechanical responses of the material or struc­ ture sample of interest under random external stimuli, taking into ac­ count material and geometric nonlinearities, especially the historydependent effect induced by cyclic loading. In these studies, AI models serve as surrogate models, accelerating the simulation processes instead of using conventional constitutive formulations and numerical solu­ tions. This approach achieves acceptable accuracy under certain con­ ditions with a low computational cost. Composite feature studies synthesize the former two research categories to obtain full-range re­ sponses of different construction materials or structures. AI models establish quantitative relationships between input features and target responses, replacing traditional numerical methods and eliminating the need for manual intervention, while achieving higher accuracy and efficiency. Additionally, the introduction of AI techniques reduces the domain knowledge requirements, as AI models automati­ cally recognize the underlying patterns in the input data, accelerating the discovery of mechanical laws from a phenomenological perspective. However, despite the progress made, limitations exist that impede further application of research achievements. Firstly, current research primarily focuses on upgrading AI models rather than addressing data-related issues. It has been widely acknowl­ edged that input data plays a crucial role in determining the final per­ formance of AI models [19]. However, many studies still relies on the manual selection of input features, and few have reported how to normalize inputs with different physical units and value magnitudes. Manual intervention in the feature selection process results in inevitable information loss, especially for problems that are not well explained by classic theories, such as the shear behavior of concrete structures This limitation hinders AI models from surpassing human knowledge to discover new scientific laws. Therefore, to fully exploit the "end-to-end" 7.2. Discussion of current progress The previous sections have demonstrated the effectiveness of AI techniques in facilitating computational analysis of construction mate­ rials and structures in civil engineering. Static feature studies aim to establish mapping relationships between intrinsic structural or material parameters, such as section geometries and material mixture pro­ portions, and their mechanical performance, such as strengths and failure modes. In these studies, AI models replace traditional function Fig. 10. Illustration of Seq2Seq architecture. (“XNN” and “YNN” represent any embedded neural networks used to process the sequences). 9 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 these models is limited by human knowledge in designing appropriate hysteretic rules, which prevents them from fully leveraging the excep­ tional regression capability of AI. In summary, composite feature studies that are completely based on AI solutions are still lacking. Last but not least, the prevailing models in static feature studies and dynamic feature studies, though both fall within the scope of AI, lack coordination, impeding the development of composite feature learning. As discussed in Sections 4 and 5, static feature studies tend to rely on ML models, while dynamic feature studies favor DL models. Classical ML models, such as SVMs and DTs, estimate target indicators directly but are unable to learn representations. Unlike DL models, ML models cannot extract useful information, such as hidden states, from the in­ termediate computing processes, making it difficult to incorporate static feature information into dynamic feature learning. Furthermore, DL models are optimized within backpropagation algorithm frameworks that use computational graphs [28,29], which makes it difficult to integrate ML models and implement end-to-end joint training. Table 3 Composite feature studies. Structural member level Structural system level Author Year Task Algorithm Luo et al. [136] 2018 SVM Liu et al. [137] 2019 Liu et al. [138] 2021 Han et al. [139] 2021 Zarringol et al. [140] 2022 Wen et al. [141] 2022 SoleimaniBabakamali et al. [142] 2022 Hysteretic behavior of RC columns Pseudo-static cyclic behavior of RC columns Hysteretic behavior of RC columns Hysteretic response of RC beams using the Pinch-IMK model Load-shortening curves of CFST columns Floor seismic responses of regular frame structures Probabilistic seismic demand analysis of RC frames ANN SVM ANN ANN CNN LSTM, CNN 8. An example of intelligent composite feature learning To demonstrate the exceptional performance of AI models compared with conventional numerical methods and provide an example of com­ posite feature learning as well, this section introduces a recent study by the authors [143] on an end-to-end DL framework – named Deep Structural Nonlinear Analysis (DeepSNA) – for computational analysis in civil engineering, which covered both the data and model sides and was completely based on DL. prediction capabilities of AI models, it is essential to establish a general data organization template and preprocessing method. Secondly, most static feature studies are interested in mechanical properties such as material strengths, structural loading capacities, and maximal interstory drift ratios. However, these mechanical properties are closely related to loading paths, which can experience strengthening or softening induced by cyclic loads [55,56], thereby affecting the re­ sults. Therefore, most static feature studies can be seen as simplified models that neglect the influence of loading path dependence. On the other hand, current state-of-the-art dynamic feature learning studies can only simulate the full-range responses of a specific sample, with input features limited to external stimuli. Although these AI models are generalizable and can be adapted to different scenarios, such as extending from the material level to the structural level by substituting the <strain, stress> pair with the <displacement, load> pair without altering the model architecture, they are unable to generalize to other construction materials or structures and require retraining from scratch. In short, to accurately predict the mechanical behavior of various ma­ terials and structures, core models must consider both intrinsic prop­ erties and external stimuli. Third, the composite feature studies presented in Section 6 have succeeded in obtaining the full-range responses of various structures. However, their research ideas are still essentially rooted in static feature learning. Furthermore, according to Cannikin’s law, the performance of 8.1. Data interface To maximally preserve raw information and minimize the human intervention involved with the input features, a general data interface schema with a core concept of “feature modules” (FMs) was designed by drawing from the “assembly” philosophy of the classic FE method. This concept breaks down the constituent elements of construction materials or structures into multiple modules and further classifies them into two categories in terms of their repeatability: fixed-length feature modules (FLFMs) and variable-length feature modules (VLFMs), which are orga­ nized as vectors and sequences, respectively. Take a steel plate shear wall (SPSW) structure as an example. The stiffeners of an SPSW can be arranged as a VLFM because multiple stiffeners commonly exist to prevent buckling. Within the stiffener FM, feature fields such as Fig. 12. Distribution of the applications in different scenarios. (SF: static feature studies; DF: dynamic feature studies; CF: composite feature studies). Fig. 11. Distribution of the three research categories. 10 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 Table 4 Two feature modules used for SPSW structures [143]. Feature field Data type Feature type Description Infill panels: VLFM n INT b FLOAT h FLOAT t FLOAT E FLOAT fy FLOAT eu FLOAT FLOAT fu cb FLOAT DENSE DENSE DENSE DENSE DENSE DENSE DENSE DENSE DENSE cc DENSE The floor number. The width of the infill panel on the given floor (mm). The height of the infill panel on the given floor (mm). The thickness of the infill panel on the given floor (mm). The elastic modulus of the infill panel on the given floor (GPa). The yield strength of the infill panel on the given floor (MPa). The limit strain of the infill panel on the given floor (με). The tensile strength of the infill panel on the given floor (MPa). The connections between the infill panel and the frame beams, which are measured by the bolt spacing (mm). A value of b indicates that the panel does not connect with the beams, while a value of 0 indicates that the panel is welded to the beams. The connections between the infill panel and the frame columns, which are measured by the bolt spacing (mm). A value of h indicates that the panel does not connect with the columns, while a value of 0 indicates that the panel is welded to the columns. FLOAT Perforations: VLFM n INT s INT cx FLOAT cy FLOAT p1 FLOAT p2 FLOAT DENSE SPARSE DENSE DENSE DENSE DENSE The floor number. The shape of the perforation, where 0 and 1 indicate elliptic and rectangular openings, respectively. The distance between the center of the perforation and the bottom-left point of the panel along the x-axis (mm). The distance between the center of the perforation and the bottom-left point of the panel along the y-axis (mm). The first geometric parameter of the perforation (mm). For an elliptic opening, p1 is the diameter along the x-axis; for a rectangular opening, p1 is the width along the x-axis. The second geometric parameter of the perforation (mm). For an elliptic opening, p2 is the diameter along the y-axis; for a rectangular opening, p2 is the height along the y-axis. positions and section stiffnesses are configured to describe each stiff­ ener. On the other hand, since only one top beam is contained in an SPSW structure, the top beam feature module was an FLFM. Table 4 gives a concrete example of two feature modules used for SPSW structures. Aggregating the sequences in VLFMs. To realize this goal, a pre-attention layer was developed with the standard attention mechanism followed by average pooling, which not only uncovered the collaborative effect within the VLFM but also introduced interactions between different constituent elements. (2) Learning the coupling relationships between different FMs. Due to material and geometric nonlinearity, the contri­ butions of various FMs to the overall responses did not satisfy the principle of superposition. Accordingly, a DCN [144] was introduced, which consisted of a cross network tower and a deep network tower. The cross network tower was responsible for memorability (i.e., similar materials or structures should yield similar responses) and only took a complexity of O(d) (d was the total dimensionality after the pre-attention layer) to increase the order of representation, effectively preventing the combinatorial explosion problem in cross learning. The deep network tower was a feedforward neural network (FFN) that 8.2. Static feature learning In contrast to directly predicting mechanical indicators, the static feature learning part of DeepSNA introduced the idea of representation learning to process the input data into a vector containing the dense information of given static features, which was analogous to the concept of embedding. Specifically, a DL model named Pre-Attention Deep & Cross Network (PADCN) was proposed, as shown in Fig. 13(a). The PADCN model was intended to implement two functions. (1) Fig. 13. Illustration of DeepSNA [143]. 11 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 pursued generalization through DL. The representation vector learned by the PADCN model was then passed into the downstream dynamic feature model to predict the fullrange mechanical responses of different structures. 8.5. Summary of AI modeling To better clarify the general methodology of AI-based computational analysis in civil engineering, the processes of creating and validating AI models can be summarized as follows: Data collection and preprocessing: Collect relevant data from various sources and preprocess it to remove noise and outliers and transform it into a suitable format for modeling. In our scenarios, static feature learning typically uses fixed-size vectors and structured tables, while dynamic feature learning should deal with sequences of variable lengths. 8.3. Dynamic feature learning The dynamic feature model in DeepSNA – named Mechanical Transformer (Mechformer) – was designed in line with the three char­ acteristics of the second branch described in Section 5.2. Based on the reference [114], the Seq2Seq framework with the attention mechanism was upgraded to the Transformer architecture [115], which featured better parallelization, as shown in Fig. 13(b). To address the large memory cost brought about by the standard attention mechanism in long-sequence cases, the Fast Attention via Positive Orthogonal Random Features (FAVOR+) algorithm [145] was utilized instead, reducing the space and time complexity from O(L2) to O(L). In the decoder, a GRU was adopted to naturally realize the causal generation of target re­ sponses. The global memory information was extracted by the encoder and concatenated with the outputs derived from the first deep GRU layer. In this manner, the history dependence effect was augmented, alleviating the memory fading problem of GRU in long-sequence cases. By aggregating the PADCN and Mechformer, DeepSNA could implement joint training for both models in an end-to-end manner. Therefore, DeepSNA realized an entire pipeline from the raw data inputs to full-range mechanical response predictions for arbitrary materials or structures, forming a computational framework in civil engineering. (1) Feature selection and engineering: Select relevant features from the preprocessed data and engineer new features to improve the model’s performance. (2) Model selection and training: Select a suitable machine learning or deep learning algorithm and train the model on the pre­ processed and engineered data. For pure static feature studies, classic machine learning and deep learning algorithms such as ANN, SVM, and boosting are commonly used. For static feature representation learning or dynamic feature prediction, complex deep learning models such as RNN and CNN are often preferred to capture the temporal dependencies and non-linear relationships. (3) Hyperparameter tuning: Once the model is trained, tune its hyperparameters such as the number of layers in neural networks and the learning rate set in the optimizer to optimize its perfor­ mance on a validation set. (4) Model evaluation: Evaluate the model’s performance on a sepa­ rate test set to determine its accuracy, precision, recall, or other metrics according to the problem. For most mechanical response prediction tasks, regression loss functions such as the mean ab­ solute error (MAE, e.g., L1 loss) and mean squared error (MSE, e. g., L2 loss) are commonly used to directly assess the performance of the model on the evaluation set and test set. (5) Deployment and monitoring: Once the model is validated, deploy it in a production environment and monitor its performance over time to ensure that it continues to perform well. 8.4. Performance of DeepSNA To demonstrate the performance of DeepSNA in comparison with conventional numerical methods, a numerical experiment based on SPSW structures was performed. The data were collected from historical literature and FE models and further extended by data augmentation algorithms [143]. The Adam optimizer [146] was used with a tri-step learning rate schedule. Fig. 14 presents the results obtained on the test dataset [147–149]. DeepSNA reproduced the highly nonlinear hysteretic responses of different SPSW structures, capturing the cyclic hardening induced by the strain range dependence effect, the breathing effect induced by the cy­ clic loading/unloading of shear bands, and the strength and stiffness degradation induced by the damage under large deformations. It was noteworthy that the training set contained stiffened SPSWs and perfo­ rated SPSWs but did not have specimens with the combination of these two constructions. However, as shown in Fig. 14(c), DeepSNA general­ ized to predict the response of specimen SPSW-1, which was a stiffened perforated SPSW (illustrated in Fig. 15). Therefore, DeepSNA was able to discover the underlying coupling mechanisms between different con­ struction details, exhibiting reasonable generalization capability. Fig. 14 also shows the comparison of the performance of DeepSNA and the conventional FE method. DeepSNA acquired more accurate results than FEA, especially for specimens that experienced strong geometric nonlinearity and strength softening. Moreover, in contrast with the conventional FE method that took hours to simulate only one specimen, DeepSNA predicted the responses of 16 specimens (i.e., the batch size of the test set) in less than 10 s without formal deployment, achieving a computational efficiency enhancement of at least 1000 times. Therefore, DeepSNA was capable of predicting the full-range re­ sponses of different materials or structures and was a concrete example of composite feature learning. This example also demonstrated the exceptional performance of AI models compared with that of conven­ tional FE methods, exhibiting far greater computational efficiency with high accuracy. These steps are typically repeated multiple times with different variations of the data, features, models, and hyperparameters to find the best-performing model or the model that achieves the engineering requirements. 9. Open problems As demonstrated by the reviews, AI-based computational analysis techniques have made significant progress in many explorative sce­ narios in civil engineering. However, it is important to recognize that there is still a considerable gap between current achievements and their practical application in engineering. In order to help bridge this gap, this section highlights four open problems from a practical perspective that need to be addressed to facilitate the implementation of academic research in engineering applications. 9.1. Few-shot and incomplete-shot learning The foundation of AI technology lies in big data. However, in civil engineering, due to historical and realistic factors, the data obtained from vast experimental studies and site investigations lack a systematic collection, resulting in a deficiency of benchmark datasets. Furthermore, due to the diversity and updating of materials and structures, it is challenging for a dataset to cover all parameters. Therefore, developing few-shot and incomplete-shot learning methods in civil engineering is essential. These methods are instrumental in exploiting the full power of large-scale intelligent models from a limited amount of data and enhancing their generalization capabilities. 12 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 Fig. 14. Comparison between DeepSNA and FEA [143]. 13 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 Fig. 15. The generalization of DeepSNA [143]. achieve high performance on a range of downstream tasks. This "pre­ training and fine-tuning" approach has been successful in computer vision and natural language processing. However, developing largescale pretrained models for civil engineering faces significant chal­ lenges, such as designing pretrained objectives, learning latent knowl­ edge across structures with different mechanical behaviors, and collecting appropriate unlabeled data. Despite these challenges, large pretrained models hold considerable promise for civil engineering ap­ plications, as they could reduce the need for costly experiments and speed up the development of new engineering solutions. 9.2. High-fidelity representation of complex structural systems The analysis of structural systems is the focal point of engineering applications. While the studies reviewed in this paper have made considerable progress in analyzing regular structural systems such as frame structures, which are relatively easy to digitalize using simplified data structures, the representation of more complex structural systems remains a key challenge. Unlike construction materials and individual structural members, structural systems exhibit a high degree of topo­ logical diversity [150] and include a variety of member configurations that must be considered in the analysis. The complete description of a structural system cannot be organized into ordinary linear data struc­ tures, such as vectors, grids, or sequences. Therefore, developing high-fidelity representations of complex structural systems is crucial for enabling accurate analysis and prediction using AI models and advancing their practical application in engineering. 10. Conclusions Over the past few years, new-generation AI technologies, repre­ sented by ML and DL, have emerged as promising tools for the compu­ tational analysis of materials and structures in civil engineering. This review paper aims to assess the current progress in this emerging field, highlighting both state-of-the-art achievements and future challenges. The main conclusions can be summarized as follows. 9.3. Physical interpretability Civil engineering is based on physical principles, and traditional numerical methods strictly adhere to mechanical laws and equations, making their computational results easy to understand and interpret [151]. In contrast, many AI models, especially deep neural networks, are often criticized for their black-box nature, with complex and opaque internal workings that make it difficult to understand how they arrive at their predictions. In engineering applications, where safety is of utmost importance, this lack of interpretability is unacceptable. Therefore, exploring physically interpretable AI models is indispensable in civil engineering to ensure the theoretical correctness of computational re­ sults. Such models would enable engineers to understand how the AI yields its predictions and make necessary corrections or modifications to improve safety and reliability. (1) The introduction of AI in computational analysis of civil engi­ neering is motivated by the fact that most traditional computa­ tional models rely on phenomenological regression, which can be replaced by AI algorithms to improve their expressiveness. (2) AI-based computational analysis in civil engineering can be classified into three major directions based on input features: static feature studies, dynamic feature studies, and composite feature studies. The difficulty and complexity of the popular al­ gorithms used in these categories increase in turn, while the number of studies decreases. (3) Static feature studies use AI models to predict scalar mechanical properties based on intrinsic material or structural parameters. Dynamic feature studies aim to predict future responses through past responses or simulate full-range responses through sequence learning. Composite feature studies use AI models to predict the key points of artificial constitutive models, which are then used to simulate the full-range responses of different materials or structures. (4) Current progress is limited by insufficient consideration of the data side and the lack of end-to-end composite feature learning. An example is highlighted to address these limitations and to demonstrate the exceptional performance of AI models in terms 9.4. Large pretrained models in civil engineering Most current AI models in civil engineering are task-specific, requiring a large amount of labeled data to be trained from scratch. This data is typically obtained through costly experiments or finite element analysis, which involves a significant amount of manual work. In contrast, large pretrained models leverage unsupervised or selfsupervised learning paradigms that require only unlabeled data. These models can be quickly fine-tuned with a small amount of labeled data to 14 C. Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 Table A1 Literature list for the review. App. level Static feature studies Construction material level Structural member level Structural member level Structural member level Ref. Year Prediction target AI algorithms [106] [152] [153] [154] [155] [156] [107] [108] [157] [158] [159] [160] [161] [162] [163] [72] [73] [74] [75] [76] [77] [78] [79] [81] [82] [83] [164] [165] [166] [80] [167] [168] [169] [170] [171] [172] [173] [174] [175] [176] [84] [85] 1997 2008 2009 2010 2011 2012 2013 2013 2013 2013 2013 2014 2015 2017 2017 2018 2018 2018 2019 2019 2020 2020 2021 2021 2021 2021 2021 2021 2021 2021 2022 2006 2010 2012 2013 2014 2014 2014 2016 2017 2018 2018 Compressive strength of concrete Elastic modulus of normal/high-performance concrete (HPC) Steel-concrete bond strength Compressive strength of no-slump concrete Uniaxial compressive strength of jet grouting materials Bond strength of spliced steel bars in concrete Compressive strength of HPC Splitting tensile strength of concrete Elastic modulus of recycled aggregate concrete Rapid chloride permeability of self-consolidating concrete Drying shrinkage of concrete Compressive strength of HPC Bond strength of GFRP bars in concrete Compressive strength of NC and HPC Compressive strength of concrete Compressive strength of silica fume concrete Strength of concrete containing agricultural and construction wastes Compressive and tensile strength of HPC Dynamic increase factor for SFRC Mechanical properties of composites Compressive strength of concrete Compressive strength of HPC Bond strength of near-surface-mounted FRP bonded to concrete Compressive strength of rubber concrete CFRP-steel bond strength Compressive and flexural strength of SFRC Post-cracking tensile strength of fiber-reinforced concrete Ultimate strength of FRP-confined concrete Compressive and tensile strength of HPC Compressive strength of recycled aggregate concrete Mechanical properties of composite laminate Shear strength of SFRC beams Compressive strength of FRP-confined concrete columns Buckling and post-buckling loads of compression members Failure mode, shear strength and deformation capacity of infilled walls Compressive strength and strain of FRP-confined columns Shear strength of FRP-reinforced concrete flexural members without stirrups Shear strength of RC beam-column joints Punching shear capacity of FRP-reinforced concrete slabs Compressive strength of FRP-confined concrete circular columns Shear resistance of FRP bars-reinforced concrete beams Failure mode and shear strength of RC beam-column joints [177] [178] [179] [86] [180] [87] [181] [88] [105] [182] [99] [183] [184] [89] [185] [90] [186] [187] [188] [91] [189] [92] [93] [190] [191] 2018 2018 2019 2019 2019 2019 2019 2019 2019 2019 2019 2020 2020 2020 2020 2020 2020 2020 2020 2021 2021 2021 2021 2021 2021 Shear strength of SFRC beams Shear strength of squat RC shear walls Punching shear capacity of SFRC slabs Load-carrying capacity and mode failure of beam-column joint Failure mode of circular RC bridge columns Thermal and structural response of RC members Axial compression capacity of SCFST columns Shear strength of steel fiber-unconfined RC beams Shear strength of SFRC beams Failure modes of ductile and non-ductile concrete joints In-plane failure modes of infilled RC walls Seismic failure mode identification of RC shear walls Failure mode and bearing capacity of RC columns Shear capacity of one-way slabs under concentrated loads Failure mode and shear capacity of UHPC beams Shear capacity of deep RC beams Shear strength of internal RC beam-column joints Shear strength of SFRCB without stirrups Axial compression capacity of circular CFST with UHPC Plastic hinge length of RC columns Punching shear strength of flat RC slabs without transverse reinforcement Buckling load of fiber-steering composite cylinders Strength of CFST columns under concentric loading Plastic hinge of rectangular RC columns Failure mode of beam-column joints [192] [193] [194] [195] 2021 2021 2021 2021 Loading capacity of RC shear walls Shear strength of SFRC beams Shear strength of RC deep beams with/without web reinforcements Shear capacity of slender RC structures with steel fibers ANN ANN ANN ANN SVM ANN ANN, boosting, bagging SVM ANN ANN, LNR ANN ANN, SVM, DT, LR, bagging ANN DT Deep restricted Boltzmann machine ANN ANN ANN RF CNN boosting Genetic programming, boosting bagging ANN ANN, SVM, DT, boosting, bagging KNN, LNR, SVM, ANN, boosting ANN SVM SVM, ANN, boosting ANN, SVM ANN ANN ANN ANN ANN ANN ANN LNR, symbolic regression SVM ANN ANN LR, LNR, KNN, Naïve Bayes, SVM, DT, bagging SVM ANN LNR, ANN Extreme learning machine KNN, DT, Naïve Bayes, ANN, bagging ANN ANN SVM multi-expression programming DT DT, LR, ANN, RF, SVM, boosting Naïve Bayes, KNN, DT, bagging, boosting boosting ANN SVM, ANN, genetic programming, KNN SVM, ANN, boosting boosting SVM ANN boosting LNR, SVM, DT, KNN, bagging, boosting DT, LNR, ANN, bagging boosting SVM, bagging, boosting KNN, LR, SVM, ANN, Naïve Bayes, DT, bagging, boosting ANN LNR, DT, SVM, KNN, ANN, bagging, boosting bagging, boosting bagging, Gaussian process regression 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Wang et al. Journal of Industrial Information Integration 33 (2023) 100470 Table A1 (continued ) App. level Structural system level Structural system level Ref. Year Prediction target AI algorithms [196] [197] 2021 2021 Load-carrying capacity of FRP-RC columns Failure mode of steel column base plate connection [198] 2021 Structural performance under fire [199] [94] [192] [200] [201] [202] [203] [204] [205] [206] [95] [96] [207] 2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2022 2022 2022 Shear capacity of squat flanged RC walls Ultimate strength of CFCFST Lateral loads of RC shear walls Axial compressive capacity of CCFST columns Failure mode of RC columns Shear strength of squat RC walls Shear strength of RC shear walls Load capacity of shear walls Shear capacity of FRP reinforced concrete members Axial load capacity of rectangular CFST columns Axial compression of rectangular CFST columns Shear strength of FRP reinforced concrete members Seismic failure mode of RC shear walls [208] 2022 Failure modes, strength, and deformation capacity of RC shear walls [209] [210] [97] [211] [98] [212] [213] 2009 2010 2017 2018 2019 2019 2020 [100] [101] [102] [103] [214] [215] [216] [217] [218] [219] [220] [221] 2021 2021 2021 2021 2021 2021 2022 2022 2022 2022 2022 2022 Damage indices of 2D RC frames Global drift capacities of RC frames Maximum interstorey drift ratio of RC frames Maximum interstorey drift ratio of RC frames Peak story drift ratios of RC frame buildings Maximum interstorey drift ratio of RC frame buildings Maximum interstory drift ratio and maximum displacement of a planar RC building structure under earthquakes Maximum story drift and collapse status of RC frame buildings Seismic drift demands of steel special moment resisting frames Non-linear buckling load of imperfect reticulated shells Maximum drift of RC frames Fundamental time period of masonry infilled RC frames Seismic drift responses of planar steel moment frames Limit state index of existing RC structures A multidimensional limit state function of RC buildings Shear force, bending moment and section curvature ductility of tall pier bridges Two damage indices of RC frames Collapse fragility curve of steel moment-frame buildings Drift, velocity and acceleration of RC frame buildings with soft/weak story boosting SVM, Naïve Bayes, KNN, DT, bagging, boosting DT, bagging, boosting, Deep residual neural network ANN SVM, ANN ANN boosting ANN, DT boosting ANN SVR SVR ANN ANN, Gaussian process regression ANN Naïve Bayes, KNN, LR, SVM, DT, ANN, bagging, boosting LR, NB, SVM, DT, KNN, ANN, boosting, bagging ANN ANN ANN ANN SVM ANN ANN Naïve Bayes, KNN, DT, bagging, boosting bagging SVM LNR, SVM, KNN, bagging, boosting ANN, LNR, SVM, KNN, DT, bagging, boosting ANN, boosting ANN ANN ANN, LSTM LNR, DT, boosting, KNN, ANN boosting ANN 2006 2007 2019 2019 2020 2020 2021 2021 2022 2022 2022 2022 2005 2007 2011 2012 2019 2019 2019 2019 2020 2020 2020 2021 2021 2021 2021 2021 2021 2022 2022 2022 2022 Time-dependent behavior of concrete Multi-axial constitutive models for FRP composites Constitutive model for Perzyna viscoplasticity Plasticity constitutive laws for aluminum alloy Anisotropic Yld2000–2d model Constitutive model for BLY160 steel Constitutive laws of fiber-reinforced composites Elastoplastic behavior for J2-plasticity Constitutive models for concrete and steel Elasto-plastic deformation behavior of 3D-foam structures Constitutive laws of composites Lifetime under low-cycle fatigue and thermo-mechanical fatigue loading Earthquake responses of high-rise building structures Dynamic response of slender marine structures Dynamic response of a simplified wind turbine Seismic response of a 2-story RC building Nonlinear time analyses of a single-DOF structure Nonlinear structural response modeling of specific structures Elasto-plastic response of a structure Wind-induced responses of a tall building Seismic response of sample structures Seismic displacement responses of a RC building Seismic response of a 3-story moment resisting frame Nonlinear seismic responses of a subway station Seismic responses of a building Nonlinear response of an engineering structure Wind-induced dynamic response of a transmission tower-line system Dynamic strain of a structure under stimuli Seismic responses of a building Nonlinear seismic response of a frame structure Structural response under seismic excitations Hysteretic response of a brace structure under different loading protocols Damage states with regards to different ground motion time histories ANN ANN LSTM GRU GRU Seq2Seq, attention mechanism ANN ANN Temporal CNN ANN ANN ANN, LSTM, GRU ANN ANN ANN ANN CNN LSTM LSTM CNN CNN CNN LSTM LSTM, CNN LSTM, CNN ANN, Monte Carlo LSTM CNN CNN LSTM Seq2Seq, attention mechanism Transformer LSTM, CNN Dynamic feature studies Construction material [116] level [222] [117] [223] [119] [114] [224] [225] [121] [226] [227] [122] Structural System level [135] [228] [123] [124] [125] [229] [126] [230] [127] [128] [231] [129] [130] [232] [233] [234] [235] [132] [236] [237] [238] (continued on next page) 16 C. 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Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Data availability Data will be made available on request. Acknowledgement The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant No. 52293433, 52121005), the China National Postdoctoral Program for Innovative Talents (Award No. BX20220177) and the China Post­ doctoral Science Foundation (Grant No. 2022M711864). Appendix: Literature list for the review For the convenience of readers, we have included a comprehensive list of all the collected papers reviewed in this paper in Table A1. References [1] H. Zhang, Q.L. Qi, F. Tao, A multi-scale modeling method for digital twin shopfloor, J. Manuf. Syst. 62 (2022) 417–428, https://doi.org/10.1016/j. jmsy.2021.12.011. [2] W. Wang, H. Guo, X. Li, S. Tang, Y. Li, L. Xie, Z. 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