ANALYSIS AND DESIGN OF
PRESTRESSED CONCRETE BRIDGE
(A Case Study of Oyun River along Tanke-Yakuba)
By
Dauda, A. Y.
(10/30GB105)
PROJECT SUPERVISOR: DR. S.A. RAJI
July, 2014
The aim of this project is to analyze and design a prestressed concrete bridge to
link Tanke F division area with Apata Yakuba in Ilorin. The specific objectives
used in achieving this are;
 Obtaining measurement for the width and depth of the river
 Determining the reactions at the bridge support, stresses on girders and walls,
and deformation on the bridge using Midas CIVIL engineering software
SCOPE AND LIMITATION
This project focuses on analysing and designing a prestressed concrete
bridge. The project is limited to the modeling, detailed analyses and design
of the bridge with Computer Aided Design software (MIDASCivil) and
comparing results with that obtained from the manual analysis of a major
girder of the bridge..
INTRODUCTION
A bridge is a structure erected to span natural or artificial obstacles, such as
rivers, highways, or railroads, and supporting a footpath or roadway for
pedestrian, highway, or rail road traffic. A number of different methods
may be used to classify bridges. Bridges can be classified according to
materials (concrete, steel, or wood), usage (pedestrian, highway, or
railroad), span (short, medium, or long), or structural form (slab, girder,
truss, arch, suspension, or cable-stayed).
METHODOLOGY
Modeling of the bridge
Computer aided analysis of the bridge
Computation of reactions, stresses and
deformations on the bridge using Midas CIVIL
engineering software
Manual Analysis of the bridge to serve as a
check
COMPUTER MODELLING PROCEDURE USING MIDAS
CIVIL
RESULT & DISCUSSION
From manual and MIDAS calculations

The stresses in girder (No 895) are
LEVEL
MANUAL
MIDAS
1 BOTTOM
20.89𝑁/𝑚𝑚2
30.3𝑁/𝑚𝑚2
2 TOP
−1.2𝑁/𝑚𝑚2
−1.72𝑁/𝑚𝑚2
CONCLUSION
1.
Based on the results from both manual and computer
application, it can be concluded that the bridge girder (No 895) has
a stress of 20.89𝑁/𝑚𝑚2 (𝑡𝑒𝑛𝑠𝑖𝑙𝑒 𝑠𝑡𝑟𝑒𝑠𝑠) at the bottom of the beam
and −1.2𝑁/𝑚𝑚2 𝑐𝑜𝑚𝑝𝑟𝑒𝑠𝑠𝑖𝑣𝑒 𝑠𝑡𝑟𝑒𝑠𝑠 at the top of the beam from
the manual calculation while the computer aided analysis gave
30.3𝑁/𝑚𝑚2 (𝑡𝑒𝑛𝑠𝑖𝑙𝑒 𝑠𝑡𝑟𝑒𝑠𝑠)
at the bottom and −1.72𝑁/
𝑚𝑚2 𝑐𝑜𝑚𝑝𝑟𝑒𝑠𝑠𝑖𝑣𝑒 𝑠𝑡𝑟𝑒𝑠𝑠 at the top.
 2.
The use of the finite element method of analysis was
justified and the application of the MIDAS/ Civil software was found
to be time saving, less tiring and of higher accuracy compared with
rigorous manual method of analysis.

RECOMMENDATION

1.
It is recommended that the use of this software be treated
in broad term for all engineers due to its wide applications.

2.
More research should be carried out in the future on
better ways of structural modeling and analysis of bridge.
REFERENCE

Barker R. M and Puckett (2007). Design of highway bridges. John Wiley & Sons, Inc. Canada

Chen W.F. and Duan L. (2000). Bridge Engineering Handbook. CRC Press, Boca Raton, FL

Gurfinkel G. and Khachaturian N (1965). Ultimate design of prestressed concrete beams.
University of Illinois Bulletin, Volumn 62, Number 79

Jackson P. (2008). Design of reinforced concrete bridges. ICE Manual of Bridge Engineering

Knippers, J and Gabler, M (2006). New Design Concepts for Advanced Composite Bridges –
The Friedberg Bridge in Germany. IABSE Symposium pp. 16-23(8). International Association
for Bridge and Structural Engineering

Lai S.G. (1998). Guidelines for design of small bridges and culverts. Journal of the Indian
Roads Congress

Mekdam N, Nolan D, and Tony R (2010).Design and Construction of the Saint Albert Bridge.
Annual Conference of the Transportation Association of Canada. Nova Scotia