Government Buildings
Agency mandates BIM
9 december
2011
14
juni 2012
Subjects:
• Building Information Modelling: present
situation
• Importance of BIM for the Government
Buildings Agency
• Connection with functional specification
• First results: 3 models for Maincontracting
• Challenges for the supply chain
• Questions?
2
Building Information
Modelling
3
Our view of working with BIM:
• Central 3D model or combination of models
• All data needed in the proces of design,
construction and maintenance integrated in
the model
• Used by all parties in the proces
4
BIM applications and file formats
• Wide variety of BIM applications for
modelling and analysis of different aspects
• No strong international standards yet
• Exchange between BIM applications not
always reliable
5
Penetration in the Dutch building sector?
• In the past few years the use of BIM
applications by construction companies,
design offices and other parties has
seriously increased
• However, no mainstream yet: mostly ‘in
company’ use, incidental exchange between
parties
6
BIM in the Government
Buildings Agency
7
Motivation for Rgd BIM standard:
BIM fits Rgd’s decision to fully concentrate
on its role as public real estate procurer:
• Rgd needs building information to be in
control on individual buildings as well as the
entire building stock (7,000,000 m2)
• Diminishing inefficiency – especially in
maintenance and operation
8
Embedding in various types of contracts:
Best chances in long-term contracts for
maintenance (M):
• DBFMO: 8 contracts to be tendered from
2011 on
• Maincontracting maintenance: 3 pilot
contracts in 2012
• DBM: under development
9
Which requirements in BIM standard?
• All physical an spatial elements represented
in the model – in principle in 3D
• Functional specifications attached to this
representation
• All required building documentation and
information extracted from the model
10
Applications and file formats
• Contractor may choose any BIM application
or file format
• Extracted files in DWG (conventional plans,
sections) and IFC (3D model)
• Native format BIM files must also be
provided for development purposes
11
BIM – Functional
specification
12
Functions and requirements
• DBFMO, DBM, Maincontracting: contracts
based on functional specification
• Expressed in terms of functions and
requirements
• Functions and requirements stored in
database (Relatics)
13
14
15
BIM as a regular information service:
• Alterions to building reflected in the model
• Extracted documents up-to-date and
available at all times
• Extracted documents subject to monitoring
and payment mechanism
16
Rgd BIM standard is version 1.0 !
• First priority: getting BIM exchange to
actually work
• Experience leads to improved versions of
standard
• Further development of standard
communicated with organisations
representing the construction sector
• Rgd monitors the actual use BIM in the
supply chain + ICT developments
17
First results
18
Three models for maincontracting:
• Revit models commisioned by Rgd
• Based on as-built drawings + on site
verification and additional measurement
• Limited to construction and spatial elements
+ functional specifications (no MEP)
• Handover to maincontractor planned July
2012
19
20
13 april 2015
21
13 april 2015
22
13 april 2015
23
13 april 2015
Challenges
24
BIM applications and file formats
• Problem: future development of applications
uncertain – in particular with respect to
exchange between apllications
• Challenge: practical choices among present
applications and formats for maximum result
– keep a close eye on further developments
in BIM software
25
Information exchange between parties
• Problem: present culture of information
exchange still largely based on one-time
hand over of paper documents
• Challenge: start experimenting with
information requirements in long term
contracts, aiming at permanent
management and exchange of digital
information
26
Existing buildings in use
• Problem: existing information (esp.
drawings) often incomplete / inconsistent /
unreliable; disturbance of user proces not
allowed
• Challenge: efficient interpretation of existing
drawings and other documents
• Challenge: efficient application of techniques
for measuring and verification on site
27
Questions?
28