9 december 2011

Government Buildings Agency mandates BIM

14 juni 2012

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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?

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Building Information Modelling

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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

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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

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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

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BIM in the Government Buildings Agency

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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

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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

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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

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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

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BIM – Functional specification

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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)

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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

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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

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First results

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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

20 18 april 2023

21 18 april 2023

22 18 april 2023

23 18 april 2023

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Challenges

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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

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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

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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

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Questions?