BIM Modelling Requirements and Collaboration Procedures

 

This section defines “how” BIM is to be created and shared throughout the project.

 BIM Modelling Requirements

Once the project members are aware of their deliverable at each stage of the project, there is also a need to set up modelling requirements to ensure modelling quality. The following requirements provide a minimum standard for BIM project implementation.

•  Modelling Guidelines for BIM Elements

A set of modelling guidelines for key BIM elements at different stages of a project can be found in Appendix B of this document. The modelling guidelines are grouped by Architectural, Structural and MEP disciplines in this version of the document. In general,

each element will be modeled according to its size, shape, location, orientation and quantity. At the early stages of the project, element properties are more generic and approximate, but become more specific and increases in accuracy as the project progresses.

•  Modelling Guidelines for Regulatory Submission

For BIM e-submission to regulatory agencies, additional modelling guidelines and templates for Architectural, Structural and MEP disciplines can be downloaded at http://www.corenet.gov.sg/integrated_submission /bim/BIMe_submission.htm

•  Model Division and Structure

Depending on the size of the building and / or the phasing for the project, it may be necessary to divide the model into separate building, zones and levels. This should be agreed and documented as early as possible.

• 3.1.4 Drawing & Documentation Production

Before the construction industry is ready to accept BIM as part of the contractual documents, there is a need for project members to agree on the standard for 2D drawings that form part of the contract documents. 2D drawings can either be derived directly or produced independently from the model, such as:

1.  Plans
2.  Sections
3.  Elevations
4.  Details
5.  RFIs

It is recommended to generate 2D drawings directly from the BIM model, to ensure there are no discrepancies. 2D drawings not produced from the BIM models should be clearly labelled as 2D-CAD files.

While the respective disciplines will maintain its drawing list, drawing numbering and sheet naming systems, a common naming convention of views, legends, schedules, sheets and links will provide a common reference to the corresponding 2D design drawings, tender drawings, working drawings and as-built drawings.

•  Publishing Formats

To ensure the life-cycle use of building information, information supporting common industry deliverable shall be provided in existing open standards, where available. For those contract deliverable whose open standard formats have not yet been finalized, the deliverable shall be provided in a mutually agreed format which allows the re-use of building information outside the context of the proprietary BIM software. The format could be any of the prevailing open standards, such as IFC, where available. The formats used should be specified in the BIM Execution Plan.

The Industry Foundation Classes (IFC) is an open BIM data format that is being offered as a neutral format supported by many software applications and utilities, thus supporting interoperability between users sharing files created, viewed and edited in different tools. More information about IFC and related model standards can be found at http://buildingsmart-tech.org/ .