Sr. Quek Jin Keat,

Chair of BIM Technical Committee, Quantity Surveying Division,

Royal Institution of Surveyors Malaysia (RISM);

Project Director, KPK Quantity Surveyors Sdn. Bhd.

BIM is a Modelling Technology and associated set of Processes to produce, communicate and analyse digital information models for construction life-cycle

- proposed definition by CIDB BIM

Steering Committee on 26 September

2013

DEFINITION OF BIM

This presentation consists of 5 parts:

Standards for BIM

Anomalies in Standards

RISMs approach for a BIM SMM

3D BIM-SMM conflicts

Conclusion

Standards for BIM

Anomalies in Standards

RISMs approach for a BIM SMM

3D BIM-SMM conflicts

Conclusion

Classification Of Standards

1. Standard for data/information exchange

or interoperability

2. Standard for design object library (in

Malaysia, PAM calls it the e-library)

3. Standardized naming convention for

Project identification, building types, etc.

4. Standardization of classes or elements

for spatial, functional, cost analysis, etc.

STANDARD BIM OBJECT LIBRARY

OMNICLASS ELEMENT GROUPING

STANDARDIZATION

OF CLASSES OR

ELEMENTS FOR

SPATIAL,

FUNCTIONAL,

COST ANALYSIS,

ETC.

Classification Of Standards (Contd)

5. Standardization of Method of Measurement

and Description of work items for BIM

6. Standardized Schedule of Rates of work

items for tender pricing

7. Standard format for embedding life cycle

costs for operations and maintenance

8. Standards to enable design modelling, and

5D BIM, that are software neutral (BIM Guide)

CAD design standard Measurement standard

9

CIC BIM PROTOCOL SINGAPORE BIM GUIDE

Standards for BIM

Anomalies in Standards

RISMs approach for a BIM SMM

3D BIM-SMM conflicts

Conclusion

Anomalies In Interoperability

Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM

interoperabilityinteroperabilityinteroperabilityinteroperability

ArchiCAD_OriginalElevation.JPG was exported to Revit to became RevitElevation.JPG

Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM

interoperability (continteroperability (continteroperability (continteroperability (contd)d)d)d)

In RevitElevation.JPG,

Doors & windows were missing

But the schedule lists them all with completely different names

Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM

interoperability (continteroperability (continteroperability (continteroperability (contd)d)d)d)

Exported IFC from Revit & re-import

to ArchiCAD as

ArchiCAD_RoundTripElevation.JPG

3D surfaces triangulated

Plans have different conventions

(no swings, slides, etc.)

Names have changed

Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM Actual anomalies with BIM

interoperability (continteroperability (continteroperability (continteroperability (contd)d)d)d)

Imported the original IFC exported

from ArchiCAD . (The untouched IFC

was imported back into ArchiCAD as OriginalArchiCADIFC_ImportedBackInt

oArchiCAD.JPG)

Doors & windows names changed

again

Plan & elevations are different too

A case of the same software not

talking to itself

Anomalies In Naming Convention

For Library Objects

I have enclosed an image of the door libraries from revit. Look at the naming convention. When you use these libraries, the parameters are different... And they all come from the same source. Archicad is better but it's still lacking a lot of commonly used objects.. Like 4-panel sliding doors. I don't see how anyone can do practically BIM without such standards sorted out.

- Ben Thum, 13 March 2013

18

No Standardisation,

repeated elements

19

Standards for BIM

Anomalies in Standards

RISMs approach for a BIM SMM

3D BIM-SMM conflicts

Conclusion

Engagement with private deveoper who

has implemented BIM and 5D BIM (work

schedule-prioritizing)

Understand how BIM object library is

linked via Uniformat to the SMM object

library

Identify conflicts in modelling with 3D

and the SMM

Standards for BIM

Anomalies in Standards

RISMs approach for a BIM SMM

3D BIM-SMM conflicts

Conclusion

Things To Bear In Mind:

BIM modelling is different from 2D CAD modelling. In BIM you model objects, not just draw lines. Different types/thicknesses of floor finishes must be modelled separately. You cant just annotate with descriptions to show the different types/thicknesses.

Modelling walls, plaster, paint & openings separately is a lot more work for the BIM modeller compared to drawing them in 2D CAD.

The BIM modeller and QS has to work side-by-side to ensure the success of 5D BIM rules of measurement need to be amended to suit the way the objects are modelled. It is not practical to model objects to suit the SMM.

Examples Of Conflicts:

GFA is to external face of wall contrary to RISM BCICs rules (which is to internal face).

The girth of the external wall is measured from centre-line. If you require the facade area, which is to the external face, you need to model separately.

BIM modeller will not model shop or fabrication drawings which require at least LOD 400.

Uniformat elements do not correspond exactly with the SMM there will be issues.

Examples Of Conflicts (Contd):

Since every element, part or component needs to be named & described, the process is tedious.

It is possible that up to 80% of measured items can be modelled in BIM. Trying to achieve a % higher than that will strain the BIM software. Bear in mind that BIM was created not for QS measurement but primarily for clash detection.

5% of measurable items will not be picked up from BIM model.

Labour items cant be modelled in BIM should be described in the Preambles instead.

Lintols can be modelled but they have to be measured as inclusive of formwork and rebar.

Examples Of Conflicts (Contd):

Windows in curtain walling are modelled under walls.

The vertical surfaces of a drop ceiling are measured as wall surfaces since ceiling surfaces are modelled as horizontal surfaces.

Voids where modelled are deducted regardless of the sizes. This is contrary to the SMM where voids less than certain sizes are not deducted.

It is possible to model formwork according to the various stages of heights as per the SMM but this will require a lot of work for the modeller who has to model all the various stages of heights.

Standards for BIM

Anomalies in Standards

RISMs approach for a BIM SMM

3D BIM-SMM conflicts

Conclusion

The BIM journey for RISM is filled with challenges such as:the standardization of naming conventions, unstructured or incomplete design object library,

lack of true interoperability, non-existent SMM library harmonized for BIM, lack of uniform coding system for both the design object and SMM library,

difficulty in linking pricing (unit rates) and FM into the BIM model, etc. RISM will need to find its way forward in 5D BIM as measurement for producing Bills of Quantities is still considered an important QS activity.

Although it is still early days to conclude

that RISM's collaboration with a private

developer has been successful, a start has

been made to streamline and simplify the

SMM2 to make it more BIM compliant.

The results achieved so far have been

quite encouraging as we are able to

appreciate the problems design modellers

faced.

Thank You!