BIM Object Libraries and their implications in the...

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"BIM Object Libraries and their

implications in the preparation of BQ

and estimating"

Eugene Seah

Deputy Chairman

Langdon & Seah Singapore

Assistant Professor (Adjunct), National University of Singapore

[email protected]

Two Papers

Seminar on

"Future-proofing

Quantity Surveying

- Meeting the BIM

Challenge Head-

on," 26 & 27

November 2012,

Kuala Lumpur

mailto:[email protected]

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BIM

Training

Deployment

In Co.

Legislation

Incentives

Interstate

www

Cloud

Clear

brief

Vendors’

services

Integrated

Definition

Vendors’

support

Project

Documentation

Client’s

Documentation

BIM

contents

Standard CP

/Framework

Open library

/cloud base

Sustainability

Technology

Climatic Change

Social & Recreation

Demographic Change

Globalisation

BEP

BIM

Training

Deployment

In Co.

Legislation

Incentives

Interstate

www

Cloud

Clear

brief

Vendors’

services

Integrated

Definition

Vendors’

support

Project

Documentation

Client’s

Documentation

BIM

contents

Standard CP

/Framework

Open library

/cloud base

BIP

BDP

R&D

BMM

Sustainability

Technology

Climatic Change

Social & Recreation

Demographic Change

Globalisation

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Analysis BEP

BIM

Training

Deployment

In Co.

Legislation

Incentives

Interstate

www

Cloud

Clear

brief

Vendors’

services

Integrated

Definition

Vendors’

support

Project

Documentation

Client’s

Documentation

BIM

contents

Standard CP

/Framework

Open library

/cloud base

Program

Simulation

Asset

Schedule

Cost

Software

BIP

BDP

R&D

BMM

Sustainability

Technology

Climatic Change

Social & Recreation

Demographic Change

Globalisation

Analysis BEP

BIM

Environment Social

Training

Deployment

In Co.

Legislation

Incentives

Interstate

www

Cloud

Clear

brief

Vendors’

services

Integrated

Definition

Vendors’

support

Project

Documentation

Client’s

Documentation

BIM

contents

Standard CP

/Framework

Open library

/cloud base

Business

Program

Simulation

Asset

Schedule

Cost

Software

BIP

BDP

R&D

BMM

Sustainability

Technology

Climatic Change

Social & Recreation

Demographic Change

Globalisation

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Analysis BEP

BIM

Environment Social

Training

Deployment

In Co.

Legislation

Incentives

Interstate

www

Cloud

Clear

brief

Vendors’

services

Integrated

Definition

Vendors’

support

Project

Documentation

Client’s

Documentation

BIM

contents

Standard CP

/Framework

Open library

/cloud base

Business

Program

Simulation

Asset

Schedule

Cost

Software

BIP

BDP

R&D

BMM

Sustainability

Technology

Climatic Change

Social & Recreation

Demographic Change

Globalisation

Global Construction Consultants

8 8

Outline - Object

What is Object (GUI + Database)

Shape provided by Vendors

Revit, Bentley, Graphisoft, Vectorworks, etc

Object Library Structure

Neutral Exchange IFC

Language IFD

Mapping IDM

FM COBie

buildingSMART QTO

US Omniclass,

Uniformat, Masterformat

Country Customisation

UK BCIS,

Rule of Measurement

Singapore

SS CP80, 97 and 93

Object-Linkable Quantities,

Calibrated add on;

4D Schedule

/5D Costing

Variations?

As built Final Account

• What

• How

• Issues

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Neutral database structure:

Industry Foundation Classes (IFC)

• http://www.buildingsmart-

tech.org/ifc/IFC2x4/rc4/html/index.htm

• Basic QTO were already coordinated.

http://www.buildingsmart-tech.org/ifc/IFC2x4/rc4/html/index.htm



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Source: NBS UK


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Source: NBS UK

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IDM for country based QTO

Country Based


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Attributes needed in stages

LOD100 LOD200 LOD300 LOD400 LOD500

Country Based

Country Based

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5D Budget Mgt Users

5D Cost Mgt Users

4D Time Mgt Users

6D FM User

Other support Analyses

Green Analysis

Functional Needs

4D Constructability

Buidability

Change Mgt

Attributes-Responsibility Matrix to Integrate BIM

LOD200

LOD100

LOD400

LOD300

LOD500


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Associate Classification to

Singapore Standard CP97 CEMS ID

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MEASUREMENT ITEMS

Information on Drawing Quality /General Conditions CLASSFICATION TABLE

MEASUREMENT RULES (IFC)

DEFINITION RULES

COVERAGE RULES

SUPPLEMENT RULES

Col.1 Col. 2 Col.3 Col.4 Unit /Description for Unit

Measurement

IFC measurement resource layers for e-measurement

Define sizes are nominal or effective

Items deemed included

Items linked to NPQS & other electronic info

exchange

Classification (CRCS /description)

Quality of material to Singapore Standards (SS)

Document Layer

Document Layer

Cost Treatments & Testing

Measure (m2, m3) Jointing & Fixing

Material Limits

Link to web based NPQS

Work Section

number Sub Heading

number Number from

column 1 Number from



column 4

e.g. 04000000: 0: 2. 2. 1. 1

Excavation Works - Excavation /Filling works

Foundation excavation

Pits for pile-caps, column or stanchion bases and the like

Commencing level stated

e.g. 20000000: 1: 1. 4. 1. 2

Ventilation, exhaust and air conditioning installation

Ventilation /Fume extract

Ventilation Dampers Type and size stated

Fire dampers

An asterisk within a cross reference represents all entries in the column in which it appears.

The digit 0 within a cross reference represents no entries in the column in which it appears.

CEMS cross reference ID:

e.g.

04000000: 0: 2. 2. 1. 1

21000000: 1: 1. 4. 1. 2

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Develop plug-in Drivers: IDMs

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Detailed Wall Types QTO

These are generic wall types

that have had the correct

Uniformat information

applied to them.

You can certainly use other

wall types, but these will

give you guidance about

what information is key to

this process.

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1

2

3


22 Similar minimum benchmarks on usability, functions, graphical user interface and data structure

2 or 3D

drawings

Layering console

Measurement Data manipulation

Exportable to a database/ Excel/ Access

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Package Assembler

1. Repackage the items to

suite the contractor’s

procurement style and

methods

2. Direct extraction from

the e-BQ, repackaged,

and sent directly to the

marketplace for RFQ

3. No need to fax

specifications, send

drawings etc

03000

03000

03000

03000


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03000

03000

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1

2

3

4 5


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Conceptual Quantity Takeoff with BIM- HOK/ LS Study

Currently, construction project facing following

challenges –

•Advance groundbreaking

•Compressed construction schedule

•Raw materials escalation

•Accurate forecast of construction cost

HOK generates conceptual quantity takeoff

information from the BIM model that can be

used to formulate a conceptual cost estimate.

The techniques and methods have been

developed in junction with the HOK

Construction Services Group.

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What is included in a conceptual estimate

To begin to construct a conceptual estimate

you must have a firm understanding of how it

is produced.

Because in this phase of a project the

variables are so great a small amount of

information is used to generate a large variety

of cost information.

•Functional Floor Area

•Building Skin Area

•Interior Wall Length (if applicable)

•Ratio of Solid vs Glass

•Ratio of External Wall to Construction

Floor area

•Construction Floor Area showing PES,

NFA and even efficiencies


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BIM building masses

Revit masses are very useful when a design is

in its very first stage of development. It

allows you to quickly create the building

form, and then easily count the quantity

information that has been generated from

the form.

This process also works with a mass imported

into a family from Rhino or other applications

that produce solid geometry.

Designer can balance between form seeking

& technical requirement, i.e. floor area.

What is

my total

floor

area?

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Taking Off Template

Revit gives us a number of ways to

count information about your design.

The key is to understand what

method is the most useful and

accurate for the stage of your project.

Several conceptual design quantity

takeoff (QTO) schedules are set up

for easy setup by design team.

These templates are to be discussed

with the Quantity Surveyor to

separate cost attributes into:

•Functional Areas

•Trades

•Elements

•Cost Centre (eg office tower,

residential tower etc)

Used when multiple

buildings are in project

Surface area is

calculated based on

each mass floor

Mass Floor Area


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B2010 – Surface Area

This value is calculated by the mass floors for

each level of the building. It is essentially

the surface area from one Mass Floor to the

one above.

This information is very useful regarding

conceptual QTO. However, this critical data

can be difficult to quantify with today's

creative architecture. BIM made these

available to both designer and cost

estimator with constant update as building

mass evolves.

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BIM wall by face

A twist on the Mass Floor only takeoff method

is one that uses the Wall by Face tool in

conjunction with the Mass Floors. This allows

you a higher level of control and allows you

to specify different construction types for the

different vertical surfaces in the project.

QTO-Exterior

QTO-Curtain Wall 2

QTO-Exterior - Below

QTO-Curtain Wall


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Mass it, Test it, & Evaluate it

OPT1

*Surface Area include the Roof Surface

OPT 2 OPT3

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Mass it, Test it, & Evaluate it

OPT 3 OPT 2

OPT 1


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Specification No Resource Information Cost Product Code


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$360,879.00

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Conclusions

• Establish IDM and Standards

• Agree on an open architecture

• Agree on function and use of the model

• Agree on information and attributes

Agree on a shared Database

• Complimented by agreed BIM processes


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Thank You

(Q & A) Eugene Seah

Deputy Chairman

Langdon & Seah Singapore

Assistant Professor (Adjunct), National University of Singapore

[email protected]

mailto:[email protected]

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