Advanced Building Information Modeling

Information Interoperability

Guest lecturer: Dr. Ling Ma

Virtual Construction Lab

Technion - Faculty of Civil and Environmental Engineering

Language

שלום

Data Classification & Definition (OmniClass)

Construction Information Development Committee

Information Definition

Orientation

Structural Performance

Many more ...

Function

From Information to Decision-making

Information Interoperability

Information Interoperability - IFC

Information Delivery

Industry Foundation Classes (IFC)

Domain layer

The highest layer includes schemas containing entity definitions that are specializations of products, processes or resources specific to a certain discipline, those definitions are typically utilized for intra-domain exchange and sharing of information.

Interoperability layer

The next layer includes schemas containing entity definitions that are specific to a general product, process or resource specialization used across several disciplines, those definitions are typically utilized for inter-domain exchange and sharing of construction information.

Core layer

The next layer includes the kernel schema and the core extension schemas, containing the most general entity definitions, all entities defined at the core layer, or above carry a globally unique id and optionally owner and history information.

Resource layer

The lowest layer includes all individual schemas containing resource definitions, those definitions do not include an globally unique identifier and shall not be used independently of a definition declared at a higher layer.

Industry Foundation Classes (IFC)

Schema Development - Express Language

Simple

Data Type

Aggregation

Data Type

LIST [?:?]

E.g. Coordinates:

LIST [1:3] OF REAL

Entity

Data Type

ENTITY IfcCartesianPoint

SUBTYPE OF (IfcPoint);

Coordinates : LIST [1:3] OF IfcLengthMeasure;

...

END_ENTITY;

Defined

Data Type

TYPE IfcLengthMeasure = REAL;

END_TYPE;

Entity Name
Supertype/Subtype
Attribute

Industry Foundation Classes (IFC)

ENTITY IfcPlacement

Location : IfcCartesianPoint;

...

END_ENTITY;

Schema Development - Express Language Exercise

How to model a Coordinates System

ENTITY IfcDirection

DirectionRatios : LIST [2:3] OF IfcReal;

...

END_ENTITY;

ENTITY IfcAxis2Placement3D

SUBTYPE OF (IfcPlacement);

Axis : OPTIONAL IfcDirection;

RefDirection : OPTIONAL IfcDirection;

...

END_ENTITY;

#902= IFCDIRECTION((1.,0.,0.));

#903= IFCDIRECTION((0.,1.,0.));

#901= IFCCARTESIANPOINT((0.,0.,0.));

#1001= IFCAXIS2PLACEMENT3D(#901,#902,#903);

Industry Foundation Classes (IFC)

Shape Representations ?

NURBS

Brep

Swept solid

CSG

Industry Foundation Classes (IFC)

Shape Representations - CSG

ENTITY IfcBlock
SUBTYPE OF (IfcCsgPrimitive3D);
XLength : IfcPositiveLengthMeasure;
YLength : IfcPositiveLengthMeasure;
ZLength : IfcPositiveLengthMeasure;
END_ENTITY;

#1022= IfcBlock(#1001,1000.,1000.,2000.);

ENTITY IfcCsgPrimitive3D
Position : IfcAxis2Placement3D;
...
END_ENTITY;

Modeling a block

#1001= IFCAXIS2PLACEMENT3D(#901,#902,#903);

Industry Foundation Classes (IFC)

Shape Representations - Swept Solid

Modeling a block

Industry Foundation Classes (IFC)

Shape Representations - Brep

Modeling a block

Information Exchange and Collaboration

Information Delivery Manual (IDM)
Model View Definition (MVD)
BIM Collaboration Format (BCF)
Construction Operations Building Information Exchange (COBie)

IDM & MVD

Business Process Model and Notation (BPMN)

Courtesy of Prof. Sacks

BCF

COBie Example

Example project from National Institute of Building Sciences

Summary

Information interoperability
- Why IFC
- How IFC works
Information exchange workflow
- IDM & MVD
- BCF
- COBie

Slides available at http://bit.ly/TechnionBIM

Enjoy BIM

Tutorial

Get the program and read ifc file according to online document
Sign up Trimble Connect account
Update user profile
Create a new project (choose EU server)
Invite team members including me : lingma@technion.ac.il
Download Revit plug-in and run Revit as administrator
Publish your project to Trimble, see this tutorial
- Check model tree & property sets
- Function panels & create views
- Create ToDo list + assign + comment + change status
- Clash detection
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