Industry Foundation Classes (IFC) - IFC IFC Based Software Development of IFC Based Software

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Industry Foundation Classes (IFC)-IFCIFC
Based SoftwareDevelopment of IFC Based Software

• Kaj A. Jørgensen
• kaj_at_m-tech.aau.dk
• www.kaj.person.aau.dk

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Industry Foundation Classes (IFC)

• Standardised format for product data exchange
• IFC file Part 21 ISO 10303 (Step)
• XML file ifcXML
• Data Model for representation of building models
  new IFC4
• Object-oriented data model
• Generalised representation
• Building components
• Actors and resources
• Activities
• Properties and property sets
• Large number of structures
• Large variety of models can be represented
• Geometry is the primary basis

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The Interoperability Pyramid
Specifications
View Definitions
Deployment/Business
Implementations
Interoperability Know-How
Jiri Hietanen, Finland BLIS Project
http//www.blis-project.org
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Certification of IFC Based Software

• Software Applications Import/Export (P21 of
  IFCXML)
• Import model from file, e.g. for viewing, listing
  or calc.
• Export model to file, e.g. modelling tools from
  native repr.
• Import and Export, e.g. simulation apps., model
  servers
• Complete model or partial model?
• Model View Definition (MVD) (www.buildingsmart-tec
  h.org)
• Defines a subset of the IFC data model
• bS IFC2x3 Coordination View Version 2.0
• Certified (export) Revit Arch., ArchiCAD,
  Allplan, Scia Eng.
• Many others in progress (export and import)
• Other MVDs Structural, FM Handover, COBie (FM),
  etc.

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IFC Based Software

• Overviews
• www.buildingsmart-tech.org/implementation/ (gt150)
• www.ifcwiki.org/
• www.openbimforum.dk/ - ny dansk side
• Categories
• Commercial software
• Freeware, e.g. many viewers
• Open Source software, e.g. BIMserver from TNO
• Development platforms
• Toolboxes for different programming languages
• Application Programming Interfaces (APIs)

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Quantity Take-Off
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Base Quantities in IFC
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Vico Software Many calculated properties
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Quantity Take off and Cost Estimation

• Example wall with openings (doors and windows)

• Quantities
• Length
• Height
• Thickness
• Gross volume
• Net volume
• Gross area
• Net area
• Length of wall connections
• Opening width
• Opening height
• Length of opening circumference

Materials of each layer Activities/jobs Scaffoldin
g Etc.
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Modellering for Drift og Vedligeholdelse
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Representation of a Building in a Model
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Building Modelling Stepwise Detailing

• Example 1
• Wall
• Opening
• Window
• Example 2
• Building
• Storey
• Space
• Hierarchy
• Hierarchical
• Relationships

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Hierarchical and Cross-Going Relationships

• Example
• Space
• Surrounding
• Walls

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System Object Relationships

• Example 1
• Heating System
• Pipes
• Fittings
• Radiator
• Terminals
• Boiler
• Example 2
• Electric System
• Wires
• Switches
• Plugs
• Lights

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Building Model and Production Model

• Assembly Structure and Activities

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EXPRESS Language - Example

• ENTITY IfcProduct
• ABSTRACT SUPERTYPE OF (IfcElement,
  IfcSpatialStructureElement, ... IfcProxy)
• SUBTYPE OF ( IfcObject)
• ObjectPlacement OPTIONAL
  IfcObjectPlacement
• Representation OPTIONAL
  IfcProductRepresentation
• INVERSE
• ReferencedBy SET OF IfcRelAssignsToProduc
  t FOR RelatingProduct
• WHERE
• WR1 (EXISTS(Representation) AND
  EXISTS(ObjectPlacement)) OR
• (EXISTS(Representation) AND
• (NOT('IFCREPRESENTATIONRESOURCE.IFCPRODUCTDEFIN
  ITIONSHAPE' IN
• TYPEOF(Representation)))) OR
  (NOT(EXISTS(Representation)))
• END_ENTITY

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Industrial Foundation Classes
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