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IFC-Based Definition of Geometry for Buildings

This article explores the use of IFC (Industry Foundation Classes) for representing and exchanging geometric data in the architecture, engineering, and construction industry. It discusses the need for interoperability, the mechanism of geometry exchange, and the IFC object data model. It also highlights the types of building elements and the challenges of geometry data exchange.

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IFC-Based Definition of Geometry for Buildings

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  1. IFC-Based Definition of Geometry for BuildingsDr. Vladimir BazjanacLawrence Berkeley National LaboratoryLeader, IAI Technical Advisory Group

  2. 2-D CAD: Professional Standard LBNL vb: 8/5/2000

  3. 2-D CAD: Professional Standard LBNL vb: 8/5/2000

  4. Future: 3-D CAD LBNL vb: 8/5/2000

  5. Types of Industry CAD Software LBNL vb: 8/5/2000

  6. CAD-Based Industry Applications • Who in the industry needs the acquisition of geometry? Virtually everyone! • architects • engineers (structural, mechanical, electrical, civil, fire protection, etc.) • cost estimators • contractors and builders • inspectors and code checkers • building operators/engineers • facility manageres LBNL vb: 8/5/2000

  7. Geometry Performance Needs • Dimensional • Perfect space enclosure LBNL vb: 8/5/2000

  8. Industry Need for Interoperability Future: all data available to everybody at all times LBNL vb: 8/5/2000

  9. The Mechanism of Geometry Exchange EXPRESS Definition Physical File Distributed (Interface) Client/Server SDAI Database Application LBNL vb: 8/5/2000

  10. Application Geometry Import/Export LBNL vb: 8/5/2000

  11. International Alliance for Interoperability • Mission: • To define, promote and publish specifications for the Industry Foundation Classes (IFC) as a basis for AEC Project information sharing through the project life cycle, globally, across disciplines and technical applications LBNL vb: 8/5/2000

  12. IFC Object Data Model Architecture Architecture Domain HVAC Domain FM Domain Construction Management Domain Shared Building Elements Shared Spatial Elements Shared Building Services Elements Shared Facilities Elements Shared Management Elements Product Extension Process Extension Modeling Aid Extension Utility Resource DateTime Resource Approval Resource Actor Resource Cost Resource External Reference Resource Measure Resource Material Resource Geometry Resource Geometric Model Resource Profile Resource Topology Resource Repres- entation Resource Property Resource Domain Layer Interop Layer Core & Extensions Layer Kernel Resource Layer LBNL vb: 8/5/2000

  13. The IFC Geometry Model LBNL vb: 8/5/2000

  14. IFC Views of Geometry • Bounding box • Attribute-driven • Solids LBNL vb: 8/5/2000

  15. STEP AP225: Types of Building Elements • Structure/enclosure elements • walls • beams • columns • slabs, etc. • Building services elements • Fixture equipment elements • doors, • windows, etc. • Spaces • Simple digital terrain model • planar faces as triangles LBNL vb: 8/5/2000

  16. *.ifc File LBNL vb: 8/5/2000

  17. Geometry Data Exchange Issues • File size • Interfaces to the IFC object data model • Middleware LBNL vb: 8/5/2000

  18. E+ Interoperable Environment LBNL vb: 8/5/2000

  19. Contact Information LBNL vb: 8/5/2000

  20. Thank you! Questions? LBNL vb: 8/5/2000

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