51 organization was named the International Alliance for Interoperability (IAI). Currently, the two main standardized building product data models are the following (Eastman, Teicholz, Sacks, Liston, 2008): Industry Foundation Classes (IFC) used for building planning, design, construction and management; CIMsteel Integration Standard Version 2 (CIS/2) used for structural steel engineering and fabrication. Both IFC and CIS/2 include data about geometry, relations, processes and materials, performance, fabrication and other properties needed for design and construction. These are neutral information models and can be created using applications that support the IFC standard. 4.3 Implementation of BIM
67 companies who do not have in-house 3D modeling capability are soon forced to subcontract that service. Finally, the multitude of BIM software creates a requirement to translate between the different file formats and this can results in lost data that has to be manually corrected. Fortunately the steel software industry has adopted the CIMsteel Integration Standards, which enable different software to export engineering data from one application and import it into another. The problem is more serious with less known software, which might use a proprietary file format. The following table sums up the main impacts that 3D and BIM had on the design, fabrication and construction of the Seattle Central Library and the Denver Art Museum. Table No. 2. Impacts of BIM and 3D.
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