Continuing our introduction to BIM and its related concepts, yesterday we discussed the idea of BIM IPD. Today, we will focus on BuildingSMART and introduce key concepts such as IFC:
1. BuildingSMART
BuildingSMART is an international standards organization, originally founded in 1995 as the International Alliance for Interoperability (IAI). In 2001, it was renamed BuildingSMART. The organization consists mainly of architects, professional designers, builders, software vendors, and material manufacturers, with most members based in Europe. BuildingSMART is dedicated to developing and promoting international standards that ensure consistent methods for exchanging and sharing building information. This improves efficiency and reduces data duplication. Its main achievement is the successful development and promotion of data exchange standards that enable interoperability between BIM models from different vendors, with the most well-known standard being IFC.
2. IFC
IFC (Industry Foundation Class) is a data format developed by the international organization IAI. Just as English serves as a universal language, IFC is an open, neutral, and free format designed to describe digital models of engineering projects, especially architecture. For example, a document can be saved as paper.doc, while a BIM model can be saved as mymodel.ifc and shared with others for use. IFC files are plain text, making them easy to open and interpret with various software tools. For instance, quantity data can be extracted by reading specific information from an IFC file generated by a BIM model. Currently, IFC is widely recognized as a metadata standard for exchanging data between BIM software from different vendors. IFC is still evolving and will eventually cover BIM model definitions beyond construction projects, such as bridges.
3. LOD
LOD (Level of Detail or Level of Development) refers to the degree of refinement in a BIM model. The term was introduced by the American Institute of Architects (AIA) and is traditionally divided into five levels: LOD 100, 200, 300, 400, and 500. These correspond to various stages of a construction project: LOD 100 represents a conceptual model, LOD 200 an analytical or basic design model, LOD 300 a detailed design model, LOD 400 a construction model, and LOD 500 a completed model. Recently, some have proposed adding a level 350 to represent the coordinated results of detailed design models during construction.
4. Collision Check
One of the most practical applications after creating a BIM model is performing collision detection, also known as clash detection. Since BIM models consist of physical entities, they can accurately calculate occupied space in three dimensions. When components from one system (e.g., structural beams and columns) clash with components from another system (e.g., fire sprinkler pipes), design adjustments are necessary, such as creating openings or rerouting pipes.
5. BIM Project Execution Plan
The BIM Project Execution Plan (BIM PxP) is a key document that guides the decision to implement BIM in a project. It should be prepared by the BIM contractor and clearly outline the objectives, scope of work, team organization, project delivery, delivery methods, and other practical aspects of BIM implementation. The earliest internationally recognized BIM Project Execution Plan template was developed by Pennsylvania State University in 2009 under the sponsorship of the American General Contractors Association (AGC). This template has since been updated and is now available in its second edition.
After two days of introducing BIM and related terms, I hope everyone now has a solid understanding of BIM and its associated concepts. Through these explanations, you should have gained a more comprehensive insight into BIM.
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