According to the industry standard “Digital Definition of Building Objects” JG/T198-2007 in China’s construction sector, BIM (Building Information Modeling) is defined as a data organization that encompasses systematic building information. This data can be quickly accessed and modified through corresponding computer applications.

Currently, the concept of BIM continues to evolve and expand. Its application has grown to cover the operation and management phases across the entire project lifecycle. Moreover, BIM use is no longer limited to construction alone; it has also been adopted in bridge engineering, landscape architecture, and municipal engineering projects.
BIM is categorized into five types, based on the different stages of application throughout a building’s lifecycle:
1. BIM 3D: The most basic form, focusing on creating building documents related to component materials. Unlike CAD 3D, BIM 3D breaks down buildings into functional components with specific physical attributes.
2. BIM 4D: Extends BIM 3D by incorporating the time dimension. Each component includes information about its construction and demolition dates.
3. BIM 5D: Adds cost information for each construction task, representing the fifth dimension of the BIM model.
4. BIM 6D: Involves energy analysis of buildings, constituting the sixth dimension of the BIM model.
5. BIM 7D: Focuses on building maintenance and usage management. Currently, no software fully implements this function.















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