Currently, BIM modeling standards in China lack uniformity. Due to the unique and complex nature of engineering projects, different modelers often apply their own habits and construction experience when creating BIM models. This inconsistency leads to challenges in ensuring model accuracy. Additionally, many issues arise during later stages of model application and project management, preventing the achievement of desired outcomes.
Modeling Fundamental Standards
(1) Units
Set the length unit in Revit modeling software to millimeters. The coordinate origin ±0.000 corresponds to the project drawing’s reference point. For civil (architectural and structural), installation, and steel structure engineering, coordinate origins should align with the elevation indicated in the design drawings.
(2) Spatial Coordinate System and Partitioning
The project’s design elevation ±0.000 represents the absolute elevation. Coordinate data must be planned and set uniformly, with clear project base points. Elevation and grid template files should be provided, and all professional BIM models built upon this standard template.
(3) Model Segmentation Principles
During the design phase, models should be split according to various professional disciplines or zones based on construction drawings. Model files are divided into building structure models (civil engineering), mechanical and electrical models (merged specialty models), and steel structure models.
During construction, models should be segmented according to workflow divisions defined by the project team. Application points should be separated based on the BIM model, with work sets split according to sub-item systems within each construction scope. Splitting within each sub-item system must remain consistent.
(4) Model File Naming Requirements
BIM model names should clearly represent project characteristics while distinguishing them from other projects. File names must be concise, easy to understand, and convenient for all personnel involved in modeling and application. Each model file should also include a version number to facilitate future verification and updates.
(5) Professional System Naming
Names for each professional component must be precise and consistent with design drawings to enable easy correlation and retrieval. Component names should indicate their profession and system affiliation, as well as relevant attributes such as specifications, categories, and dimensions.
(6) Model Material Definition
Assigning materials to components requires creating new materials, renaming component names, and copying graphical and appearance resources. It is essential to unify the names of component materials and appearance resources when building the model.
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