The fundamental guidelines for modeling prefabricated buildings using Revit software are as follows:
1. Building Floor: After creating a level in a Revit project, the software will automatically select “Building Floor” in the level properties by default. If an auxiliary level is created and there is no need to export data for this level, make sure to uncheck this option. All elements on each level must be created from the plan view corresponding to that level; it is prohibited to use other levels with offsets to create models for different floors.
2. Grid: Every Revit project must include a grid, which can take any form but must be present.
3. Wall Structure: When drawing shear walls, infill walls, or interior partitions, confirm whether the “Structure” and “Structural Usage” options are selected in the structural properties according to the actual requirements. For non-structural interior partitions, the ‘structural’ parameter should be deselected.
4. Use Appropriate Families: Create elements using families that correspond to their category. For example, walls should be created using system family walls or customized families classified as walls in Revit. It is not allowed to use system family railings to model walls or roofs to simulate stacked floors. All Revit elements must align with their actual functional classification.
5. Project Structure: Each building corresponds to a single Revit project, with the building serving as the smallest unit within the project model.
Structural System Modeling
1. Prefabricated Columns: Model columns according to the exact design dimensions.
2. Prefabricated Shear Walls: All prefabricated walls must be cut based on the actual design requirements. For T-shaped or L-shaped walls, split the wall into multiple components to create separate parts.
3. Composite Panels: Unlike traditional floor modeling, composite panels require separating prefabricated and cast-in-place components. These cannot be combined using Revit components and must be represented as two distinct family instances.
4. Prefabricated Beams: When combined with composite panels, prefabricated and cast-in-place parts should be modeled separately.
Enclosure System Modeling
1. Prefabricated Concrete External Wall Panels: Due to their complex shapes, these are typically created as custom families using conventional metric models. The model should clearly indicate features such as ribs and window openings. Custom families must be classified as walls within Revit.
2. PCF Boards: These should be modeled separately from walls using system family walls, following the same principles as laminated panels. Openings for windows and doors must be clearly defined.
3. Prefabricated Balcony Partitions: These are modeled using system family walls and integrated with prefabricated shear walls. Composite walls should be created as separate components.
Interior System Modeling
1. Integrated Bathrooms and Kitchens: According to prefabrication rate calculation rules, the area for integrated bathrooms and kitchens is based on their floor projection. Therefore, their floor system families can be modeled directly in Revit.
2. Prefabricated Ceilings and Dry Flooring (Finished Flooring): These should be modeled using the built-in ceiling and floor system families available in Revit.
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