At present, the biggest controversy and doubt caused by the intervention of traditional contract models in the application of BIM operations, methods, or technologies generally revolve around the effectiveness of “views” and “calculations”. The collision between tradition and BIM often leaves people at a loss. Today, the author will talk to you about itWhat is the difference between views and computational complexity in BIM applications and traditional models?
1、 The relative relationship between 2D graphics and 3D simulations
2D graphics are intricate and complex, and those who can understand them know the relative relationships, who comes first and who comes later, and which chart or table to use, making it easy to achieve balance. And everyone can understand 3D, and software manufacturers have told us that we can directly pull the cursor on the computer view to capture dimensions, which makes it easy to compare the on-site construction results with the model, thus leading to the issue of the validity of the dimensions in 3D drawings. Of course, based on different modeling purposes and levels of refinement, some may have size specification effects, while others are only relative phase relationships. For example, the BIM pipeline and equipment simulation view in Figure 1 and the BIM simulation and color rendering in Figure 2 undoubtedly have higher configuration discrimination and recognition than traditional system diagrams. However, when formulating the principle of size validity for drawing surfaces, it is necessary to link the modeling method with the drawing description to explain the effectiveness basis of individual sizes, in order to avoid generalization. So, in the guidelines, it is appropriate to describe: “The units, volumes, and environments presented in 3D files or views are used to display the configuration effects of the constituent components, with relative spatial scale relationships, and unless otherwise specified in the contract, they have no absolute size effect.” This is closer to the description of the two figures above.
Figure 1 BIM pipeline and equipment simulation view
Figure 2 BIM simulation and color rendering
2、 Quantity estimation and measurement standards
In【BIM software】As long as there are examples of columns, walls, beams, slabs, doors, windows, pipes, valves, and equipment required for the project built internally (based on REVIT’s modeling unit system, which is structured by population, category, and type, and individual types grouped in the model are called examples), through software statistical counting or parameter extraction, real-time quantity reports can be dynamically generated. However, it must be deeply recognized that BIM software is not created in response to PCCES, so issues related to quantity estimation and measurement must be addressed, including whether there are component drawing principles that comply with measurement and pricing; What can be directly generated by BIM as a listing and pricing quantity that complies with current contract principles; Which object attributes must be extracted and analyzed through the program development functions provided by the software to achieve measurement value use; It is even necessary to adjust the method of engineering quantity allocation and pricing principles to link the relationship between physical components and virtual objects.
Okay, aboutWhat is the difference between views and computational complexity in BIM applications and traditional modelsThat’s all for everyone, I hope this article can help everyone!
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