Evaluation of Material Estimation Performance in Government Construction Projects Using Building Information Modeling from SkethupBimTool

Abstract

Building information modeling (BIM) is a well-known as construction technology for creating and managing construction project information throughout the entire project. The objectives of this research are to apply BIM in quantifying construction materials, evaluating the results with the results from calculation of quantities according to the government work system based on price calculation criteria, and to identify the limitations of using BIM for extracting material quantities for public sector construction projects. By creating a virtual building model of a standard 2-storey office building of the Department of Provincial Administration designed by the Department of Public Works and Town & Country Planning using SketchUp Pro 2024 and SketchUpBimTool 1.5.8.4, which are add-ons for modeling, and then extracting the workload from the model. Then arrange for the model to report material quantity results. Compare the material quantity results report from BIM with the material quantity results calculated according to the price calculation criteria. The study found that the application of BIM in the structural work category is suitable for adapting to the quantifying construction materials of government construction projects. The amount of material of the structural work obtained from BIM is accurate and consistent with the construction drawings, with an error of only 0.86% to -6.22% from BOQ. But for architecture it is still not suitable and still needs to be developed to get better results. Because the quantity obtained from BIM has a tolerance of 23.76 % to -25.00%, it is considered high, but it is still less than the 30% criteria. The study also found that modeling technology has some limitations in architecture work. This is because the program's modeling process cannot be built like real construction in some materials. For example, the program cannot issue quantities in counting formats, and its need to create a new list of items separated by material in finishing work, etc. Overall, this research offers helpful information for public sector building experts who want to make the most of BIM.