A COMPARISON OF REBAR QUANTITIES OBTAINED BY TRADITIONAL VS BIM-BASED METHODS
Keywords:
Building information modeling, quantity take-off, integer programmingAbstract
A quantity take-off is one of the most powerful functions of Building Information Modeling(BIM) software applications. This study focuses on a comparison of rebar quantities that are obtained from a traditional method and BIM software. Two case studies of extracting rebar from the footing component of building projects were explored. The traditional method was performed by manually counting and measuring the rebar quantities from the AutoCAD file while the BIM-based method was used Revit 2016 (student version) to model and extract rebar quantities. The result shows that the rebar quantities from the traditional method are 17.76% more than the BIM-based method. Furthermore, the integer programming technique was applied on optimization problems, which were formed from a bar cut list data, to obtain the exact number of the rebar. The finding shows that the exact quantities from the traditional method are 20.29% greater than the exact quantities while the rebar quantities from the BIM-based method are 1.11% less than the exact quantities.
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