Resumen
In off-site construction, production of fabrication drawings has a very important impact on productivity. Documentation using 3D model is one of the great advantages of using BIM. Despite the importance of documentation based on 3D model, productivity analysis studies compared to traditional 2D-drawing-based documentation method are difficult to find in existing studies. In addition, empirical research on the effects of recycling 3D model and libraries information is hard to find. The purpose of this study is to analyze the productivity of documentation using 3D model in the fabrication phase. First, productivity data for the 2D-drawing-based documentation method and 3D-model-based documentation method for steel frame prefabrication of EPC project were acquired for each module. Second, additional time for tasks?such as 3D modeling and document review?were investigated to conduct the comparative analysis on the productivity of the two documentation methods. The results quantitatively show the productivity of 3D-model-based documentation and the learning effect of recycling 3D libraries.