Abstract: Abstract: The efficiency of constructing building information model by Revit is rather low. Based on Revit’s secondary development, in the absence of the CAD drawings of pile foundation caps, an automatic design algorithm for pile foundation cap is proposed by identifying the primitive information of the internal force diagram of the column (wall) generated by the structural analysis software. The method is based on the calculation of the eigenvalue calculation table of the vertical bearing capacity of the single pile in Revit. The algorithm program is written in C#. Then the pile foundation cap is automatically designed according to the requirements of the structure and the superstructure of the cap, and the pile caps satisfying the bearing capacity requirements are accurately arranged under the corresponding columns (walls), which significantly improves the efficiency of pile foundation engineering modeling, and facilitates the subsequent engineering calculations and economic comparison of different pile foundations.

Key words: Keywords: Revit secondary development, CAD, pile foundation cap, engineering quantity