Seismic Design of Steel Frames Considering Structural Weight and Fabrication Cost

Abstract eng:
The building structural engineers can’t necessarily predict the fabrication cost from the structural weight appropriately. It is because the fabrication cost for steel members depends upon the complexity of the connections rather than the structural weight. In this study, simple fabrication time functions for steel building rigid frames are first shown. Next, three steel building frames (Nos.1, 2 and 3) satisfying Japanese seismic codes are designed. Members of a building frame are generally grouped together to have the same size. No.1 is designed so as to make the fabrication cost small by using small number of groups of member sizes; No.3 to make structural weight small by using large number of groups of member sizes; No.2 is the intermediate case. The fabrication time for 3 frames is estimated by the presented function and the total cost consisting of fabrication time and material cost is discussed.

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