Pushover analysis procedure for systems considering SSI effects based on capacity spectrum method |
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Authors: | Wang Fengxia Ou Jinping |
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Affiliation: | 1. Heilongjiang Science and Technology Institute, Harbin, 150090, China;Helongjiang Science and Technology Institute,Harbin,150090,China 2. School of Civil Engineering, Harbin Inst of Technology, Harbin, 150090, China; Dalian University of Technology, Dalian 116024, China |
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Abstract: | This paper presents a new procedure to transform an SSI system into an equivalent SDOF system using twice equivalence. A pushover analysis procedure based on the capacity spectrum method for buildings with SSI effects (PASSI)is then established based on the equivalent SDOF system, and the modified response spectrum and equivalent capacity spectrum are obtained. Furthermore, the approximate formulas to obtain the dynamic stiffness of foundations are suggested.Three steel buildings with different story heights (3, 9 and 20) including SSI effects are analyzed under two far-field and two near-field historical records and an artificial seismic time history using the two PASSI procedures and the nonlinear response history analysis (NL-RHA) method. The results are compared and discussed. Finally, combined with seismic design response spectrum, the nonlinear seismic response of a 9-story building with SSI effects is analyzed using the PASSI procedures, and proposed procedure is verified. |
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Keywords: | pushover analysis procedure soil-structural interaction (SSI) capacity spectrum method equivalent SDOF system nonlinear response history analysis |
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