Application of Performance-Based Seismic Design Method for the Seismic Evaluation of Hybrid Structures

An improved multi-mode pushover analysis,which combines the advantage of the modal pushover analysis(MPA) and the adaptive pushover analysis(APA),has been proposed.In the multi-mode pushover analysis procedure,the multiple degree-of-freedom(MDOF) system can approximately be decomposed into equivalent single degree-offreedom(ESDOF) system of multi-mode.The response of each modal pushover analysis can be attained by using adaptive load pattern when the structures enter into plasticity.The target displacement of each mode pushover analysis can be obtained by inelastic spectrum.Numerical examples of different tall hybrid structures are calculated to evaluate the accuracy by comparing the structural responses of the proposed analysis procedure with the results of the nonlinear history analysis(NHA).It shows that the structural responses of the proposed pushover analysis are generally similar to the results from the NHA,especially in the story drift.