Displacement-Based Multiple Performance Objective Seismic Design on Capacity Spectrum Method

Combining the improved capacity spectrum method with seismic design theory of multiple performance objectives,a seismic design method of displacement-based capacity spectrum with multiple performance objectives was proposed.Using the proposed seismic design method,displacement demands and ductility coefficient of structures under different seismic fortification levels were obtained,and a multi-level demand spectrum was also formed.Based on this multi-level demand spectrum,multiple key points were gained,which formed a capacity curve for structural design.Structural design based on the proposed curve can satisfy both elastic displacement demands of minor earthquake and elastic-plastic displacement demands.Finally,the whole seismic design process of a SDOF pier was analyzed.It has been proved that the proposed method can satisfy the displacement demands of different seismic fortification levels,and can make the structures designed in this method more economical.