Analysis on seismic energy response of super tall mega-frame structure under different ground motion record selection methods

Elasto-plastic time history analysis on a super tall mega-frame structure under the rare earthquake was carried out using three ground motion record selection methods,and effects of three methods on the structure' s energy response were compared and evaluated. Through the seismic energy response analysis results,influences of record selection methods based on fitting design acceleration response spectrum and fitting energy response spectrum were evaluated. Spectrum-matched method can maintain actual earthquake record's characteristics as well as reflecting the design spectrum perfectly. Fitting energy response spectrum method and spectrum-matched method were proposed to select real rare earthquake records and produce artificial earthquake record respectively. Based on calculations,design acceleration spectrum in long period was amplified artificially so exaggerated structural energy response will be resulted while using fitting design acceleration response spectrum method,and the energy response is around 10 times of that by fitting energy response spectrum method. It should be noticed in structural design and seismic analysis under rare earthquake of super tall building.