Abstract

Info

Title:: Analysis of Seismic Response Spectra Characters of Superhigh Rise Steel Structure

Author(s):: LI Ming; WANG Hao-ran; XU Xiao-xia; WANG Yuan-qing; DING Da-yi; School of Civil Engineering, Shenyang Jianzhu University

Keywords:: response spectra; seismic coefficient; dynamic magnification factor; characteristic period; spectra form

Abstract:: In order to analyze the floor response characteristics spectrum of superhigh rise building, floor response spectrums were calculated by inputting different ground motions to China Financial Information Mansion. The floor and ground response spectrums were compared from the following four aspects: seismic coefficient, dynamic amplification coefficient, characteristic period and shapes of response spectrums. The results show that the floor seismic coefficient and the magnification coefficient are greater or smaller than the corresponding ground one respectively, the biggest difference of which is nearly 1 time; all the floor characteristic periods are greater than those of the ground, the biggest difference of which is over 60%; there are obvious differences between the shapes of floor and ground dynamic magnification factor spectra under some conditions, the second peak of the former may be very large, even near to the first peak, while the latter one has no such phenomenon. Therefore, when the seismic response of floor subsidiary structure is calculated, it is necessary to consider the change of floor seismic coefficient, dynamic magnification factor, characteristic period and spectra shape based on the main structure.