Abstract

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Title:: Analysis on Response of Long Span Cable-stayed Bridge Under Long-period Ground Motion

Author(s):: ZHAO Guo-hui; GUO Hua-dong; LIU Jian-xin; Key Laboratory of Highway Bridge and Tunnel of Shaanxi Province, Chang’an University

Keywords:: long-period ground motion; long span cable-stayed bridge; seismic response; elastic link device; fluid viscous damper

Abstract:: In order to study the influence of longperiod ground motion on seismic response of long span bridges, some longperiod ground motions and conventional ground motions were selected, and the comparative analysis on spectral characteristics of these motions were carried out. A long span cablestayed bridge was taken as an example to analyze the seismic response of the bridge under two types of ground motions by using nonlinear timehistory method. Elastic connection device and fluid viscous damper were used to mitigate the seismic response of the bridge under two types of the ground motions. In addition, the effects of the two kinds of devices were analyzed. The results show that long period ground motions have great influence on seismic response of the bridge. Elastic connection device has lower efficiency and will introduce more seismic force into the bridge under longperiod ground motion. While, the effect of fluid viscous damper is broadspectrum, that is, it has wonderful and stable effect under both longperiod ground motion and conventional ground motion with proper damping parameters.