Seismic Response Analysis of Train-Bridge Coupling System Considering Topographic Effects

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (17) : 69-76.

QIAO Hong 1 XIA He 1 DU Xian-ting 1 NAN Yong 1

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Abstract

The influence of topography on the dynamic response of train-bridge system under earthquake is studied. According to the theory of viscous-spring artificial boundary, a 3-D finite element model of site accounting for the topographic effects is established by using the ANSYS. The process of wave input is realized by transforming the seismic time history into equivalent loads acting on the artificial boundary, by means of which the seismic time history at each support of bridge can be obtained. The dynamic analysis of a train-bridge system subjected to multi-support seismic excitations is carried out, in which the velocity and displacement time histories of seismic excitations are exerted on the bridge supports. With a train passing through a 480m bridge as a case study, the dynamic responses of train-bridge system under earthquakes considering local topography are analyzed. The results show that the dynamic response of the train-bridge system changes on the peak value as well as the time of peak appearance, and the variation rule changes as the type of site where the bridge is located changes, demonstrating that it is necessary to consider topographic effects in dynamic analysis of train-bridge system under earthquakes.

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QIAO Hong 1 XIA He 1 DU Xian-ting 1 NAN Yong 1. Seismic Response Analysis of Train-Bridge Coupling System Considering Topographic Effects[J]. Journal of Vibration and Shock, 2015, 34(17): 69-76

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