DYNAMIC ANALYSIS OF TRAIN-BRIDGE SYSTEM SUBJECTED TO EARTHQUAKE ACTION CONSIDERING TOPOGRAPHIC EFFECTS

Abstract eng:
A method taking into consideration the topographic effects in dynamic analysis of a train-bridge system subjected to earthquake action is presented and the influence of topography on the seismic response of train-bridge system is studied. Based on the theory of viscousspring artificial boundary, a 3-D finite element model for the site considering topographic effect is established by using the ANSYS. The procedure 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 histories at the supports of bridge are obtained. The dynamic model for a train-bridge system subjected to multi-support seismic excitations is established, in which the velocity and displacement time histories of earthquake waves are exerted on the bridge supports. With a train passing through a 480m bridge as a case study, the dynamic response of the train-bridge system under earthquakes considering local topography of the site is analyzed, and compared with those without considering the topographic effect. The results show that when the topographic effect is considered, the dynamic response of the trainbridge system changes on the peak value as well as the time of the peak appearance, showing that it is necessary to consider the topographic effect in dynamic analysis of train-bridge system under earthquakes.

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