Citation

Han Y, Xia H, Zhang N. Zhongguo Tiedao Kexue 2006; 27(5): 46-53.

Affiliation

College of Architecture, North China University of Technology, Beijing 100041, China

Copyright

(Copyright © 2006, Zhongguo Tiedao Kexue Yanjiuyuan)

DOI

unavailable

PMID

unavailable

Abstract

To study the seismic influence on the running safety of train passing high-speed railway bridges, a dynamic model of coupled bridge-train system subjected to earthquakes is established by connecting the motion equations of the bridge under earthquakes and those of the vehicles through the nonlinear contact relations between wheels and rails, in which the non-uniform characteristics of the seismic waves input from different foundations are considered. A computer simulation program is worked out. The case study is performed to a continuous bridge on the planned high-speed railway in China. The whole histories of the trains running over the bridge are simulated and the influences of train speeds and seismic wave traveling speeds on the dynamic response of the train-bridge system are studied. Results show that the effect of seismic traveling waves has great influence on the dynamic responses of the train-bridge coupled system, and it is not always true that the faster the seismic wave traveling speed is, the closer the dynamic response of the bridge-train coupled system to the corresponding ones under the uniform seismic excitations. The seismic traveling wave speed should be considered according to the property of the soil at the bridge site in calculating the dynamic response of train-bridge system subjected to earthquakes. The dynamic response of train vehicles including the lateral car body accelerations and the safety evaluation indexes all increase with the train speed, so the influences of train speed must be taken into account in evaluating the running safety of vehicles on the bridge during earthquakes. The critical running speed limits ensuring train running safely on the bridge during earthquakes are proposed.