Three-Dimensional Stochastic Train-Bridge Coupling Dynamics Under Aftershocks

Authors：Xiang, Ping; Guo, Peidong; Zhou, Wangbao^*; Liu, Xiang; Jiang, Lizhong; Yu, Zhiwu; Yu, Jian

Source：International Journal of Civil Engineering, 2023, 21(10): 1643-1659.

DOI：10.1007/s40999-023-00846-0

• Structure dynamics
• Creep
• Residual deformation
• Rail irregularity
• Karhunen-Loeve expansion
• New point estimate method

The deformation of the track on bridge after the earthquake mainly includes bridge creep and seismic-induced deformation, which poses a serious threat to the running safety of trains. In order to study the influence of the comprehensive deformation on the train-bridge system, a three-dimensional model of train-bridge coupling analysis was established. New point estimation method was used to solve the stochastic problem of initial track irregularity, aiming to study the changes of system motion under different parameters including deformation degrees and train speed. Results show that system motion increases with the increase of track parameters, and the earthquake intensity has the greatest influence on the train the motion, which reaches the peak in 0.4 g. The train speed has the greatest influences on the bridge when the train speed reaches the peak value of 400 km/h, while the impact of bridge creep is the smallest. Conclusion was obtained that the results of random analysis are of more general significance, and that in the vehicle-bridge system considering comprehensive track deformation after earthquake, the damage effect of track deformation induced by earthquake intensity is mainly considered for train, and the impact of train speed shall be mainly considered in bridge design.

• Institution
  重庆大学; 天津大学; 长沙理工大学; 长安大学