Dynamic response of a train-track-bridge coupling system under debris flow impacts
With the enhancing development of high-speed railway in western China,the issue of bridges subjected to geological hazard,such as debris flow,attracts more and more attention.The debris flow gives rise to additional deformations of the ballastless track on a bridge,and thus results in potential threats to the operation of high-speed trains.In this paper,a dynamic analysis model is established for a train-track-bridge coupling system subjected to debris flow impact.A simplified debris flow load in time domain is presented and regarded as the external excitation acting on the coupled train-track-bridge system.The debris flow load includes two parts: the slurry pressure and the boulder impact.The effect of dragon-head and dragon-tail is considered.A six-span simply-supported high-speed railway bridge with PC box girders is illustrated as the case study.Two types of dynamic analyses,considering the existence of a train on the bridge or not,are carried out.Results show that the dynamic response of the bridge subjected to debris flow impact is much greater than the one without impact.The running safety indices of the high-speed train in terms of derailment factors,offload factors and lateral wheel/rail forces can be drastically influenced.
high-speed train bridge debris flow dynamic response running safety
Xun Zhang Zhipeng Wen Linghui Ruan Rui Liu Xiaozhen Li
Department of Bridge Engineering,Southwest Jiaotong University,Chengdu,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
1374-1383
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）