桥梁墩台不均匀沉降时的车桥垂向系统耦合振动分析  

Vehicle-Bridge Vertical System Coupled Vibration Analysis under the Uneven Settlement of Bridge Pier and Abutment

作　　者：宋国华[1] 高芒芒[2] 黎国清[1] 

机构地区：[1]中国铁道科学研究院铁道部基础设施检测中心,北京100081 [2]中国铁道科学研究院铁道科学技术研究发展中心,北京100081

出　　处：《中国铁道科学》2010年第2期29-33,共5页China Railway Science

基　　金：铁道部科技研究开发计划项目(2007G025)

摘　　要：运用自编车—线—桥垂向耦合振动分析程序,分析车辆通过桥梁时列车和桥梁的动力响应,研究桥梁墩台发生不均匀沉降对车、桥垂向系统耦合振动的影响。研究表明:货物列车通过时,在桥梁墩台不均匀沉降单一因素引起轨道不平顺的条件下,车辆和桥梁的动力响应随着列车速度的提高而增大,列车在经过桥梁折角时,轮轨力增大;在普通轨道不平顺和桥梁墩台不均匀沉降引起的附加轨道不平顺叠加的条件下,车辆和桥梁的动力指标中受到影响最大的是车体加速度,其次是轮重减载率,但各项指标均在规范规定的范围内。因此,对于客货共线的桥梁,规范限值可以满足货车运行安全性的要求,并且有一定的预留量。The vertical coupled vibration analysis program of vehicle-track-bridge was compiled to analyze the dynamic response of vehicle and bridge when the train running through the bridge and study the influence of the uneven settlement of the bridge pier and abutment on vehicle-bridge vertical coupled vibration system. The research shows that, under the condition that the track irregularity caused alone by the uneven settlement of bridge pier and abutment when freight train passing through the bridge, the dynamic response of vehicle and bridge increases with the increase of the train speed, the wheel-rail force increases when the train running through the bending angle of the bridge. Among the dynamic indexes of the vehicle and bridge, the car body acceleration is the one most affected and the reduction rate of wheel load is the second under the combined action of ordinary track irregularity and irregularity caused by the uneven settlement of pier and abutment, and all values meet the requirements of the norm when the train running through the bridge. For the bridge of passenger-freight mixed transportation on the same line, the limit values of the norm can satisfy the requirement of the operation safety for freight train and have certain reservation.

关 键 词：铁路桥梁 轨道不平顺 桥梁墩台 不均匀沉降 车桥动力响应 

分 类 号：U211.5[交通运输工程—道路与铁道工程]