高速列车作用下路基上板式无砟轨道动力系数  

Dynamic coefficient of slab track system on subgrade under high-speed trains

作　　者：徐庆元[1] 李斌[1] 周小林[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2011年第9期2831-2836,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51178469);铁道部科技开发计划项目(2008G031-17-1)

摘　　要：基于列车-轨道耦合动力学理论,建立列车-板式无砟轨道-路基三维有限元耦合动力学模型,并对建立的三维有限元耦合动力学模型进行相应的程序验证。运用建立的耦合动力学模型,对列车在路基上板式无砟轨道线路上高速行驶时,在线路平顺工况和各种不平顺工况下,无砟轨道各部件动力特性和相应动力系数进行理论研究。研究结果表明:在线路平顺状态下,车辆轮载及无砟轨道各部件动力响应很小,动力系数不超过1.2;在线路中长波随机不平顺激扰下,轮载动力系数接近2,无砟轨道各部件动力系数在1.70～2.06之间,轮载动力系数和无砟轨道各部件动力系数相差不大;短波不平顺对轮载动力系数有很大的影响,由于短波不平顺引起的振动在无砟轨道中衰减很快,其对无砟轨道上部部件动力系数的影响较大,而对无砟轨道下部部件动力系数的影响很小。A vehicle-slab track-subgrade three-dimensional finite element coupling dynamic model was established based on vehicle-track coupling dynamic theory,and corresponding program was developed and verified.With the established dynamic model,taking high-speed trains passing slab track on subgrade as an example,dynamic characteristic and corresponding dynamic coefficient of slab track system were theoretically studied under load case of no track irregularity as well as load case of different kinds of track irregularity.The calculated results show that in the load case without track irregularity,the dynamic coefficient of vehicle load and slab track system is small,the value is below 1.2;in the load case of middle-long-wave random track irregularity,the dynamic coefficient of vehicle load is approximately 2.0,dynamic coefficient of slab track system is between 1.70 and 2.06,and there is no big difference between dynamic coefficient of vehicle load and dynamic coefficient of slab track system.Short-wave track irregularity has great influence on the dynamic coefficient of vehicle load,because vibration caused by short-wave track irregularity decays rapidly in slab track system,and the dynamic coefficient of upper part of slab track system is bigger than the dynamic coefficient of lower part of slab track system.

关 键 词：三维有限元 耦合动力学 板式无砟轨道 高速铁路 

分 类 号：U213.3[交通运输工程—道路与铁道工程]