基于Matlab的车辆-无砟轨道-简支梁桥垂向耦合动力特性分析  

Analysis of Vertical Coupling Dynamic Characteristics of Vehicle-Ballastless Track-Simply Supported Beam Bridge Based on Matlab

作　　者：孙奕琪 韩悌磊 SUN Yi-qi;HAN Ti-lei(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《兰州工业学院学报》2020年第4期6-10,共5页Journal of Lanzhou Institute of Technology

摘　　要：针对高速列车过桥时对无砟轨道的振动响应问题,应用Matlab建立车-轨-桥垂向耦合动力学仿真模型,基于车-轨-桥耦合动力学理论,将整个车轨桥系统分为车辆、轨道、桥梁3个子系统,通过求解各个子系统的运动方程,得到车轨桥系统耦合的数值解,进一步研究列车速度、扣件刚度对轨道结构的运动规律.结果表明:钢轨振动加速度、车体垂向振动加速度均随着扣件刚度的增大而减小.随着扣件刚度每增加20 MN/m,钢轨振动加速度相对减少35 m/s^2;行车速度越大,其钢轨垂向加速度、轨道板垂向加速度、车体垂向加速度都越大.In view of the vibration response of high-speed train to ballastless track when crossing the bridge, MATLAB is used to establish the vertical coupling dynamic simulation model of vehicle-rail-bridge. Based on the vehicle-rail-bridge coupling dynamic theory, the whole vehicle rail bridge system is divided into three subsystems: vehicle, track and bridge. By solving the motion equations of each subsystem, the numerical solution of vehicle rail bridge system coupling is obtained for further study on the motion law of train speed, fastener stiffness and so on to the track structure. The results show that the rail vibration acceleration and the vertical vibration acceleration decrease with the increase of fastener stiffness. With every 20 MN/m increment in the stiffness of the coupler, the rail vibration acceleration decreases by 35 m/s^2. The greater the driving speed, the greater the vertical acceleration of rail, rail plate and car body.

关 键 词：无砟轨道桥梁 扣件刚度 列车速度 动力响应 

分 类 号：U213.2[交通运输工程—道路与铁道工程]