小半径曲线段槽型梁桥车桥耦合振动研究

Study on Vehicle-Bridge Coupled Vibration of Small-Radius-Curved Trough Girder Bridge

为研究列车与小半径曲线区段槽型梁桥的车桥耦合振动特征及机理,以位于半径为300m曲线上的铁路单线简支槽型梁桥为背景进行分析。采用ANSYS建立全桥空间有限元模型,在计算分析槽型梁桥动力特性的基础上,采用随机振动理论模拟列车通过曲线段桥梁的全过程,评估列车的走行性,分析槽型梁桥的车桥耦合振动响应特征并与实测结果进行对比。结果表明:C62货运列车以不高于40km/h的速度通过半径仅为300m的曲线区段桥梁时,具有良好走行性;槽型梁桥具有足够的竖、横向刚度;曲线段槽型梁桥的横向振动响应可分解为离心力引起的结构横向静态响应和车桥耦合振动引起的结构横向动响应两部分。

In order to research the characteristics and mechanism of coupling vibration of train and small-radius-curved trough girder bridge,we analyzed the vibration response of single-track railway trough girder bridge located in curved line with radius of 300 m.Firstly,we established a spatial model of entire bridge with the ANSYS software.Then,based on the dynamic characteristics of trough girder bridge calculated,we simulated a whole process that freight train passes through a small-radius-curved bridge by means of random vibration theory,analyzed characteristics of vehicle-bridge coupled vibration,and assessed the train running property.Finally,we compared the structure vibration responses of dynamic simulation with the measured ones.The results show that a C62 freight train remains its good performances when running on the bridge located in a curved line with radius of 300 m at a speed of below 40 km/h,and the trough girder bridge possesses enough vertical and lateral stiffness.The transverse vibration response of small-radius-curved bridge consists of static response caused by centrifugal force and dynamic response caused by the coupling vibration of the vehicle-bridge system.