铁路钢桁架桥浮置板轨道动力特性分析

DYNAMIC CHARACTERISTIC ANALYSIS OF FLOATING SLAB TRACK OVER THE STEEL TRUSS RAILWAY BRIDGE

为探讨应用于钢桁架桥上的浮置板轨道的减振作用,文中以128m跨度颖河双线特大桥为研究背景,应用ABAQUS大型有限元模拟软件,建立高速列车-浮置板轨道-钢桁架桥耦合动力学模型。在验证模型正确性的基础上,对整体模型进行瞬态动力学分析,分析钢弹簧浮置板轨道对于钢桁架桥的减振效果,较普通板式轨道,浮置板轨道系统上部位移响应有明显增高,但车体仍能在安全稳定情况下运行,桥梁跨中加速度峰值由1.2m/s^2降低到0.31m/s^2。说明浮置板轨道的应用有利于降低桥梁振动响应,对于延长桥梁使用寿命有积极意义。

In order to discuss the vibration reduction effect of floating slab track applied on the steel truss bridge, the large FEM software,ABAQUS,was employed to build high speed train-steel spring floating slab track-bridge coupled dynamic model,the doublet super large bridge over the Ying river istaken as the research background. On the basis of verifying the correctness of the model,working on transient dynamics analysis of the whole model and vibration reduction effect of steel spring floating slab track on steel truss bridge. The displacement of the headpiece of the floating slab track system is obviously increased compared with the ordinary slab track, while the car can still run safely and steadily. The maximum acceleration of the middle bridge decreases from 1.2m/s^2 to 0.31m/s^2 which shows that the application of floating slab track is helpful to reduce the vibration response of bridges and has positive significance for prolonging the service life of bridges.