大跨度铁路桥梁梁端伸缩装置对列车走行性影响的研究

梁端伸缩装置是大跨度桥梁的重要组成部分,是容易受损的构件之一,对高速车辆的走行性影响较大。本文针对大跨度铁路桥梁梁端伸缩装置,建立结构动力分析的有限元模型,通过多工况车-桥(线)耦合振动计算,分析梁端伸缩装置自身变形、安装误差及梁端折角等因素对列车走行性的影响,提出车辆平稳性和乘客对车辆振动感觉的评判标准,并进一步基于车辆的平稳性和乘客对车辆振动的感觉确定车速及梁端竖向折角限值。研究表明,车辆响应对梁端竖向折角较为敏感。

Performance of Train Running over Expansion Joints at Beam Ends of Long-span Railway Bridge

The expansion joint at the beam end of a long-span bridge is an important attachment and also one of the most easily damaged components.It has important effect on train running performance.The FEM model was established for dynamic structural analysis of the expansion joint at the beam end of a long-span railway bridge.Vehicle-bridge(lines) coupling vibrations under multiple operating conditions were calculated.to investigate the influence of the deflection of the expansion joint,installation error and vertical rotation angle at beam ends on the running performance of vehicles.The criterions for evaluation of train running performance and passenger feeling to vibration were given.On the basis of the evaluation criterions,the allowable values of the train velocity and vertical rotation angle at the beam end were determined.The results show that vehicle responses are more sensitive to the vertical rotation angle at the beam end.