反向曲线客货共线铁路桥梁车桥耦合分析

将车桥耦合动力学引入反向曲线铁路桥梁的动力响应分析,以某改线工程新建线路(设计速度为120km·h-1)上的反向曲线客货共线铁路桥梁为例,将车线动力分析软件与桥梁动力分析方法相结合,进行某普速客车及重载货车通过该反向曲线桥梁时的车桥耦合分析。结果表明:货车可以80km·h-1速度通过该反向曲线铁路桥梁,客车应在该反向曲线铁路桥梁的600m小半径曲线段限速100km·h-1;反向曲线的存在对车体横向振动加速度的影响比垂向大,随着车速的提高,车体垂向振动加速度逐渐增大,而车体横向振动加速度在超高均衡速度下最小;反向曲线铁路桥梁需警惕垂向及横向共振的影响,尤其在小半径曲线段桥梁的动力响应易超出安全限值。

Vehicle-Bridge Coupling Analysis for Reverse Curve Mixed Passenger and Freight Railway Bridge

Vehicle-bridge coupling dynamics was applied to reverse curve railway bridge to analyze the dynamic responses. As a case study, the dynamic performances were calculated during the passenger car and the heavy haul freight car passing the reverse curve mixed passenger and freight railway bridge on the new line of diversion project with the design speed of 120 km·h^-1 . The vehicle-line dynamic analysis software and the bridge dynamic analysis method were combined to carry out vehicle-bridge coupling analysis. Results show that the heavy haul freight car can pass the reverse curve railway bridge at the speed of 80 km·h^-1 , and the passenger car should limit the speed as 100 km·h^-1 in the 600 m small radius curve section . The influence of the reverse curve on the lateral vibration acceleration of the car body is greater than that of the vertical one. With the increase of speed, the vertical vibration acceleration of the car body increases gradually , while the lateral vibration acceleration at the superelevation balancing speed is the minimum. The influence of vertical and lateral resonance should be alert for the reverse curve railway bridge, which makes the dynamic responses of the bridge exceeding the safety limit easily in the small radius curve section especially.