列车荷载作用下钢轨动力可靠度分析的拟静力方法

利用模态分析法,建立了车辆-轨道垂向耦合动力计算模型。在模型中,车辆为附有二系弹簧的整车模型,钢轨被离散为双层弹性基础上的欧拉梁。采用Wilson-θ数值积分方法,得到了钢轨在列车荷载作用下的随机振动响应。基于结构动力可靠度理论的拟静力分析方法,得到了列车荷载作用下武汉轻轨系统轨道结构的可靠指标。根据计算结果,建议我国既有无缝线路轨道交通的可靠指标为3.70。

Quasi-static Method for Dynamic Reliability Analysis of Rail Due to Train Loads

The vertically dynamic model of track-ground system was developed by means of the modal analysis method,where the vehicle in the coupling system was a whole locomotive with two layers of spring and damping system,and the rails were considered as Euler beams with finite length rested on double layer elastic foundation.The random responses of the rails were achieved by Wilson-θ numerical integral method.Based on the quasi-static method of the dynamic reliability theory,the analysis of reliability index was done for the track-ground system of Wuhan light rail due to traffic loadings.According to the results,it was suggested that the reliability index of rail transit system in our country is 3.70.