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以孝感北站附近综合工区内的轨道板为研究对象,对露天环境下的轨道板进行两天的温度测量。采用节点温度荷载的加载方式对轨道板温度场进行模拟,分析轨道板整体温度升降和温度梯度共同作用下轨道板的温度变形。轨道板的翘曲引起钢轨的垂向变形,将其作为附加轨道不平顺分析车线系统的动力性能,并以此为基础计算高速列车通过轨道板翘曲区段时的行车安全性问题。研究表明,CRTSII型板式无砟轨道结构轨道板温度翘曲变形分析主要考虑两个因素:温度梯度值大小;轨道板面温度与初温。温度梯度值越大,翘曲变形的最大竖向位移越大;相同温度梯度时,轨道板面温度越接近初温,翘曲变形的最大竖向位移越小。在温度荷载影响路段,各项动力指标较正常路段都有所增大,钢轨和轨道板的垂向振动加速度的增大尤为显著,行车安全性指标劣化。
Taking the orbital plate in the comprehensive work area near Xiaogan North Station as the research object, the temperature of the orbital plate in the open air environment was measured for two days. The temperature field of the track slab is modeled by the loading method of node temperature load, and the temperature deformation of the slab is analyzed under the combined action of temperature gradient and temperature gradient. The warp of the track slab causes the vertical deformation of the rail and analyzes the dynamic performance of the train system as an additional track irregularity. Based on this, the driving safety of the high-speed train passing through the warp section of the track slab is calculated. The results show that the temperature warping deformation of CRTSII slab track slab mainly takes into account two factors: the temperature gradient, the temperature of the slab and the initial temperature. The larger the temperature gradient, the greater the maximum vertical displacement of warpage. At the same temperature gradient, the closer the plate temperature becomes to the initial temperature, the smaller the maximum vertical displacement of warpage will be. In the sections affected by temperature load, all the dynamic indexes have increased compared with normal sections, and the vertical vibration accelerations of rails and track slabs increase significantly, and the driving safety index is deteriorated.