CRTSII型无砟轨道温度翘曲变形及其对车线动力响应的影响  

TEMPERATURE WARPING AND IT'S IMPACT ON TRAIN-TRACK DYNAMIC RESPONSE OF CRTSII BALLASTLESS TRACK

作　　者：杨静静[1] 张楠[1] 高芒芒[2] 孙加林[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国铁道科学研究院,北京100081

出　　处：《工程力学》2016年第4期210-217,共8页Engineering Mechanics

基　　金：国家973计划项目(2013CB036203);中央高校基本科研业务费专项资金项目(2015YJS117);蒙西华中铁路股份有限公司科技研究开发计划课题项目(2013G001-B);中国铁路总公司科技研究开发计划课题项目(2013G001-A-1)

摘　　要：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。The temperature measurement of track slab was carried out for two days near Xiaoganbei Railway Station. The warping of track slab under overall temperature change and temperature gradient was analyzed with the temperature field of track slab simulated by applying temperature load on the nodes. By applying the vertical rail displacements caused by the warping of track slab as the additional rail irregularities, the dynamic analysis model was established to analyze the dynamic performance of the train-track system, based on which the running safety of high-speed train in the warping section of track slab was calculated. The results show that the temperature warping of CRTSII slab ballastless track is mainly influenced by the temperature gradient and the difference between initial temperature and surface temperature. Larger temperature gradient causes larger temperature warping. Under the same temperature gradient, the temperature warping is reduced with the decrease of the difference between initial temperature and surface temperature. The dynamic responses are larger, especially the accelerations of rail and track slab when considering the additional rail irregularities caused by the temperature warping of track slab, which leads to degraded running safety indexes.

关 键 词：CRTSII型板式无砟轨道 轨道板 温度翘曲变形 附加轨道不平顺 车线系统动力性能 

分 类 号：U213.2[交通运输工程—道路与铁道工程]