列车制动参数对大跨度悬索桥梁轨相互作用影响研究  

Influence of train braking parameters on beam rail interaction of long-span suspension bridge

作　　者：于向东[1] 张贺 敬海泉 YU Xiangdong;ZHANG He;JING Haiquan(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center for High-speed Railway Construction,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程研究中心,湖南长沙410075

出　　处：《铁道科学与工程学报》2023年第11期4243-4255,共13页Journal of Railway Science and Engineering

基　　金：湖南省创新平台与人才计划项目(2021RC3017)。

摘　　要：为研究列车制动下大跨度悬索桥无缝线路纵向力的分布规律,基于ANSYS软件和梁轨相互作用理论,建立大跨度悬索桥梁轨一体化动力分析模型,根据CRH动车组列车的制动力时程,分别研究制动停车位置、制动初速度、列车种类、列车挠曲力和制动力等因素对钢轨附加应力和梁轨相对位移的动力、静力影响。结果表明:由于动力计算考虑到前一荷载步对后一荷载步的影响以及线路纵向阻力滞回特性的影响,动力、静力计算结果差别显著,传统静力计算低估了列车荷载作用下钢轨的受力,在实际工程应用时有必要按动力方法计算列车荷载作用下大跨度悬索桥梁轨相互作用问题;制动停车位置对钢轨附加拉应力和梁轨相对位移增量影响显著,列车制动停止于主跨跨中位置为本文研究大跨度悬索桥梁轨相互作用所选4种典型工况中的最不利工况;列车制动力对梁端位置钢轨附加拉应力和梁轨相对位移影响显著,列车挠曲力对主桥范围内钢轨附加应力和梁轨纵向位移的分布规律影响显著,并与钢轨附加压应力峰值大小表现出较强的相关性;CRH5和CRH2型动车组列车为研究CRH型动车组制动下大跨度悬索桥梁轨相互作用的不利车型,其中CRH5型动车组最不利制动方式为最大常规制动;由于CRH动车组列车制动初速度不影响列车制动力峰值大小,大跨度悬索桥梁轨相互作用对制动初速度因素变化并不敏感。研究成果可为完善列车制动下桥上无缝线路设计和计算提供参考和借鉴。In order to study the distribution law of longitudinal force of continuous welded rail(CWR)of long-span suspension bridge under train braking,based on ANSYS software and track-bridge interaction theory,a dynamic analysis model of track-bridge integration of long-span suspension bridge was established.According to the braking force time history of CRH electronic multiple units(EMU),the effects of braking stop position,initial braking speed,train type,vertical force of train and braking force of train on the additional stress of rail and the relative displacement between rail and bridge were studied.The results are drawn as follows.Because the dynamic calculation takes into account the influence of the previous load step on the next load step and the influence of the longitudinal resistance hysteresis characteristics of the line,the calculation results of the dynamic and static are significantly different.The traditional static calculation underestimates the force on the rail under the train load,so it is necessary to calculate the track-bridge interaction of long-span suspension bridges under the train load according to the dynamic method in practical engineering applications.The braking stop position has a significant impact on the additional tensile stress of rail and the relative displacement increment between rail and bridge.The train braking stop at the middle position of the main span is the most unfavorable condition among the four typical working conditions selected to study the track-bridge interaction of long-span suspension bridges.The braking force of train has a significant impact on the additional tensile stress of the rail at the bridge end position and the relative displacement between rail and bridge.The vertical force of train has a significant impact on the distribution of the additional stress of the rail and the longitudinal displacement between rail and bridge within the scope of the main bridge,and shows a strong correlation with the peak value of the additional compressive stress of the rai

关 键 词：梁轨相互作用 悬索桥 动力分析 列车制动力时程 CRH动车组列车 

分 类 号：U213.212[交通运输工程—道路与铁道工程]