风屏障透风率对侧风下货运专线简支箱梁桥车桥耦合振动影响研究  

A Study on Effect of Ventilation Rate of Wind Barrier on Vehicle-bridge Coupling Vibration of Simply Supported Box Girder Bridge of Freight Dedicated Line under Crosswind

作　　者：何宝华 HE Baohua(CHN Energy Xinshuo Zhunchi Railway(Shanxi)Co.,Ltd.,Shuozhou 036002,China)

机构地区：[1]国能新朔准池铁路(山西)有限责任公司,山西朔州036002

出　　处：《高速铁路技术》2023年第4期56-62,共7页High Speed Railway Technology

摘　　要：为探究强风作用下风屏障透风率对货运专线铁路车桥耦合振动的影响,通过数值模拟计算不同透风率风屏障桥梁在不同位置行车时的车桥系统三分力系数,根据弹性系统动力学总势能不变值原理建立考虑风荷载的车桥系统耦合振动方程,对横风作用下货运列车通过设置不同透风率风屏障的简支箱梁桥时的车桥动力响应进行计算。结果表明:(1)桥梁横向位移受到风屏障透风率和列车行驶位置的影响,存在某一个透风率使得桥梁横向位移最小;(2)风屏障透风率从20%增加到60%,列车的脱轨系数和轮重减载率呈增大趋势,迎风车的两项参数均大于背风车;(3)重车的横向摇摆力大于空车,横向摇摆力随风屏障透风率增大的幅度受列车重量影响较小。In order to explore the effect of the ventilation rate of wind barrier on vehicle-bridge coupling vibration of freight dedicated railway under strong wind,this paper calculated the three-component coefficient of vehicle-bridge system of bridges with wind barriers with different ventilation rates during train operation at different positions by numerical simulation,established the vehicle-bridge coupling vibration equation considering wind load according to the principle of the constant total potential energy of elastic system dynamics,and calculated the vehicle-bridge dynamic response of freight trains passing through simply supported box girder bridges with different ventilation rates under crosswind.The results show that:(1)The lateral displacement of the bridge is affected by the ventilation rate of the wind barrier and the position of the running train,and there is a certain ventilation rate that minimizes the lateral displacement of the bridge.(2)When the ventilation rate of wind barrier increases from 20%to 60%,the derailment coefficient and wheel unloading coefficient of the train show an increasing trend,and both parameters of windward vehicle are greater than those of leeward vehicle.(3)The lateral swaying force of the loaded vehicle is greater than that of an empty vehicle,and the increased range of lateral swaying force with wind barrier’s ventilation rate is less affected by train weight.

关 键 词：风屏障 风-车-桥耦合 动力响应 货运列车 简支箱梁 

分 类 号：U441[建筑科学—桥梁与隧道工程]