摘要
为研究桥上风屏障局部破坏对桥梁列车行车安全性的影响,以某四塔公铁两用斜拉桥为背景,进行列车动力响应和行车安全性影响参数分析。推导列车通过风屏障破坏段时车辆和桥梁的风荷载,并通过桥梁和列车节段模型风洞试验,测得计算所需气动力系数;在此基础上建立风-车-轨-桥耦合振动模型,研究了风屏障破坏段长度、平均风速和列车车速对列车动力响应及行车安全的影响。结果表明:突风效应会导致列车横向位移达到最大值,遮风效应会使列车横向加速度达到最大值;随风屏障破坏段长度、平均风速和列车车速的增加,列车动力响应随之增加;风屏障破坏会增加列车的轮重减载率和脱轨系数,并且高风速下各节车辆在风屏障破坏段的脱轨系数差异较大;仅在风速不大于10 m/s时,列车可以180 km/h的车速安全通过风屏障破坏段。
The impact of local damage of wind barriers on the running safety of trains on bridge is studied.Based on an existing four-pylon rail-cum-road cable-stayed bridge,the dynamic responses of trains and influential factors of train running safety are analyzed.The wind loads on the train and the bridge when the train is passing through the deck with damaged wind barriers are derived.Segmental wind tunnel tests of the bridge and train were conducted to obtain the required aerodynamic coefficients,with which,a wind-vehicle-track-bridge coupling vibration model was developed to study the impact of damage length of wind barriers,average wind velocity and train running speed on the dynamic responses of the train and running safety.It is shown that abrupt wind loads change aggravates the lateral displacement of the train,which is likely to reach the maximum,and the wind shielding effect impacts the lateral acceleration of the train,and the value is also of likelihood to be the maximum.As the damage length of the wind barriers,average wind velocity and train speed increase,the dynamic responses of the train accelerate.Wind barrier damage can trigger the rising of wheel load reduction rate and derailment coefficient of the train,and the carriages of the train exhibit varying derailment coefficient on the deck with damaged wind barriers under high wind velocity.The train can run through the deck with damaged wind barriers safely at a speed of 180 km/h,just when the wind velocity is below 10 m/s.
作者
吴肖波
张迅
韩艳
何旭辉
WU Xiao-bo;ZHANG Xun;HAN Yan;HE Xu-hui(State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430034,China;China Railway Bridge Science Research Institute,Ltd.,Wuhan 430034,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第1期78-86,共9页
Bridge Construction
基金
国家自然科学基金项目(52178452)
湖北省技术创新专项重大项目(2018AAA029)
湖南省科技创新计划项目(2021RC4031)。
关键词
大跨度桥梁
风-车-轨-桥耦合振动模型
风屏障
风载突变
行车安全
脱轨系数
轮重减载率
气动力系数
long-span bridge
wind-vehicle-track-bridge coupling vibration model
wind barrier
abrupt wind load change
running safety
derailment coefficient
wheel load reduction rate
aerodynamic coefficient
