桥梁风屏障的气动效应及其对高速列车运行安全的影响分析  

ANALYSIS ON AERODYNAMIC EFFECTS OF BRIDGE WIND BARRIER AND ITS INFLUENCE ON RUNNING SAFETY OF A HIGH-SPEED TRAIN

作　　者：郭薇薇[1,2] 夏禾[1,2] 张田[3] 

机构地区：[1]北京交通大学土建学院,北京100044 [2]北京市结构风工程和城市风环境重点实验室,北京100044 [3]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《工程力学》2015年第8期112-119,128,共9页Engineering Mechanics

基　　金：国家973项目(2013CB036203);国家自然科学基金项目(51308034;U1434205);"111"项目(B13002)

摘　　要：基于风-车-桥系统动力分析模型,分析了风屏障对车桥系统气动效应及桥上高速行驶车辆运行安全性的影响。以新建兰新铁路百里风区跨度16 m简支槽形梁为工程背景,通过风洞试验测试了有、无风屏障时车辆、桥梁的三分力系数,然后对强侧风作用下车辆通过桥梁时的动力响应进行了数值模拟,综合分析得到了保证列车在桥上运行安全的风速-车速阈值曲线。结果表明,对未设置风屏障的桥梁,当风速超过15 m/s即应限速行驶;而设置风屏障后,桥上车辆的运行安全性指标得到了极大地改善,即使风速达到40 m/s,列车仍可以260 km/h的速度安全运行。The influences of wind barriers on the aerodynamic effects of a train-bridge system and running safety of a high-speed train on a bridge are analyzed on the basis of a dynamic analysis model for a wind-train-bridge system. Taking a 16 m span simply-supported U-girder bridge located in Baili wind aera on Lanzhou-Xinjiang new high-speed railway as an engineering background, the three-component force coefficients of the train vechicle and the bridge girder were measured with and without barriers by wind tunnel tests. The whole histories of a train passing through the bridge subjected to strong cross winds are simulated, from which the threshold curve of train speed and wind velocity for ensuring the running safety of the train on the bridge is proposed. The numerical results show that the train speed on the bridge should be limited as the wind velocity is over 15 m/s in the case without the wind barriers, whereas with the designed wind barriers, the train can still run safely at 260 km/h on the U-girder bridge even when the wind velocity reaches 40 m/s.

关 键 词：高速铁路 行车安全 风-车-桥动力分析 风屏障 气动效应 阈值曲线 

分 类 号：U448[建筑科学—桥梁与隧道工程]