风屏障导致的风载突变对列车运行安全的影响研究  

Running safety analysis of the train considering sudden change of wind load induced by wind barrier

作　　者：张田[1] 夏禾[2] 郭薇薇[2] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动工程学报》2015年第1期122-129,共8页Journal of Vibration Engineering

基　　金：国家重点基础研究发展计划(973项目)(2013CB036203);中央高校基本科研业务费专项资金资助项目(3132014071;3132014326);国家自然科学基金资助项目(51308034)

摘　　要：推导了列车进出防风屏障时车体上的风荷载变化计算公式,基于建立的风-车-桥系统动力分析模型,讨论了车体上的风载突变对列车运行安全的影响。以兰新铁路第二双线上的十跨简支箱梁桥为例,在桥上200m区段安装单侧4m风屏障及全桥安装单侧4m风屏障时车辆的动力响应及评价行车安全性的指标进行对比,结果表明:风屏障导致的风载突变对车体横向加速度影响很大,而对竖向加速度影响较小;同一平均风速时,部分区段安装风屏障时评价列车安全性的指标要大于全桥安装风屏障的情况,高风速时差别更大;考虑风载突变时评价列车安全性的指标随平均风速增加而迅速增大,风速越高,增幅越大。The calculation formulae for wind load change acting on the car-body are derived when the train moves into or out of the wind barrier structure,and then the influence of the sudden change of the wind load on the train running safety is discussed on the basis of the dynamic analysis model of wind-vehicle-bridge system with wind barrier.Taking the 10-span simply-supported box girder bridge as an example,the response of the train and the indices of evaluating the train running safety are given under the case of 200 mlong single-side 4mbarrier on the bridge.These results are compared with those cases with wind barrier on the whole bridge.It is shown that the sudden change of wind load caused by wind barrier has significant influence on the lateral acceleration of the car-body,but no manifest influence on the vertical acceleration.At the same mean wind velocity the indices for evaluating the running safety of train vehicle with wind barrier only on some sections are greater than that with wind barrier on the whole bridge,and the difference is even greater at high wind velocity.In addition,the indices for evaluating the running safety increase rapidly with the mean wind velocity considering the sudden change of wind load,and the higher the wind velocity is,the greater the growth is.

关 键 词：风载荷 车辆 风屏障 动力响应 运行安全 

分 类 号：TU973.213[建筑科学—结构工程] U270.11[机械工程—车辆工程]