风屏障导致的风载突变对列车运行安全的影响研究

发布时间：2019-03-22 09:38

【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。
[Abstract]:Based on the dynamic analysis model of the wind-vehicle-bridge system, the influence of the sudden change of wind load on the train running safety is discussed based on the calculation formula of the change of wind load on the vehicle body when the train enters and goes into the anti-wind barrier, and based on the established dynamic analysis model of the wind-vehicle-bridge system. Taking the ten-span simply supported box girder bridge on the second double-track of Lanxin Railway as an example, the dynamic response of the vehicle and the index of evaluating the driving safety are compared when one-sided 4m wind barrier is installed on the 200m section of the bridge and the whole bridge is installed with the unilateral 4m wind barrier. The results show that the sudden change of wind load caused by the wind barrier has a great effect on the lateral acceleration of the vehicle body, but has little effect on the vertical acceleration. When the average wind speed is the same, the index of evaluating the train safety when the wind barrier is installed in some sections is greater than that of the whole bridge, and the difference is greater when the wind speed is high. When the sudden change of wind load is considered, the index of evaluating train safety increases rapidly with the increase of average wind speed, and the higher the wind speed, the greater the increase of train safety.
【作者单位】：大连海事大学道路与桥梁工程研究所;北京交通大学土木建筑工程学院;
【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)
【分类号】：U270.11;U298.1

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