摘要
To investigate the effects of sudden change in wind loads on the running performance of trains on the bridge in crosswinds,a highway-railway one-story bridge was taken as the research object.Aerodynamic coefficients of the train and the bridge were measured in a series of train-bridge system segment models through wind tunnel tests when two trains passed each other on the bridge and when a train entered and left the wind barrier section of the bridge.Based on the improved SIMPACK and ANSYS rigid-flexible coupling simulation method,a wind-double train-track-bridge system coupled vibration model was established.The dynamic responses of the train were analyzed under the effects of sudden change in wind loads caused by two trains passing each other and a train entering and leaving the wind barrier section of the bridge.The results show that the effects of sudden wind load change caused by the trains passing each other had less effects on the running safety of the leeward-side train than the wind shielding effect caused by the windward-side train in the wind speed range of 10−25 m/s.With the decrease in the porosity of wind barriers,the effects of the sudden wind load change played an increasingly important role in the running safety and comfort of the train.With the increase in wind speed,the lateral response of the train increased obviously because of the effects of sudden wind load change,which affects both the lateral running stability and the comfort of the train.
为了研究侧风下风载突变效应对桥上列车走行性的影响,以某公铁平层大桥为研究背景,通过一系列车桥组合节段模型风洞试验,测试了桥上双车交会以及车辆进出风屏障两种情况下列车和桥梁的气动力系数。基于改进的SIMPACK与ANSYS刚柔耦合仿真分析方法,建立了风-双线列车-轨道-桥耦合系统模型,分析了桥上双车交会和列车进出风屏障时风载突变效应对列车动力响应的影响。结果表明:在10~25 m/s风速范围内,双车交会引起的风载突变效应对背风侧列车安全性的影响要小于迎风侧列车的遮风效应。随着风屏障透风率的减小,风载突变效应对列车行车安全性与舒适性的影响越来越占据主导作用。随着风速的增大,风载突变效应引起的车辆横向响应明显增大,影响列车运行时的横向平稳性与舒适度。
作者
HAN Yan
LIU Ye
CAI Chun-sheng
HU Peng
HE Xu-hui
韩艳;刘叶;蔡春声;胡朋;何旭辉(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410004,China;School of Transportation,Southeast University,Nanjing 211189,China;School of Civil Engineering,Central South University,Changsha 410075,China)
基金
Projects(51822803,51878080,51778073) supported by the National Natural Science Foundation of China
Projects(2020JJ3035,2018JJ3538) supported by the Hunan Provincial Natural Science Foundation of China。
