Aerodynamic interference effects between a triple-box girder and trains on aerodynamic forces and vortex-induced vibration  

分离式三箱梁与列车间气动干扰效应对气动力系数及涡振性能的影响

作　　者：YANG Ling-bo HUA Xu-gang WANG Chao-qun HE Dong-sheng CHEN Zheng-qing 杨凌波;华旭刚;王超群;何东升;陈政清(Key Laboratory forWind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China;China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]Key Laboratory forWind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China [2]China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430050,China

出　　处：《Journal of Central South University》2022年第8期2532-2541,共10页中南大学学报（英文版）

基　　金：Project(52025082) supported by the National Natural Science Foundation for Distinguished Young Scholars of China;Project(CX20190288) supported by Hunan Provincial Innovation Foundation for Postgraduate,China。

摘　　要：Wind tunnel tests were carried out to investigate the aerodynamic interference between a triple-box girder and trains,involving static aerodynamic forces and vortex-induced vibrations(VIVs).Static and dynamic sectional models of the girder and trains were employed for aerodynamic force measurement and VIV test,respectively.Results indicate that the aerodynamic interference effect on static aerodynamic forces of both the girder and trains is remarkable.When a single train exists,the horizontal position of the train has a small effect on aerodynamic coefficients of the girder.When two trains meet on the girder,the drag coefficient of the girder is significantly reduced compared with that of without train or with a single train;besides,during the whole meeting process,aerodynamic forces of the leeward train first drop and then increase suddenly.The fluctuation of aerodynamic force could cause redundant vibration of the train,which is unfavorable for safety and comfort.A train on the girder could worsen the girder VIV performance:a new vertical VIV appears in the triple-box girder when a train is on the girder,and the torsional VIV amplitude increases significantly when the train is on the windward side.为了研究列车与分离式三箱梁之间的气动干扰,进行了一系列风洞试验,重点研究了气动干扰对主梁和列车的三分力系数及主梁涡振性能的影响。采用列车和主梁的节段模型进行静力三分力测试和涡振试验。结果表明分离式三箱梁与列车之间存在显著的气动干扰效应。当单列车存在时,列车和主梁之间的相对水平位置对主梁的三分力系数影响不大。当双列车会车时,主梁的阻力系数较无列车和单列车时显著减小,且背风侧列车受到的气动力先突降后陡增,气动力的剧烈波动会引起列车的振动,对行车安全及舒适性不利。停靠在主梁上的列车对分离式三箱梁的涡振性能产生不利影响,会引起分离式三箱梁新的竖向涡振,且当列车位于迎风侧轨道上时,主梁扭转涡振振幅显著增加。

关 键 词：triple-box girder wind tunnel test train-girder system aerodynamic interference vortex-induced vibration 

分 类 号：U441[建筑科学—桥梁与隧道工程] U270.1[交通运输工程—道路与铁道工程]