Numerical simulations and experimental validations on aerodynamic effect of wind barriers on train-bridge system
This paper investigates the effect of a wind barrier on the aerodynamic performance of a train-bridge system under crosswind using a numerical simulation method.The studied bridge is a long-span cable-stayed railway bridge with a flat steel box girder in Chongqing,China.The flow field around the train-bridge system with and without a wind barrier is numerically simulated.Wind barrier porosities varying from 10%to 60%are evaluated.The tri-component coefficients of the train,bridge,and train-bridge system are obtained and investigated in detail.The effect of the wind barrier on the aerodynamics of the train-bridge system is revealed through determination of the aerodynamic forces,pressure mapping,and flow visualization.The results show that a wind barrier successfully decreases the mean velocity above the girder and consequently decreases the drag force and moment on the train; however,the wind barrier also significantly increases the drag force on the bridge deck.Therefore,installation of a wind barrier improves the running safety of the train but is detrimental to the wind resistance of the bridge.Additionally,the efficiency of the wind barrier depends on the porosity.A lower porosity improves the train safety but is detrimental to the bridge safety.An optimal wind barrier porosity of 30%is obtained based on the aerodynamic forces of both the train and bridge.
Wind barrier train-bridge system crosswind optimal porosity aerodynamic coefficients
Lei Zhou Xuhui He Haiquan Jing
National Engineering Laboratory for High Speed Railway Construction,Changsha,410075,China;School of Civil Engineering,Central South University,Changsha,410075,China;Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Changsha,410075,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
1104-1111
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）