【摘要】 对正线列车高速通过进站人行天桥时,人行天桥在列车风荷载作用下的振动响应进行了研究。根据时均化的Reyholds平均Navier-Stokes方程进行湍流数值模拟,并选取RNGk-ε湍流模型完成N-S方程的闭合,采用计算流体动力学分析软件Fluent完成高速列车过站时的三维紊态外流场的模拟,从而得到列车高速通过人行天桥时,作用在天桥表面上的风荷载时程曲线。最后通过有限元分析软件Ansys将已模拟的列车风荷载作用在人行天桥的表面,得到人行天桥的振动响应。结果表明,当列车高速通过进站人行天桥时,列车风对人行天桥的舒适度影响较大。更多还原

【Abstract】 Vibration responses of footbridge induced by wind pressure generated by main line train were investigated.Firstly,turbulent numerical simulation was carried on according to time-filtered Reynolds averaged Navier-Stokes equations,meanwhile the RNGk-εturbulent model was selected to close N-Sequations.Then,three-dimensional incompressible unsteady flow computational fluid dynamics model was established by computational fluid dynamic software Fluent.After that,time histories of wind pressure on the surface of footbridge were obtained when high-speed train passed through the station.Finally,the wind pressure was applied on the footbridge by finite element analysis software Ansys,thus vibration response of footbridge was obtained.Simulating results show that wind pressure caused by train has an obvious effect on the comfort of footbridge when high-speed train passes through the station.更多还原