桥下高速行驶列车对桥梁主梁位置风环境的影响研究

摘要

The pressure and velocity fields will change greatly when the high-speed train is running through the bridge,and the intense ambient aerodynamic effects will be produced in areas around,thereby affecting the anti-wind safety of around buildings and structures.Due to the fact that there exist insurmountable technical prob-lems in using wind tunnel test,in this proposed project,the Fluent in CFD software was firstly used as the simu-lation platform with 'dynamic mesh'technology.Secondly,the UDF trains route procedures were programmed to monitor the speed and the pressure distribution through monitoring the bridge sections.Thirdly,the process when the high-speed trains cross through the bridge in different speeds was simulated under the situations of no cross-wind wind,small crosswind and the bridge design crosswind.Finally,the impact loads generated under three kinds of wind to the main section of the bridge were calculated in different crosswind speed.This paper studied the aerodynamic effects in various conditions of wind on the train to the bridge main sections,which provides a valuable reference and recommendation for bridge designers in the bridge design institution.%高速列车行驶时对周围的压力场和速度场产生强烈的变化，激烈的空气动力效应对周围环境产生一定作用，从而影响周围建筑和结构的抗风安全性。由于采用风洞试验测试手段研究此类问题在技术上尚存在难以克服的困难，因此，以计算流体力学Fluent软件为仿真平台，采用“动网格”技术，编写UDF列车行驶路线程序，对无侧风、微小侧风以及桥梁设计侧风速作用下高速列车以不同列车速度通过桥底的数值模拟，并对行车路线方向的桥梁主梁断面进行布点监测，给出高速列车通过桥底区域时的速度和压力空间分布规律，计算各侧风速、不同列车速度情况下列车风对桥梁主梁局部位置的冲击载荷，从而研究各工况下列车风对桥梁主梁的气动作用，为桥梁设计单位提供具有参考价值的结论和建议。