【摘要】 为确定车速和风速对高速铁路桥梁车桥系统风荷载的影响,以兰新第2双线铁路32m简支箱梁和CRH2型高速列车为对象,采用Star CCM+软件建立列车和桥梁的全尺寸模型,分别对列车风场和联合风场中的车桥系统进行模拟,分析车辆风荷载和桥梁风荷载随车速和风速的变化规律。结果表明:列车风场中,随着车速的增加,车辆的侧力逐渐增大,头车和尾车的升力逐渐减小,力矩逐渐增大,桥梁的侧力、升力和力矩逐渐增大,但数值均较小;联合风场中,随着车速的增加,头车的侧力和力矩逐渐增大,尾车的升力和力矩逐渐减小,桥梁风荷载与车速的相关性相对较弱;随着风速的增加,列车的侧力和力矩逐渐增大,头车的升力先增大后减小,尾车的升力先减小后增大,桥梁的侧力和力矩逐渐增加,升力先减小后增大。更多还原

【Abstract】 To make clear the influences of the train speed and wind speed on the train-bridge system of high-speed railway bridge,a 32-m span simply-supported box girder bridge on the 2 nd Lanzhou-Xinjiang Double-Track Railway and the CRH2 high-speed train were taken as the research objects and the full-scale model of the train and bridge was set up,using the software Star CCM+.The train-bridge system in the train-induced wind field and in the combined wind field was respectively simulated and the laws of the train wind load and bridge wind load changing with the train speed and wind speed were analyzed.The results show that in the train-induced wind field,with the increase of the train speed,the lateral forces of the train gradually increase,the lift forces of the head wagon and tail wagon gradually decrease and the moment gradually increases.The lateral forces,lift forces and moment of the bridge gradually increase,but the values of the said increase and decrease are little.In the combined wind field,with the increase of the train speed,the lateral forces and moment of the head wagon gradually increase,the lift forces and moment of the tail wagon gradually decrease and the correlation between the bridge wind load and the train speed is weak.With the increase of the wind speed,the lateral forces and moment of the train gradually increase,the lift forces of the head wagon increase first and decrease then while the lift forces of the tail wagon decrease first and increase then.The lateral forces and moment of the bridge gradually increase and the lift forces decrease first and increase then.更多还原