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为研究重载铁路路桥过渡段在轴重增大、速度提高情况下的变形和动力响应,本文采用有限元数值计算方法,系统总结了重载铁路路桥过渡段路基纵向动力响应规律。分析表明:轴重的变化是影响动应力峰值的决定性因素;列车上桥时,动位移在距桥台0~25m范围内比较集中,变化明显,在该范围内动位移先增大,后减小,在15m左右位置动位移达到最大值。25t轴重、速度100km/h时,桥两侧点的加速度峰值均显著增加;尤其速度提高到120km/h后,影响更甚;上桥侧过渡段路基表面动位移和加速度峰值变化受轴重等因素的影响较下桥侧明显。
In order to study the deformation and dynamic response of the transitional section of heavy haul railway road and bridge at increasing axle load and increasing speed, this paper summarizes the longitudinal dynamic response of the subgrade of the transitional section of heavy haul railway by using finite element method. The analysis shows that the change of axle load is the decisive factor that affects the peak value of dynamic stress. When the train is on the bridge, the dynamic displacement is concentrated in the range of 0 ~ 25m away from the abutment, and the change is obvious. In this range, the dynamic displacement first increases, Small, in the position of about 15m to reach the maximum displacement. 25t axle load, speed 100km / h, the peak acceleration of both sides of the bridge are significantly increased; especially when the speed is increased to 120km / h even more affected; on the bridge side of the transitional section of the road surface dynamic displacement and peak acceleration changes by the axial load The impact of other factors than the side of the bridge is obvious.