列车荷载作用下高速铁路矮塔斜拉桥动力分析

为分析不同列车速度对大跨度矮塔斜拉桥的动力响应,以新建福厦客专雷公山特大桥为背景,基于midas civil建立该桥的有限元模型。根据中国高速铁路客车机车CRH380A的相关参数,利用移动荷载时程分析模拟列车过桥时的荷载。分析不同工况下主梁以及桥塔,斜拉索应力的动力响应。结果表明：车辆行驶方式和车速对桥梁动力响应有较大影响,车速越高,桥梁的动力响应越明显。且其响应峰值满足相关规范要求,说明列车在250～400 km/h速度区间运行时桥梁结构刚度满足,振动状态良好。

Dynamic analysis of low tower cable-stayed bridge of high speed railway under train load

In order to analyze the dynamic response of the long-span low-pylon cable-stayed bridge with different train speeds, the finite element model of the newly-built Fuxia passenger dedicated railway LeiGongShan Bridge was established based on Midas Civil based on the background. According to the relative parameters of passenger locomotive CRH380A in China''s high-speed railway, the load of the train crossing the bridge was simulated by using the time-history analysis of moving load. The dynamic response of stress of main girder, bridge tower and cable under different working conditions were analyzed. The results show that the driving mode and speed of vehicles have a great influence on the dynamic response of the bridge, and the higher the vehicle speed, the dynamic response of the bridge is more obvious. And its response peak meets the requirements of relevant codes, indicating that the bridge structure stiffness is satisfied and the vibration state is good when the train runs in the speed range of 250km/h~ 400km /h.