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为了求解高速铁路竖向振动荷载时程问题,在用Newmark 法求解运动平衡方程的基础上,推导了求解振动荷载的公式,提出了由振动加速度反求振动荷载时程的动力有限元方法。结合秦沈客运专线,计算了列车运行速度分别为230 km/h和265 km/h时的列车竖向振动荷载时程。发现列车运行速度提高了35 km/h时,列车竖向振动荷载最大值增加了16 34 kN。结果表明由实测振动加速度可以反求振动荷载,该方法可行。
In order to solve the problem of vertical vibration load time scale of high-speed railway, the formula of solving the vibration load is deduced based on the Newmark method, and the dynamic finite element method is proposed to reverse the vibration load time history from the vibration acceleration. Combined with Qin-Shen Passenger Dedicated Line, the vertical train vibration time history of train was calculated when the train running speed was 230 km / h and 265 km / h respectively. When the train running speed was increased by 35 km / h, the maximum vertical vibration load of train increased by 16 34 kN. The results show that the measured vibration acceleration can reverse the vibration load, this method is feasible.