高速铁路振动荷载时程的动力反分析

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230km／h和265km／h时的列车竖向振动荷载时程。发现列车运行速度提高了35km／h时，列车竖向振动荷载最大值增加了16．34kN。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。

Dynamic inverse analysis for vibration-load history of high-speed railway

On the basis of the solution for dynamic equilibrium equation utilizing the Newmark method, the formulas for calculating vibration load were derived, the dynamic finite element method for calculating vibration-load history using the measured vibration-acceleration history was put forward. Combined with the vibration-acceleration history of the field measurement in Qinhuangdao-Shenyang dedicated passenger line,the vertical vibration-load history curves were calculated when train speeds were 230 km/h and 265 km/h. It is pointed that the maximum vertical vibration load increases by 16.34 kN when train speed increases by 35 km/h. The results indicate that vibration-load history could be obtained with the measured vibration-acceleration history, the method is feasible. 4 figs, 4 refs.