摘要
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。
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.
出处
《交通运输工程学报》
EI
CSCD
北大核心
2005年第1期36-38,共3页
Journal of Traffic and Transportation Engineering
关键词
高速铁路
振动荷载
有限元
动力反分析
Dynamic loads
Elasticity
Finite element method
Mathematical models
Stiffness matrix
