基于ANSYS的桥梁强迫振动分析

Compulsive vibration analysis of bridge based on ANSYS

针对桥梁震动分析中的桥梁(主要指公路桥)在移动车辆荷载作用下震动的古典问题,运用有限元方法并借助大型有限元分析软件ANSYS中的二次开发语言APDL进行分析。分析了匀速常量力作用下和匀速移动简谐力作用下的情况,仿真结果说明用ANSYS分析的结果与经典桥梁震动分析的理论近似解吻合很好。讨论车辆质量与桥梁质量相比较小的情况,忽略了移动荷载的质量,避免了变系数微分方程求解的困难。

The problem of the bridge's vibration(mainly Road Bridge)is discussed in this article,based on finite element method and language of ANSYS.Two cases:are one is the constant force,the other is the harmonic quantity force.The result keeps well consistent with the mainly discussed solution.The ratio of the mass to the vehicle and the bridge is very small,so we overlook the mass of the vehicle.In this way we avoid the difficulty of solving the variable coefficient differential equation.