桥梁结构随机振动分析

桥梁结构的随机振动有别于其他结构。由于车辆在桥上的位置是不断变化的，因此，即使作为输入的随机激励是平稳随机过程，车桥的动力响应也超出平稳随机过程的范围，即质量在梁上不断的运动，使系统运动方程组成为一个时变系数的二阶微分方程组，一般只能采用逐步积分的数值方法，也可以用频域法，假定其频率响应函数在瞬间不随时间变化，近似的处理这种时变性问题。

The Analysis Method of Bridge Structure Random Vibration

Random vibration of bridge structure is different from the other structure.The problem is that because location where vehicles are on the bridge is changeable,so even if random vibration as importation is stationary random process,dynamic response of vehicles is beyond the scope of stationary random process.Quality which on the beam constantly vibrate,when equations of motion of system compose of one second order ordinary differential equations of time variable coefficient.