基于不同载重与车速的简支梁桥动力响应

采用振型分解法求解车桥耦合振动方程，分析简支梁桥在不同载重和车速作用下的动力响应.车辆采用1/2车模型，简支梁桥采用欧拉梁，建立车桥耦合振动方程，运用Ansys软件，得出简支梁桥跨中挠度变化曲线.结果表明，车辆载重的增加导致桥梁跨中挠度增加，车辆标准载重及车辆超载100%时跨中挠度分别为0.028，0.049 m.随着车辆速度增加，简支梁桥跨中挠度在车速60 km/h时达到峰值，此时桥梁与车辆产生共振.

Simply-Supported Beam Bridge’s Dynamic Response to the Different Vehicle Speed and Loaded

Using modal decomposition method for solving vehicle-bridge coupling equation to analyze the dynamic response of the simply-supported beam bridge to different vehicle load and speed.The half car model was used  as vehicle,and  Euler-Bernoulli beam was used as the simply-supported beam bridge.Using the ANSYS software,the simply-supported beam bridge span deflection curve was obtained.The results show that vehicle load increase  made the bridge span deflection increase;the beam’s span deflections were 0.028 m and 0.049 m respectively  in the  standard vehicle load and 100% vehicle overload.As the vehicle speed increased,the simply-supported beam bridge span deflection reached at its peak value at the vehicle speed of 60 km/h and vehicle-bridge resonance was resulted in.