基于不同载重与车速的简支梁桥动力响应

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

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0.028,0.049m.随着车辆速度增加,简支梁桥跨中挠度在车速60km/h时达到峰值,此时桥梁与车辆产生共振.

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.