桥梁表面不平顺对车-桥耦合振动系统动力效应的影响

利用模态分析法以及时变力学系统的求解方法,考虑桥面不平顺产生的随机激励,以简支梁桥为对象,计算了四自由度模型车辆-桥梁耦合系统的动力效应,讨论了不同等级桥面平整度情况下桥梁冲击系数、车辆垂直加速度、车轮对桥的作用力的变化规律。结果表明,随着不平整度系数逐渐增大,冲击系数逐渐增大;平整度较差等级的桥面,车辆垂直加速度较大,车轮对桥的作用力也较大。

Dynamic Behavior of Coupled Vehicle-Bridge Systems Considering Bridge Surface Roughness

The surface irregularity of bridge is modeled as a random exitation.The coupled vibration partial differential equation of a four-degrees of freedom vehicle and bridge system are derived,the coupled dynamics responses of the time-varying system are solved with modal analysis and Newmark method.The dynamic behavior of vehicle and bridge due to random surface irregularities of the bridge is investigated.The rear wheel load on a bridge are given with different surface roughness.The vertical acceleration of the vehicle is presented considering the different surface roughness and the dynamic responses of the bridge are simulated.