车-桥耦合振动冲击效应对简支板的影响

Impact influence of vehicle-bridge coupled vibration on simply-supported slab

为研究车-桥耦合振动对简支板的影响,基于分离迭代法将车-桥耦合振动系统分成车辆和桥梁2个子系统,采用Newmark-β逐步积分法求解车桥的运动学方程。用Ansys软件建立简支板模型,计算分析了不同板厚和5种路面不平度板与车辆的耦合振动。结果表明:板厚对桥梁的竖向位移响应影响较大,较薄的板在车辆荷载作用下将产生较大的竖向位移,反之亦然;而路面不平度对桥梁耦合振动的影响比较明显,随着路面等级变差,桥梁的竖向位移响应和冲击系数都随之增大;桥梁结构局部部位对耦合振动的反应也是不一致的。

For research the vehicle-bridge coupled vibration affect on simply-supported slab. Based on the separated iterative method,the vehicle-bridge coupled vibration system was divided into two subsystem,one for the vehicles and other for the bridge structure,Newmark-β method is used to work out the kinematics equation of vehicle-bridge coupled vibration. Simply-supported slab model was established by Ansys,taking into account of different slab thickness and bridge surface roughness,vehicle-bridge coupled vibration was calculated and analyzed. The results show that slab thickness obvious influence on vertical deflection,the thinner slab would generate the larger deflection with vehicle load,and vice versa; bridge surface roughness significant affect on vehicle-bridge coupled vibration,the worse surface roughness would generate the larger deflection and impact factor; influence of vehicle-bridge coupled vibration on local bridge position were not same.