风-汽车-桥梁系统空间耦合振动研究

为了考虑侧风引起的车轮相对于桥面的侧向相对滑动,在车轮与桥面之间引入了一个特殊阻尼器,这个阻尼器的阻尼系数依赖于车辆与桥梁的竖向耦合运动。在综合考虑路面粗糙度、车辆悬挂系统以及车轮相对于桥面侧向相对滑动的基础上,提出能够考虑桥梁的静风响应、抖振响应、汽车-桥梁耦合振动、系统的时变特性以及结构几何非线性和气动荷载非线性影响的风-汽车-桥梁系统空间耦合振动分析模型,编制了相应的分析程序。该程序既可以预测不同路面粗糙度,车速以及干、湿、雪、冰路面状况下行驶于桥梁上车辆的行车安全性,也可以评价低风速下车辆驾驶舒适度以及侧风和车辆移动荷载对桥梁振动的影响。

Three-dimensional coupling Vibration of wind-vehicle-bridge systems

A special damper, with the damping coefficient being dependent on the vertical coupling vibration of the vehicle-bridge, is introduced to consider the lateral coupling of the vehicle tire relative to the bridge deck caused by crosswind. Considering road surface roughness, vehicle suspension, and the sideslip of the vehicle tire relative to the bridge deck, a state of the art three-dimensional dynamic model of the wind-vehicle-bridge coupling vibration is presented, which incorporates the effect of bridge deformation due to static wind loads, buffeting-induced bridge response, vehicle-bridge coupling vibration, wind load on vehicle, time-variation property of system, structural geometrical nonlinearity and aerodynamic nonlinearity. The dynamic analysis model is coded to the self-developed program, which can predict not only the travel safety of different road surface roughnesses, vehicle velocities and road surface conditions(dry, wet, snowy and icy), but also the ride comfort of vehicles running on long-span bridge and the influences of crosswind and moving vehicles loads on the vibration of the bridge.