Coupling Vibration Study Of Vehicle-Bridge For Highway Bridges

Dynamic response of bridge structure is an important subject of the bridge research field. Predecessors have affirmed both on theoretics and practice that the vehicle moving loads would lead to more deformation and stresses for bridge structure than the equivalent static loads. With the rapid development of modern highway communication, and new bridges being built, its dynamic problem should not be neglected when subjected to vehicle moving loads.When vehicle passes, it has been attracted widespread attention due to its close relation to practical applications. This dissertation, based on the reference to kinds of literature, is presented with a concise review on vehicle-bridge vibration. Based on summarizing and absorbing the achievement of the pioneer works, the coupling vibration of vehicle-bridge system is studied, and the main research work is as follows:(1) For the even simply supported beam, the coupling vibration model of the vehicle-bridge system is derived on research object, and theory analysis research of moving vehicle to the bridge is given.(2) By the simplified model of vehicle-bridge, analysis response to the vehicle-bridge system when the moving vehicle pass the bridge with characteristic road roughness.(3) It is primarily discussed that the nonlinear factors have some effect on the dynamic behavior of vehicle-bridge when the moving vehicle pass the bridge with characteristic road roughress.To consider the coupling vibration system equation under the vehicles nonlinear characteristic, this dissertation adopt the Newmark forecast-emendation integral method. It discussed the influence of vehicle, surface roughness of bridge, the nonlinear suspension factors etc. on the dynamic impact coefficient.Based on the coupling vibration characteristic of vehicle-bridge system, we hope that the analysis solutions can supply some reliable reference result to the design and work method of engineering structures.