Vibration Of Vehicle-curved Bridge Coupling System And Dynamic Analysis

With the continuous development of the city,straight bridges have shown some shortcomings of inflexibility in urban construction,and curved bridges gradually act as part of the bridge.Considering that the curved bridge is mainly subjected to vehicle loads during its service,the vehicle-bridge coupled vibration of the curved bridge and its dynamic behavior analysis are the main content of this article.The purpose is to calculate a series of mechanical problems such as the dynamic response of curved bridges under the coupling vibration of vehicle and bridge,so as to provide a certain theoretical basis for related engineering problems.The content is as follows:This paper connect the vehicle model and the curved bridge model through the tire dynamic load,establish a vehicle-curved bridge coupling system,and study the dynamic behavior of the vehicle and the curved bridge based on this coupling system.The force between the tire and the bridge deck adopts a point contact model.The vehicle considers linear and non-linear,variable speed driving,and the curved bridge considers the bridge deck irregularity.The vibration control equation of the curved bridge is derived based on the Vlasov equation.The dynamic response of curved bridge and vehicle is studied by hypothetical mode method,Galerkin method,integral transformation method and Newmark method.Experiments are used to verify the correctness of the calculation results.The study found that because of the short running time of vehicle on the bridge,the calculated high-order modes have little effect on the results of this paper and can be ignored.Therefore,the external load mainly excites the first-order vibration mode of the curved bridge.The calculation and experiment simulation in this paper consider the first-order mode function approximation of the curved bridge.Factors such as vehicle acceleration,non-linearity,and bridge deck irregularities have a certain impact on the dynamic response of curved bridge and vehicle.Reducing vehicle load,tire stiffness,suspension stiffness,and increasing bridge damping can improve vehicle comfort and reduce bridge damage.The non-linearity of the vehicle body suspension has a greater impact on the vertical acceleration and displacement of the vehicle body,and has a small impact on the vertical acceleration of the curved bridge.The acceleration of the vehicle will have a great impact on the centrifugal force of the curved bridge due to the change of the vehicle speed,which will have a greater impact on the radial and axial vibration of the bridge.The unevenness of the bridge deck will increase the vibration response of the bridge and the vehicle in the vehicle-curved bridge coupling system.