Study On Dynamic Response Of Bridge Under The Impact Of Jumping

Over the past 20 years,highway transportation has been developing rapidly in China,and various kinds of bridge projects have been continuously extended.In view of the importance of safe service under the operation of bridges,and the exploration of the design and construction of new bridges to improve their excellent mechanical properties,the coupling dynamics of vehicle and bridge has always been a research field of attention of scholars at home and abroad.The phenomenon of vehicle bumping has a great influence on the dynamic response of bridges,which is an important aspect of vehicle-bridge coupling dynamics.The paper focuses on the linear and nonlinear problems of the coupling interaction of vehicle and bridge,and makes a systematic analysis and research on the dynamic responses of bridges under several typical action states and influencing factors.The main work is as follows:(1)Based on the model and method of vehicle-bridge coupling dynamic study,a new model of vehicle-bridge coupling dynamics can be established to meet the effectiveness of calculation and ensure the accuracy of calculation.The calculation and analysis model is aimed at the dynamic response of the bridge under the action of the vehicle bridge,and emphasizes the full consideration of the detailed study and analysis of the whole process of the car jump.(2)Based on the linear dynamic equation set description of the vehicle-bridge coupling dynamic system,through the Newmark-? integral method,the response of the bridge to the middle span displacement response under the influence of different high jump,different speed,different bridge deck smoothness and different bridge structure damping are calculated and analyzed.The law and characteristics of bridge dynamic response are obtained.(3)Considering the actual nonlinearity of vehicle tire based on the contact effect of vehicle tires.The height and position of different vehicle jumping height and position are discussed through the nonlinear simulation of tire pressure,the stiffness fitting of vehicle bridge connection based on Taylor expansion,the improvement and establishment of the bridge coupling nonlinear dynamic equation and the introduction of the numerical solution method of "new prediction correction integral".The dynamic response of the bridge under the condition of vehicle speed is calculated and analyzed,and compared with the linear equation description of vehicle-bridge interaction,some meaningful results and conclusions are obtained.