Analysis Of Dynamic Response Of Steel-Concrete Composite Girder Bridge Deck Pavement Under Vehicle Load

The bridge deck pavement directly bears the role of vehicle load.The dynamic effect of vehicle bridge coupling vibration system makes the bridge deck pavement more likely to be damaged.The damage of bridge will also lead to the aggravation of vehicle vibration,which affects the safety of driving and the comfort of driving.The traditional standards and calculation methods often use the static method to study the vehicle bridge coupling system,ignoring the influence of the vehicle acceleration changes on the system.In order to objectively and truly reflect the objective and real working conditions between the vehicle and the bridge,and fully consider the interaction between the vehicle and the bridge,this paper takes a three-span steel-concrete composite girder deck pavement as the research object,through finite element simulation Some researches are made on the dynamic characteristics and dynamic response of the bridge deck pavement when the parameters of the vehicle-bridge coupling system change.Firstly,the finite element software ABAQUS combined with vehicle dynamics theory is used to simplify the modeling of the vehicle subsystem,and the optimization modeling of the bridge subsystem is carried out based on the elastic layer theory.By setting the contact relationship between the vehicle and the bridge,the coupling vibration between the vehicle and the bridge is objectively simulated,and the vehicle bridge coupling vibration system model is established.Secondly,the evaluation index of the dynamic model of the vehicle bridge coupling vibration system is determined.The actual data of the bridge evaluation index can be obtained by modal test and dynamic load test.The correctness of the finite element model is verified by comparing the simulation results of the finite element model of the vehicle bridge coupling system with the field test results.Finally,the deflection,stress,and strain of the bridge deck pavement are used as indicators to determine vehicle speed changes,load changes,vehicle suspension system damping changes,vehicle driving position changes,vehicle load application methods,and bridge elastic modulus,bridge damping,and with the influence of factors such as crack development,the central difference method is used to solve the dynamic response of the bridge structure,so as to provide theoretical suggestions for the design,construction,operation and maintenance of the bridge.The results show that the finite element model of deck pavement under vehicle load is established by using the actual parameters of the bridge.Generally speaking,when the vehicle speed,load,suspension system damping change and the bridge elastic modulus change,the dynamic response of the bridge deck pavement is nonlinear.At the same time,the deflection,the anisotropic stress and strain near the vehicle action position are relatively large.Moreover,the dynamic response of the whole vehicle model is more obvious than that of the quarter vehicle model.In addition,the development of cracks on the subgrade on one side of the bridge has little effect on the mechanical response of the bridge deck pavement.