Dynamic Response Analysis of Rigid Frame Continuous Composite Beam Bridge Based on Vehicle-Bridge Coupling
In order to study the impact of vehicles on the dynamic response of a long span rigid frame con-tinuous composite beam bridge,the dynamic response of its main beam and the variation of its dynamic impact coefficient were investigated.Based on vehicle dynamics and modal superposition method,a 15 de-gree of freedom spatial five axle load truck was established.Taking a three span(95 m+150 m+95 m)rigid frame continuous composite beam bridge as the engineering background and based on the displace-ment and mechanical coupling relationship between the vehicle and the bridge,a vehicle bridge coupling vibration response solution program was compiled in MATLAB,and the influence of parameters such as vehicle weight,bridge deck irregularity and bridge damping ratio on the dynamic response of rigid frame continuous composite beam bridges was also studied.The results show that the displacement of the main beam increases with the increase of vehicle weight,and the dynamic impact coefficient decreases with the increase of vehicle weight.Pavement roughness has a significant impact on bridge vibration,and the am-plitude of displacement,internal force,and dynamic impact coefficient increase with the decrease of pave-ment grade.The bridge damping ratio has a significant impact on the displacement and internal force of the bridge,and the amplitude and dynamic impact coefficient of the displacement and internal force de-crease with the increase of the bridge damping ratio.
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