Research on the Damping Ratio Variation of Vehicle Bridge Interaction System Based on the Complex Mode Method
IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and HarmonisationIABSE Congress Reports（2022）
Vehicle-bridge interaction (VBI) is a classical problem in bridge structural health monitoring (SHM), and there are many studies on this problem. However, most of the studies have focused on the frequency of VBI systems and neglected the damping. In this paper, the effects of vehicle parameters on the damping ratio of VBI systems are investigated. First, the equations of motion (EOM) of the VBI system are given. Then the damping ratios of the VBI system are solved by the complex mode method, and the results are verified by numerical simulation. Finally, the effects of vehicle parameters on the damping ratio of the bridge are analyzed. The results show that the speed, position, mass, frequency, and damping ratio of the vehicle will affect the damping ratio of the VBI system. When the vehicle frequency is close to the resonance condition, the change of damping ratio of the bridge is not negligible.
