Bridge Damping Extraction Method from Vehicle–Bridge Interaction System Using Double-Beam Model

When vehicles interact with a bridge, vehicle–bridge interaction (VBI) system is created. The frequency and modal shape of VBI systems have been widely studied, but the damping has not adequately investigated. In recent years, several incidents abnormal bridge vibration due to changes in occurred aroused widespread concern society. Damping an important evaluation index structural dynamic performance. Knowing ratio useful for analyzing while service. This paper presents method extract values from system, which can serve as guide evaluation. First, double-beam theoretical model was used simplify cases involving uniform traffic flow. equation simplified obtained using extended stiffness (EDSM). A finite element were established. ratios two models separately calculated then compared results. results verified accuracy method. explains that be extracted by estimating equivalent flow parameters formula system. this engineering case ranged 0.75% 0.78%, smaller than range directly identified monitoring data (0.83–1.19%). show effectively improve identification.