Abstract:Given that the vulnerability evaluation of bridges is indispensable for traffic hazard assessment, it is of practical significance to study the seismic vulnerability of bridges. Aiming to improve the accuracy of the current seismic vulnerability analysis methods of bridges, this study proposes a seismic vulnerability assessment model of reinforced concrete bridges based on fuzzy evaluation. The uncertain parameters in the bridge evaluation process are analyzed from the aspects of the bridge structure level, material level, and boundary layer. Based on the analysis results, considering that bridge loss is a relatively fuzzy concept, the fuzzy evaluation method in fuzzy mathematics is introduced to evaluate the seismic vulnerability of bridges. The damage analysis of bridge supports under displacement, the damage analysis of piers under energy, and the overall damage analysis of bridge structures under a certain period are combined. Then a multi-level fuzzy vulnerability assessment model is constructed. The experimental results show that in the longitudinal direction, only slight damage occurs, and the probability of slight damage in this direction is small. In the transverse direction, the probability of slight damage is higher, and moderate damage may even occur. Under earthquake action, the bridge damage is mainly slight failure and moderate failure, and the probability of serious damage is very small.