Flood resilience analysis framework for bridge networks considering the impact factor of climate change scenarios

Global climate change has significantly increased extreme rainfall events, placing higher demands on the flood resistance capabilities of bridge networks. However, existing research always focus on the structural degradation under climate change scenarios only, not combining the variation of flood intensity. For this purpose, this study is aimed to establish the framework of flood resilience analysis for bridge networks, comprehensively considering the structural degradation and hazard evolution. Firstly, the structural degradation model is established through existing corrosion model and modified by measured corrosion data inspected from real functionality bridges in China. Then, the flood hazard curves corresponding to different climate change scenarios are illustrated based on the prediction of extreme rainfall events. The total risk and resilience of flood-induced failure can be finally obtained by convoluting hazard and fragility curves. The results indicate that the flood resilience of bridge network is closely related to the structural resistance, service condition, carbonation emission scenario and network characters. Under the combined effect of structural degradation and hazard evolution, the increase of total failure risk caused by climate change can not be neglected. Thus, the framework proposed in this study may be more suitable for the risk analysis and reasonable retrofitting decision making.