With the upgrading of urban planning and construction, resilient city construction has gradually become an important proposition to promote urban sustainable development. Resilient disaster prevention is its main content, in which the seismic resilience of lifeline bridge is particularly important. This paper conducts the seismic fragility analysis of a three-tower cable-stayed bridge to assess its seismic performance and facilitate the subsequent seismic resilience evaluation of the cable-stayed bridge. The finite element model for the bridge is established using OpenSees platform. The fragility curves of the main components of the bridge are established by adopting the fragility model based on incremental dynamic analysis (IDA), and the fragility of the whole bridge is evaluated using the narrow bound method. The results show that the tower is the most fragile component, while the failure probability of the cable is relatively low. The failure of the whole bridge is mainly determined by the tower.
The road transportation system is an important part of lifeline engineering and plays a vital role in supporting and guaranteeing the post-earthquake rescue and disaster reconstruction process. Mountainous cities in southwest China are earthquake-prone areas. The earthquake-induced fault misalignment, landslide and collapse cause severe damage to the transportation system, so the emergency preparedness of the transportation system is the top priority for earthquake defense. This paper constructs a disaster scenario model of road traffic networks in mountainous cities through seismic damage assessment and landslide hazard assessment of road traffic infrastructure to provide a reference basis for emergency capability assessment and emergency defense planning.
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