Role of the earthquake scenario on life-cycle seismic resilience of aging bridge networks

The time-variant structural capacity of critical infrastructure facilities is an important performance indicator in the definition of reliable policies for emergency management and long-term planning of risk mitigation strategies. This paper investigates the seismic resilience of transportation road networks based on a probabilistic framework for life-cycle seismic assessment of deteriorating bridges under prescribed earthquake scenarios with different magnitude and epicenter location. The seismic damage suffered by the exposed bridges and the effects of repair actions are related to traffic limitations and vehicle restrictions implemented over the network. The life-cycle seismic resilience is evaluated under post-event structural recovery of each bridge processes and functionality restoration of the network traffic capacity. The proposed framework is applied to reinforced concrete bridges exposed to seismic hazard and chloride-induced corrosion in a highway network with detour and re-entry link. The results emphasize the role of network topology, earthquake scenario, and time-variant structural deterioration of spatially distributed bridges on the life-cycle functionality and seismic resilience of aging road networks.