Probabilistic life-cycle resilience assessment of aging bridges and road networks under seismic and environmental hazards

This paper presents a probabilistic framework for life-cycle resilience assessment of aging bridges and transportation road networks under seismic and environmental hazards. The time-variant fragilities and damage probabilities of the deteriorating bridges in the network are evaluated by considering the role of the seismic scenario in terms of earthquake magnitude and epicentral distance. The effects of structural deterioration, seismic damage, and post-event repair actions under uncertainty are related to traffic restrictions applied over the network. Traffic analysis is hence carried out to assess in probabilistic terms the network functionality profiles, the corresponding resilience levels, and a damage-based measure of life-cycle resilience. The proposed framework is applied to reinforced concrete bridges exposed to chloride-induced corrosion and simple road networks with a single bridge or two bridges in series under different earthquake scenarios.