Life-cycle seismic resilience of aging bridges and road networks considering bridge capacity correlation

The definition of proper design, maintenance, and management policies for aging structural facilities is a strategic priority for communities exposed to multiple natural hazards. In this paper, the probabilistic life-cycle seismic resilience of aging bridges and road networks is investigated by means of a congestion-based performance measure. The level of structural deterioration and seismic damage associated with different limit states is related to traffic restrictions that are progressively removed depending on the recovery times of each bridge in the network. This approach is applied to reinforced concrete (RC) bridges exposed to chloride-induced corrosion and different earthquake scenarios in terms of magnitude and epicenter location. Simple road networks with series and parallel bridge configurations are investigated considering different levels of bridge seismic capacity correlation. The results show the effectiveness of the proposed framework in quantifying the detrimental combined effects of bridge structural deterioration and seismic damage and the influence of bridge seismic capacities correlation on the life-cycle resilience of road networks with different connectivity patterns.