Seismic resilience of aging bridges and evolving road networks

This paper investigates the seismic resilience of aging infrastructures and presents a probabilistic approach to life-cycle seismic assessment of concrete bridges exposed to corrosion and resilience analysis of evolving road networks under prescribed earthquake scenarios. The seismic demand is evaluated for each bridge in the network based on a ground motion prediction equation in terms of earthquake magnitude and epicentral distance. The corresponding levels of seismic damage are derived from the bridge time-variant fragilities and related to vehicle restrictions and traffic limitations. Finally, a traffic analysis of the road network is carried out to compute both the time-variant system functionality and life-cycle seismic resilience under prescribed post-event recovery processes considering the evolution over time of the road network.