Risk-based framework for post-earthquake monitoring and evaluation of reinforced concrete bridges subject to multiple hazards

This paper describes a probabilistic approach to determine optimal monitoring strategies for post-earthquake damage estimation of aging reinforced concrete bridges. Various monitoring strategies are considered, including different inspection parameters, techniques and inspection intervals. Parameters include fundamental mode period, crack width, and residual displacement. Incremental damage is estimated by comparing the post-event measurement of a particular parameter of the structure with the most recent information available. Monte Carlo simulation is used to generate sequences of hazards, including earthquakes, corrosion and scour, and their joint (interacting) effects on bridges. Applications of the framework are described for a typical multiple-column pier and simply-supported deck concrete bridge, as is common in the Central and Southeastern United States. The objective function considered for risk-informed post-earthquake monitoring of bridges can vary depending on the actual condition of the bridge and its safety requirements. Our methodology prioritizes maximizing damage prediction accuracy, which suggests different optimal monitoring planning throughout the life of the bridge.