Probabilistic Time-Varying Seismic Resilience Assessment Method of Corroded Reinforced Concrete Buildings

Corrosion-related deterioration substantially impairs the seismic performance of coastal Reinforced Concrete (RC) buildings, rendering them more vulnerable to seismic hazards. Urban buildings require sufficient seismic resilience to endure earthquakes, minimizing losses, accelerating post-earthquake recovery, and maintaining the stable operation of cities. A probabilistic seismic resilience assessment method is proposed for corroded RC buildings, enabling scientific seismic resilience evaluation across service stages and supporting optimal life-cycle maintenance and retrofit strategies. Initially, deterioration models of concrete, steel bars, and the bond-slip effect are determined. Time-varying fragility analysis is employed to reasonably account for the deterioration impact on seismic performance at different earthquake occurrence time. Second, functionality loss assessment and recovery scheme formulation are conducted at both component and building levels. A novel dynamic resource allocation mechanism is proposed for efficient workforce deployment, particularly in resource-constrained scenarios. Simultaneously, a comprehensive methodology for total recovery time calculation is proposed, integrating the two distinct phases of preparation and post-earthquake recovery. Finally, the probabilistic time-varying seismic resilience assessment method is established, with Monte Carlo simulation utilized to capture diverse uncertainties inherent in the evaluation process. To validate the rationality of the established assessment method, an RC frame shear wall building located offshore is simulated. The results indicate that corrosion-induced deterioration significantly increases functionality loss and extends recovery time, leading to reduced seismic resilience of the building. This study underscores the imperative of integrating aging effects into the seismic resilience assessment of RC buildings, with the findings providing vital theoretical support for the corrosion-resistant strengthening of buildings in corrosive environments and offering guidance for urban renewal practices.