A practical method for functional recovery analysis based on seismic resilience assessment of city building portfolios

Abstract

Enhancing the seismic resilience of city building portfolios represents a pivotal strategy for mitigating the adverse effects of earthquakes. A practical method for functional recovery analysis is proposed to quantitatively assess the seismic resilience of city building portfolios. The proposed method involves quantifying delay time and developing repair scheduling schemes. The delay time considers the dependencies of normal functioning buildings on infrastructure service availability and road accessibility. It emphasizes the varying demands of buildings for critical versus general infrastructure services. The repair scheduling scheme, conducted in two steps, employs a rational repair priority index that integrates the post-earthquake residual functionality, service capacity, and relative importance of buildings. This scheme prioritizes the repair of life-rescue-related buildings, distinguishes the repair sequence for different occupancy types of buildings, and reflects the principles of local governments in repair decision-making. The effectiveness of this practical method is demonstrated through a case study. Recovery curves are compared under different earthquake scenarios and levels of labor force constraints. The concept of normalized time is introduced to allow for a comparative assessment of seismic resilience across different recovery scenarios in a more practical manner. The results can provide valuable guidance for formulating pre-earthquake risk reduction strategies, developing post-earthquake functional recovery schemes, and constructing more resilient cities.