Application of MCEER Fragility-Based Decision Support Methodology to a Benchmark Hospital

Abstract eng:
A methodology is presented for calculating the seismic performance of structural/nonstructural systems in a health care facility and developing rational strategies for increasing the seismic resilience of these systems. The methodology is based on (i) seismic hazard analysis, (ii) fragility analysis and (iii) life-cycle capacity and cost estimation. Systems seismic performance is measured by fragility surfaces, that is, the probability of system failure as a function of moment magnitude and site-to-source distance of a seismic event, consequences of system damage and failure, and system recovery time following seismic events. The input to the analysis consists of site seismic hazard, structural/nonstructural systems properties, performance criteria, rehabilitation strategies, and a reference time. Estimates of losses and recovery times, referred to as life-cycle losses and recovery times, can be derived using fragility information, financial models, and available resources. MCEER West Coast Demonstration Hospital is used to demonstrate the method. The seismic risk of the MCEER Hospital is assessed based on the performance of its structural system and three nonstructural systems attached to the structural system at different locations, namely, the Heat-Ventilation-Air-Conditioning system, piping system and partition walls. Fragilities are obtained for the structural and nonstructural systems for several limit states. Also, statistics are obtained for life-cycle losses and recovery times corresponding to different rehabilitation strategies and an optimal rehabilitation strategy is selected using these statistics.

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