Integrating Resilience Assessment into Life-Cycle Management of Civil Infrastructure

Dan M. Frangopol, David Y. Yang

In its life-cycle, civil infrastructure is subjected to both progressive deterioration due to environmental and mechanical stressors and sudden performance drop due to natural and manmade hazards. Traditionally, life-cycle management of civil infrastructure deals only with the threat posed by progressive deterioration. This lecture introduces a novel approach developed to integrate hazard analysis, risk assessment, and resilience analysis into life-cycle management. The proposed approach pivots on the concept of lifetime resilience in which deterioration-induced and hazard-induced performance losses of structures are integrated. By modeling life-cycle intervention cost, life-cycle failure risk, and lifetime resilience loss as renewal-reward processes, an efficient, resilience-informed life-cycle management framework has been developed to conduct multi-objective optimization of intervention actions for civil infrastructure. The proposed approach and the developed life-cycle management framework are illustrated by a generic example of a deteriorating structure. Multi-objective genetic algorithm is used to determine the optimal trade-offs of life-cycle intervention cost, life-cycle failure risk, and lifetime resilience to hazards. These optimal trade-offs are presented in a Pareto front that can directly guide decision-makers to perform integrated life-cycle management considering both deterioration and hazards.
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