Deterministic Optimization Model for Budget Allocation to Seismic Risk Mitigation for Water Distribution System
Publication: Lifelines 2022
ABSTRACT
This paper presents a deterministic optimization model that can be utilized for budget allocation to implement retrofitting measures for steel and concrete water pipelines. This model can be used by decision-makers to develop budget allocation strategies and to determine which strengthening and retrofit methods are the most practical and economical to be used considering a predefined set of limitations and criteria. The deterministic model determines the optimal retrofit measures based on minimizing the pipe retrofit costs, post-earthquake replacement costs, and especially large seismic losses. The main constraints considered for this model are mitigation budget constraint, mitigation strategy constraint, and risk of especially large loss constraint. A case study is performed for a pilot area per the return of certain earthquake to demonstrate the application and practical aspects of the model. Pipeline exposure database, built environment occupancy type, pipeline vulnerability functions, and regional seismic hazard characteristics are used to calculate a probabilistic seismic risk for the pilot area. The results provide the variation of retrofit costs for pipelines in the pilot area based on their geographical location and the selected strengthening measures.
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Lifelines 2022
Pages: 329 - 343
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Published online: Nov 16, 2022
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