Cimmino, Antonio; Gentile, Roberto; Ceroni, Francesca; Caterino, Nicola; (2024) Preliminary Application of Simplified Fragility Modelling on Budget Allocations for Building Portfolio Seismic Retrofit. In: Proceedings, World Conference on Earthquake Engineering (18WCEE). International Association Earthquake Engineering: Milan, Italy.

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Abstract

Seismic risk reduction plays a key role in the achievement of a more resilient society, especially for densely populated cities in moderate-to-high seismicity areas characterised by a high vulnerability of the built environment. Since limited resources are usually allocated for risk reduction measures (e.g., building retrofit), defining a risk prioritization scheme to rationally distribute the budget is fundamental. Risk assessment of large building portfolios including several building classes often requires simplified fragility estimation methods. This paper aims to implement a budget allocation framework for building portfolios by adopting a simplified fragility estimation method. This is exemplified by considering an ideal-but-realistic portfolio of buildings representing Italian reinforced concrete schools. The fragility of each relevant building class in the portfolio is evaluated using Simple Lateral Mechanism Analysis (SLaMA). For each class, potential retrofit solutions with increasing levels of building performance are considered. The optimal combination of retrofit interventions is defined as the one that minimizes the portfolio seismic risk constrained to a limited budget. The solution is obtained using an optimization algorithm, effectively balancing accuracy while mitigating computational demands

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