Gentile, Roberto; Bianchi, Simona; Ciurlanti, Johnatan; (2024) Towards a direct loss-based building design approach integrating seismic and energy losses. In: Proceedings of the 18th World Conference on Earthquake Engineering (WCEE 2024). International Association for Earthquake Engineering (IAEE)

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Abstract

This paper presents a tentative procedure to design retrofit solutions for reinforced concrete buildings to contemporarily achieve: 1) an acceptable target level of earthquake-induced loss (e.g., deaths, dollars, downtime) under a specified site hazard profile; 2) an acceptable target level of energy-related loss (i.e., energy use intensity and cost). The procedure first adopts Direct Loss-Based Design (DLBD) to identify a set of design candidates complying with the earthquake loss target. The candidates are represented by the capacity curve of equivalent single degree of freedom systems. By using surrogate probabilistic seismic demand models and a simplified loss assessment module, DLBD does not require design iterations. Among the design candidates, a set of intelligently selected seismic retrofit alternatives are defined. Those are used as a starting point to define energy retrofit alternatives analysed via dynamic energy simulations. After combining the above in a set of integrated seismic and energy retrofit alternatives, a lifecycle approach is used to quantify the economic losses due to both seismic damage and energy power consumption (i.e., operational energy). This choice enables to obtain, at a reasonable computational cost, a more-refined seismic and energy annual loss estimate by explicitly including primary structure, building envelope, services, and contents. The lifecycle analysis results are adopted to select the design candidate complying with the above-mentioned main objectives, and structural and envelope detailing is finally identified. The proposed approach is demonstrated for the integrated seismic and energy retrofitting of an existing reinforced concrete building. The results highlight the advantages of considering both seismic and energy performance considerations in the building design process, providing insights into the potential trade-offs and synergies between seismic safety and energy efficiency, ultimately supporting the creation of more resilient and sustainable buildings.

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