Gentile, Roberto; Galasso, Carmine; (2022) Exploiting the peak deformation-hysteretic energy relationship in aftershock fragility analysis. In: Proceedings of the The 13th International Conference on Structural Safety and Reliability (ICOSSAR 2021). (pp. pp. 1-10). ICOSSAR

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Abstract

A recently-proposed framework to derive state-dependent fragility relationship of structures subjected to ground-motion sequences (e.g. mainshock-aftershock or triggered earthquakes) is illustrated. The hysteretic energy dissipated in the sequence is adopted as the main engineering demand parameter (EDP) since it is a cumulative measure that monotonically increases with the excitation length. According to the framework, the hysteretic energy-peak deformation trend is estimated and used to convert deformation-based EDP damage-state thresholds into energy-based ones. A vector-valued probabilistic seismic demand model is derived in the form of a surface relating the hysteretic energy in the sequence to the peak deformation in the mainshock and a ground-motion intensity measure of the aftershock. This is calibrated via sequential cloud-based time-history analyses. Finally, state-dependent fragility curves are derived. The framework is demonstrated for 14 reinforced concrete frame buildings with different heights, plastic mechanisms and infill distribution. The results show the feasibility of the proposed approach, effectively capturing damage accumulation without inconsistencies in the obtained statistical model.

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