PSI - Issue 44

Romina Sisti et al. / Procedia Structural Integrity 44 (2023) 1380–1387 Romina Sisti et al. / Structural Integrity Procedia 00 (2022) 000–000

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mechanism may allow predicting possible scenarios in terms of both seismic vulnerability and safety measures and addressing targeted interventions on specific macro-elements aimed to reduce the vulnerability of the whole church. All the fragility curves were herein proposed in terms of slight (D1), moderate (D2-D3) and severe (D4-D5) damage. The fragility curves for the damage to single macro-elements show that the seismic response of the ‘façade’ and ‘principal nave’ closely approximates the global response of the church, since their vulnerability is similar to that associated to the global damage index. On the contrary, larger differences were observed for the damage associated with the other two recurrent macro-elements, i.e. the apse and the bell tower. These results evidence that, if during the emergency phase following an earthquake, a quick damage assessment of the church is required, the survey could be limited to the only “façade” and “principal nave” macro-elements without significantly changing the large-scale damage assessment. The analysis of the fragility curves for single mechanisms evidenced further interesting information. In particular, the mechanisms M16, M17 and M18 of the apse and the mechanism M8 of the vaults of the principal nave are more vulnerable than the corresponding macro-elements already at ‘moderate damage’ and the standing out elements in the bell towers, M26, are highly vulnerable for ‘severe damage’. Thus, this means that a special attention should be paid to these mechanisms during the surveys. Acknowledgements This work has been carried out under the financial support of the Italian Department of Civil Protection, within the ReLUIS-DPC 2022–24 Research Project. References Baker, J., 2015. 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