PSI - Issue 44

Giacomo Lazzerini et al. / Procedia Structural Integrity 44 (2023) 163–170 Giacomo Lazzerini et al. / Structural Integrity Procedia 00 (2022) 000–000

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5. Conclusion

In this paper, the topic of fragility curves for a specific building typology was addressed. The investigated typology included masonry buildings in the Casentino area dating from the 1960s and 1970s, governed by global seismic behaviour. About 400 building numerical models were generated on 3Muri software, which uses the F.M.E. (Frame by Macro Element) approach, a total of 3200 nonlinear static analyses were performed. The analyzed building stock was partly derived from known geometries of real buildings and partly from a morphological study of the built environment and it can be considered representative of the investigated building typology. The variability in the geometric and structural parameters of the models was carefully assessed based on the actual state of the built environment in the studied area. The fragility curves were constructed following an analytical approach and the cumulative lognormal function was used, starting from the probabilistic processing of the capacity PGAs obtained from the pushover curves. For the investigated building typology, in which collapse mostly occurs on the base floor due to its high opening percentage, it was found that the parameters that most affect the seismic response and therefore the fragility curves are: the material type on the base floor, the opening percentage on the base floor and the height of the building. Based on numerical analysis results, a fragility curves database for the investigated building typology was created. The database consists of 8 groups of fragility curves, each referring to the features of the building to be assessed. In each group 4 fragility curves related to the 4 damage levels considered (DL4 = SLC, DL3 = SLV, DL2 = SLD, DL1 = SLO) are reported. The database is an easy operational tool that provides the fragility of all buildings of interest, based only on a few relevant parameters. Moreover, these parameters are easily detectable by sight, and without extensive investigations, so this aspect makes the applicability of the provided database even more practical and quicker on large-scale assessments, where the buildings to be examined may be a considerable number. 3Muri software 2020. S.T.A. DATA Srl 3Muri - version 12.6.2.1. Calvi, G.M., Pinho, R., Magenes, G., Bommer, J.J., Restrepo-Vélez, L.F. & Crowley, H. 2006. Development of seismic vulnerability assessment methodologies over the past 30 years. ISET journal of Earthquake Technology (43)3: 75–104. Chieffo, N., Clementi, F., Formisano, A. & Lenci, S. 2019. Comparative fragility methods for seismic assessment of masonry buildings located in Muccia (Italy). Journal of Building Engineering (25): 100813. Circolare 2019. Circolare 21 Gennaio 2019, n.7 Istruzioni per l’applicazione dell’ «Aggiornamento delle “Norme tecniche per le costruzioni"» . Coniglio Superiore dei Lavori Pubblici, Rome, Italy Kassem, M.M., Mohamed Nazri, F. & Noroozinejad Farsangi, E. 2020. The seismic vulnerability assessment methodologies: A state-of-the-art review. Ain Shams Engineering Journal . Lazzerini, G. 2021. Costruzione di curve di fragilità per tipologie edilizie toscane esistenti in muratura mediante analisi globali. University of Florence. Master deegre Thesis. Maio, R. & Tsionis, G. 2015. Seismic fragility curves for the European building stock. Brussels: JRC Technical Report, European Commission . Milosevic, J., Cattari, S. & Bento, R. 2020. Definition of fragility curves through nonlinear static analyses: procedure and application to a mixed masonry-RC building stock. Bulletin of Earthquake Engineering (18)2: 513–545. Del Monte, E. 2017. Vulnerabilità del costruito in Casentino. In: Conferenza nell’ambito di “Rischio sismico e gestione dell’emergenza. Cultura della prevenzione . Bibbiena (AR). NTC 2018. Norme Tecniche per le Costruzioni Decreto Ministeriale del 17-01-2018 . Coniglio Superiore dei Lavori Pubblici, Italy References