PSI - Issue 44

P. Sorrentino et al. / Procedia Structural Integrity 44 (2023) 1664–1671 P. Sorrentino et al. / Structural Integrity Procedia 00 (2022) 000 – 000

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This irregular layout of openings can reduce the lateral strength and stiffness of the wall. Furthermore, it can induce a nonuniform distribution of gravity loads among masonry piers and unfavourable damage localizations resulting in a premature collapse of the wall and hence a higher seismic vulnerability (Parisi and Augenti, 2013). Several studies have been published about the impact of sizes and position of openings on strength and stiffness of masonry walls. Parisi and Augenti (2013) provided a simplified methodology (macroelement method) to assess the effect of irregularities on the in-plane seismic capacity of unreinforced masonry (URM) walls with openings. Parisi et al. (2015) investigated the influence of vertically misaligned openings on the in-plane seismic capacity of URM walls by a sensitivity analysis based on nonlinear FE macro-modelling, static pushover analysis and regression analysis. Liu and Crewe (2020) analysed the impact of opening size and position on the in-plane capacity of URM walls with a DEM micro modelling approach. In this framework, the regular arrangement of openings must be verified, with particular attention to the walls that do not overlook main roads and the internal ones as they are often subject to alterations. 4. Conclusion The preliminary design approach for the assessment a complex building has been discussed in the paper throughout the case study of San Carlo all’Arena Convent. In particular, the issues of the historical modification, as additions in plan and in vertical direction, the aggregated buildings, the presence of different occupancy, geometrical complexities, foundations at different heights and the presence of alterations (the addition of misaligned openings in vertical direction) have been discussed and their structural implications are underlined. Acknowledgements Thanks to Arch. Marianna Pedalino (Città Metropolitana di Napoli, Dirigente della Direzione Tecnica Scuole) and Arch. Annarita Marciano (Città Metropolitana di Napoli, Direzione Tecnica Scuole, Responsabile del Procedimento per l’intervento in oggetto). References Maio, N., Crovato, P., Palumbo, G., 2016. Dall’antico istituto di incoraggiamento all’ istituto tecnico G.B. Della Porta. Atti di Convegno CSLLPP (Consiglio Superiore dei Lavori Pubblici). D.M. 17 gennaio 2018 in materia di “norme tecniche per le costruzioni”. Gaz zetta Ufficiale n.42 del 20 febbraio 2018, Supplemento ordinario n.8, Ministero delle Infrastrutture e dei trasporti, Roma; 2018, in Italian Formisano, A., Mazzolani, F. M., Florio. G., Landolfo, R., 2010. A quick methodology for seismic vulnerability assessment of historical masonry aggregates. Conference Paper Giuffrè, A., 1993. Sicurezza e conservazione dei centri storici. Il caso di Ortigia . Editori Laterza Chieffo, N., Formisano, A., Mochi, G., Mosoarca, M., 2021. Seismic Vulnerability Assessment and Simplified Empirical Formulation for Predicting the Vibration Periods of Structural Units in Aggregate Configuration. Geosciences 2021, 11, 287. https://doi.org/10.3390/geosciences11070287 Angiolilli, M., Lagomarsino, S., Cattari, S., Degli Abbati, S., 2021. Seismic fragility assessment of existing masonry buildings in aggregate. In: Engineering Structures 247 (2021) 113218. https://doi.org/10.1016/j.engstruct.2021.113218 Parisi, F., Augenti, N., 2013. Seismic capacity of irregular unreinforced masonry walls with openings. In: Earthquake Engineering and Structural Dynamic (2013) 42:101 – 12 Parisi, F., Sabella, G., Augenti, N., 2015. Seismic capacity prediction for irregular masonry walls with opening offsets. Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing Liu, Z., Crewe, A., 2020. Effects of size and position of openings on in-plane capacity of unreinforced masonry walls. Bulletin of Earthquake Engineering (2020) 18:4783-4812