PSI - Issue 78

Giuseppe Brandonisio et al. / Procedia Structural Integrity 78 (2026) 2162–2168

2168

SLV (a g S=0.288g). For the Completed Global Model (red bars of the histograms), the displacement capacity varies from d Rd, Pushover 1=54mm to d Rd, Pushover 7 =83m. The displacement demand goes from d Ed, Pushover 1 =85mm to d Ed, Pushover 7 =95mm. The lowest of the values of the seismic vulnerability index is ξ E,SLV Pushover 4 =0.64. The A+B+C+D+1+2+3+4 model falls into the seismic risk class B, managing to resist a maximum acceleration on the ground equal to a max S Pushover 1 =0.184g, therefore less than the acceleration of ground demand at SLV (a g S=0.288g). Conclusions This paper addresses the non-linear finite element modelling of complex masonry buildings for seismic vulnerability assessment using the equivalent frame approach. In the case of monumental masonry structures—which are often not isolated and are characterized by structural modifications, additions, alterations, and misaligned openings—global structural analyses alone may be insufficient. Unlike ordinary and regular masonry buildings, the non-linear seismic response of such complex structures is highly sensitive to these irregularities. In such cases, the analysis of local models—i.e., sub-assemblies exhibiting a seismic behavior substantially independent from the rest of the structure— enables the identification of local critical issues and supports a more informed engineering judgment regarding the seismic vulnerability of the entire building.The proposed analytical approach was applied to the seismic vulnerability assessment of a complex monumental building located in southern Italy dating ac to 1756 . The results presented in the paper show that: t he seismic vulnerability indexes (ζE) obtained from the global models of the buildings were generally lower than those derived from the local models; the local model representing the most significant portion of the building yielded vulnerability indexes that were very close to those of the global model Acknowledgements The support given by ReLuis consortium is acknowledged. WP10 topics are the focus of the activities “Aspetti normativi - Costruzioni in Muratura” incorporated into DPC-ReLuis 2024-2026. The Authors would like to express their gratitude to Eng. Giandomenico Di Marco as design leader for the vulnerability assessment, and Eng. Alfonso Grimaldi for his valuable contribution to structural modelling and analysis. References Brandonisio G., Angelillo M., Antonello De Luca A. (2020). Seismic capacity of buttressed masonry arches. Engineering Structures, (215). Brandonisio, G., De Luca, A., 2021. Analytical modelling for the seismic assessment of pointed arches supported by buttresses. International Journal of Masonry Research and Innovation, 6(4), 384-404 Brandonisio, G., Angelillo, M., De Luca, A., 2020. Seismic capacity of buttressed masonry arches. Engineering Structures, 215, 110661. Brandonisio, G, De Luca (2024). “Non-linear Modelling for seismic analyses of complex masonry buildings: in-between global and local modelling”. Proceedings of WCEE202 – 18 th World Conference on Earthquake Engineering – Milan (ITA), 30 th June – 5 th July 2024. CM 2019. Instructions for the application of the updated Technical standards for constructions. (Istruzioni per l’applicazione dell’Aggiornamento delle “Norme tecniche per le costruzioni” di cui al D.M. 17/01/2018). Circolare 21/01/2019, no. 7 C.S.LL.PP [in Italian]. Formisano, A, Mazzolani, FM, Florio, G, Landolfo, R, 2010. A quick methodology for seismic vulnerability assessment of historical masonry aggregates. COST C26 Final Conference "Urban Habitat Constructions under Catastrophic Events”, Naples, September 2010 Giuffrè, A., 1993. Sicurezza e conservazione dei centri storici. Il caso di Ortigia . Editori Laterza. NTC 2018. Updated Technical standards for constructions. (Norme Tecniche per le Costruzioni, D.M. 17/01/2018, Ministero delle Infrastrutture e dei Trasporti, S.O. no. 8 alla G.U. del 20/2/2018 no. 42, Rome, Italy) [in Italian]. Pagano M. (1968). “Teoria degli edifici. Vol. 1: Edifici in muratura”. Liguori Editore (ITA). Sorrentino, P. Brandonisio, G., De Luca, A. (2023-a). “A proposal for evaluation of seismic vulnerability of complex masonry building with additions: the case of Zoological Station Anton Dohrn”. Procedia Structural Integrity,Volume 44, 2023, Pages 1648-1655,ISSN 2452-3216, https://doi.org/10.1016/j.prostr.2023.01.211. (https://www.sciencedirect.com/science/article/pii/S2452321623002196). Sorrentino, P. Brandonisio, G., De Luca, A. (2023-b). “A proposal for evaluation of seismic vulnerability of complex masonry building with additions: the case of Zoological Station Anton Dohrn”, Procedia Structural Integrity, Volume 44, 2023, Pages 1648-1655, ISSN 2452-3216, https://doi.org/10.1016/j.prostr.2023.01.211. (https://www.sciencedirect.com/science/article/pii/S2452321623002196). Rondelet, J. (1814). “Traité Théorique Et Pratique De L'Art De Bâtir”.