PSI - Issue 78

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ScienceDirect

Procedia Structural Integrity 78 (2026) 2162–2168

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers Keywords: Seismic vulnerability, complex masonry buildings, nonlinear static analysis, masonry structures Abstract This paper presents a seismic vulnerability assessment of a monumental masonry building located in Southern Italy, with particular emphasis on the modelling challenges posed by such a complex structure. The case study concerns a building constructed between 1750 and 1756 during the reign of Charles of Bourbon. The complex has a rectangular footprint (157 m × 125 m) featuring an internal courtyard (108 m × 77 m), and comprises three above -ground storeys. Each of the four corners of the structure includes tower- like volumes, or bastions (25 m × 25 m), which house rooms as well as stairwells that connect the upper levels, supplementing the stairs located in the front and rear wings. For the purpose of the vulnerability assessment, the building was subdivided into eight sections. Six structural models were analysed individually, each assumed to be isolated from adjacent portions. To reflect the good structural continuity of the complex, a global “as-is” model was also developed and analysed. Nonlinear analyses were conducted, including pushover analyses performed using the equivalent frame modelling approach, applied to both local (isolated) and global (as-is) models. The comparison of the results enables critical observations and supports the identification of more effective modelling strategies for the seismic analysis of complex masonry buildings. 1. Introduction Methods for assessing the seismic vulnerability of existing masonry buildings are generally well-suited for relatively simple structures—those isolated from adjacent buildings and exhibiting regular box-type behaviour. However, the Italian architectural heritage (Giuffrè 1993) includes not only such simple buildings but also more XX ANIDIS Conference Nonlinear modelling for the seismic vulnerability of complex monumental masonry buildings: a case study Giuseppe Brandonisio a , Laura Giovanna Guidi a *, Antonello De Luca a a Department of Structures for Engineering and Architecture, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples, Italy

* Corresponding author. E-mail address: lauragiovanna.guidi@unina.it

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers 10.1016/j.prostr.2025.12.275