PSI - Issue 78

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ScienceDirect

Procedia Structural Integrity 78 (2026) 2154–2161

© 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 R.C. building, infill panels, nonlinear static analysis, school building Abstract This paper presents a seismic vulnerability assessment of a complex reinforced concrete (RC) school building constructed in the mid-1970s. The structure was originally designed to support vertical loads only, predating the extension of seismic hazard class ification to nearly the entire Italian territory. The case study is located within a school campus in Pomigliano d’Arco (Napl es, Southern Italy). The building features a quadrangular plan layout and extends over four above-ground levels, reaching a maximum height of approximately 14 meters. It is organized around a large central covered atrium, approximately 30 × 22 meters in size, spanned by a steel roof structure composed of trusses and a corrugated metal deck or other metallic material. The atrium serves as the connection point between the various volumes that compose the building complex. The load-bearing system consists of ordinary RC frames (beams and columns), mainly oriented transversely to the longitudinal axis of each block. The floors are made of clay – concrete composite slabs on all levels, including the roof, except over the atrium, where a steel structure is used. Despite its large plan dimensions, the building lacks seismic joints, resulting in unified structural behaviour. However, for the purposes of seismic modelling and analysis, a functional subdivision into four idealized blocks was introduced, with separations corresponding to the RC walkways that link the various volumes. This modelling strategy enables a more effective structural interpretation and clearer identification of potential local vulnerabilities. 1. Introduction Strong earthquakes impacting urban areas can cause catastrophic damage, particularly when buildings have been designed without adequate seismic provisions. This issue becomes even more critical in the case of national heritage and strategically important buildings such as schools. In Italy, the school building stock comprises over 47,000 XX ANIDIS Conference Seismic assessment of a 1970s reinforced concrete school complex originally designed for gravity loads Laura Giovanna Guidi a, *, Giuseppe Brandonisio 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.2025.12.274