PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 984–991

© 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 Abstract This research investigates the structural-typological characteristics of reinforced concrete (RC) school buildings constructed between 1950 and 1980 in Italy aimed at supporting large-scale seismic vulnerability assessment. Drawing from detailed surveys of 30 schools and archival research, the work identifies four representative expert-judgment based structural archetypes, capturing recurrent features mainly based on typical in-plan characteristics of the buildings and accounting for other parameters such as number of storeys, plan geometry, frame system regularity, and infill layout. The analysis reveals common vulnerabilities, including soft-storey mechanisms, torsional irregularities, short columns, and inadequate reinforcement detailing, all of which critically affect seismic performance. Despite some favourable traits, such as rigid diaphragms and low-rise mass, the structural response is often dominated by irregularities and brittle failure modes. The classification aligns with national seismic risk mitigation frameworks (e.g., School-MARS) and provides the basis for the development of typology-based fragility models. These results may support targeted retrofit prioritization and contribute to a more refined archetype-driven approach to school vulnerability assessment, promoting scalable strategies for seismic resilience. XX ANIDIS Conference Toward the definition of 20th-century reinforced concrete school buildings archetypes for large-scale seismic vulnerability assessment Marco Postiglione a,b, *, Tommaso Petrella a , Giuseppe Brandonisio a , Bruno Calderoni a , Antonio Sandoli b,c , Giovanni Fabbrocino b,c a Department of Structures for Engineering and Architecture, University of Naples Federico II, Piazzale Tecchio 80, Naples 80125, Italy b Department of Biosciences and Territory, University of Molise, Via Francesco De Sanctis snc, Campobasso 86100, Italy c Institute for Construction Technologies ITC-CNR, National Research Council - Secondary branch of L’Aquila, Via Giosuè Carducci 32, L’Aquila 67100, Italy

* Corresponding author. Tel.: +39-081-768-2437 . E-mail address: marco.postiglione2@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.2025.12.126