PSI - Issue 84

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ScienceDirect

Procedia Structural Integrity 84 (2026) 717–724

© 2026 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 the scientific committee of the Conference Keywords: Seismic vulnerability; Reinforced concrete; Pushover analysis; Steel jacketing; School buildings; Retrofitting. Abstract Protecting existing school buildings is a strategic priority in Italy, especially in high-seismicity regions like Rieti (Zone 2B). This paper analyzes the seismic vulnerability and the subsequent retrofitting proposal for the Minervini-Sisti school complex, a reinforced concrete frame structure built in 1974. The assessment was conducted through non-linear static analyses (pushover) using the N2 Method to compare structural capacity with site-specific seismic demand. The as-built study revealed critical deficiencies typical of 1970s construction: lack of strength hierarchy, absence of stirrups in beam-column joints, and brittle short column effects caused by infill walls. While the ductile safety index (IS-V) reached 0.87, the structure showed severe shear vulnerability and premature failures in vertical elements. The proposed retrofitting strategy employs steel jacketing for beams and columns, combined with specific reinforcements for unconfined joints. Post-intervention modeling shows that the solution is highly effective: increased confinement and ductility raised the brittle safety index to 81% and significantly lowered the seismic risk (PAM). These results demonstrate that targeted local reinforcements can successfully bring older school buildings up to modern safety standards. III Fabre Conference: Existing Bridges, Viaducts, and Tunnels: Research, Innovation, and Applications Vulnerability analysis and seismic retrofit proposals for a RC school building: the case study of the "Minervini-Sisti" complex in Rieti Manuel Capogna a , Salvatore Perno b , Egidio Lofrano b , Franco Ciminelli b,c , Galileo Tamasi c * a RINA S.p.A. - Via Corsica, 12 - 16128 Genova, Italy b Department of Structural and Geotechnical Engineering, University “La Sapienza”, Via Eudossiana 18, 00184 Rome, Italy c National Agency for Safety of Railway and Road Infrastructures, Viale del Policlinico, 2 – 00185 – Rome, Italy

* Corresponding author. Tel.: +39-320-619-7910 E-mail address: galileo.tamasi@ansfisa.gov.it

2452-3216 © 2026 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 the scientific committee of the Conference 10.1016/j.prostr.2026.06.092