PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 457–464

© 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: Masonry buildings; Seismic vulnerability; Fragility curves; Mechanical-analytical models; Regional scale; Strengthening systems; Composite Reinforced Mortar Abstract The inherent seismic vulnerability of existing masonry buildings is well-known. Within these assets, school masonry structures may exhibit even higher levels of vulnerability than ordinary buildings, due to function-related architectural peculiarities such as greater inter-storey heights, larger spacing between walls, more elongated or irregular floor plans, main façades with more and wider openings, internal walls with very limited openings. As part of the National DPC-ReLUIS project 2022-2024 (WP4 - MARS 2), the authors have already analyzed the seismic fragility of a stock of 101 school buildings located in the Friuli - Venezia Giulia region, in their current, unreinforced masonry (URM) configuration (Giusto et al., 2025). The analysis was based on a simplified mechanical-analytical procedure, to determine the seismic fragility curves, and accounted for key structural features, such as the geometry, the masonry characteristics, the gravity loads and the restraints. The paper presents preliminary results of ongoing research (DPC-ReLUIS 2024-2026) aimed at assessing the impact of retrofitting interventions. In particular, it focuses on the evaluation of the effects of the Composite Reinforced Mortar (CRM) strengthening strategy on the seismic fragility curves of the same building stock. The main features of the CRM reinforcement system, the methodology developed to adapt the analysis procedure to these interventions, and the comparison between the fragility curves in the as-is and retrofitted conditions are discussed. These results could be very useful in decision-making during the implementation of large-scale mitigation policies, as they can help predict the impact of the analyzed intervention at a territorial scale, as well as in comparison with other types of interventions, for which similar evaluations could be developed. XX ANIDIS Conference Seismic fragility curves of existing masonry school buildings: preliminary estimate of the large-scale effect of composite reinforced mortar application Ingrid Boem a, *, Natalino Gattesco a a University of Trieste, Department of Engineering and Architecture, Via Alfonso Valerio 6/1, 34127 Trieste, Italy

* Corresponding author. Tel.: /; fax: /. E-mail address: ingrid.boem@dia.units.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.2025.12.059