PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 745–752

© 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: unreinforced masonry; soil-foundation-structure interaction; lumped parameter models; nonlinear analysis Abstract This paper evaluates and discusses the seismic response of unreinforced masonry buildings accounting for soil-foundation-structure interaction. A new strategy to model soil-foundation-structure interaction is firstly developed adopting a lumped parameters approach. A case study masonry building is selected, together with the foundation layout and soil profile. Lumped parameters models for the foundation of each masonry panel are then calibrated from 3D frequency domain analysis and applied at the base of the considered building, modelled by means of an equivalent-frame strategy. The lateral capacity of the entire building is assessed by pushover analyses, also allowing the estimation of relevant thresholds of a properly selected engineering demand parameter. Multi-stripe nonlinear dynamic analyses, carried out for different earthquake’s return periods, are finally performed to define the demand. Results obtained allow to assess the building’s performance and its modification due to the consideration of soil foundation-structure interaction. XX ANIDIS Conference Seismic response of URM buildings accounting for soil-foundation structure interaction adopting lumped parameter models Stefano Bracchi a *, Maria Iovino b , Rosa Maria Stefania Maiorano b , Maria Rota a , Raffaele Di Laora c , Luca De Sanctis b , Andrea Penna a,d a EUCENTRE Foundation, Via Ferrata 1, 27100 Pavia, Italy b Dept. of Engineering, University of Napoli Parthenope, Centro Direzionale Isola C4, 80143 Napoli, Italy c Dept. of Engineering, University of Campania “Luigi Vanvitelli”, via Roma 29, 81031Aversa (CE), Italy d Dept. of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy

* Corresponding author. Tel.: +39 0382-5169843. E-mail address: stefano.bracchi@eucentre.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.2025.12.095