PSI - Issue 44

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 44 (2023) 488–495

© 2023 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 XIX ANIDIS Conference, Seismic Engineering in Italy. Abstract This paper presents a benchmark study for the numerical simulation of unreinforced masonry walls under lateral loads using a new modelling strategy. The proposed MUDis (Multi-unit discretization) procedure foresees the discretization of masonry walls into a layout composed of modules, with pre-established geometry and sizes, identified to appropriately reproduce the typical in-plane collapse behaviour of masonry walls subjected to lateral loading. These modules are made of four elastic units separated by nonlinear interface elements that allow to reproduce the failure mechanisms along their surfaces. The mechanical parameters of the interface elements are described through appropriate parametric formulas that modify the “combined cracking-shearing-crushing” model proposed by Lourenco and widely used in the simplified micro-modelling of masonry structures for FE analysis purposes. The reliability of the proposed procedure, already calibrated and validated for two-dimensional panels, is assessed by reproducing the experimental behaviour of a more complex structure subjected to pushover analyses. The benchmark test considered herein is a masonry façade belonging to a three-dimensional building experimentally tested under lateral loads for which results are available in literature. © 2022 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 XIX ANIDIS Conference, Seismic Engineering in Italy Keywords: Masonry analysis; Seismic vulnerability; Nonlinear analysis; Masonry buildings; pushover analysis; FEM analysis. 1. Introduction Historical architectural heritage is mainly composed of masonry buildings, thereby resulting particularly vulnerable to earthquake actions. Thus, the seismic analysis of masonry constructions becomes pivotal to investigate their actual Keywords: Masonry analysis; Seismic vulnerability; Nonlinear analysis; Masonry buildings; pushover analysis; FEM analysis. Historical architectural heritage is mainly compo XIX ANIDIS Conference, Seismic Engineering in Italy Non-Linear Analysis of URM Structures through a Multi-Unit Discretization Approach Ylenia Di Lallo a , Davide Rapone a , Maria Giovanna Masciotta a , Giuseppe Brando a, * a University “G. d’Annunzio” of Chieti-Pescara, Department of Engineering and Geology, viale Pindaro 42, Pescara 65127, Italy Yl

* Corresponding author. Tel.: +39 0854537071; fax: +39 085.4537255. E-mail address: giuseppe.brando@unich.it

2452-3216 © 2022 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 XIX ANIDIS Conference, Seismic Engineering in Italy

2452-3216 © 2023 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 XIX ANIDIS Conference, Seismic Engineering in Italy. 10.1016/j.prostr.2023.01.064