PSI - Issue 44

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

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Procedia Structural Integrity 44 (2023) 1324–1331

© 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 The difficulties on the assessment of the seismic capacity of existing masonry buildings through non-linear FEM analyses have been examined in this paper, in the framework of the equivalent frame modeling. A significant problem lies in identifying an adequate equivalent frame idealization of the walls, i.e., capable of providing an acceptable response of the numerical model. Indeed, the geometrical complexity characterizing real masonry buildings, often due to irregular distribution of the wall openings, leads to choices and expedients which are impossible to codify and may only be defined on a case-by-case basis. Consequently, an adequate engineering judgment, which must obviously be considered when the results are being interpreted, is required. Linear and non-linear analysis were adopted on equivalent frame schemes of existing walls highlighting the problems of identifying geometric patterns, as well as defining the mechanical model of the spandrels or the influence of connection degree between orthogonal walls on the seismic behavior. In this paper some possible solutions to the problems are proposed, also with reference to specific study cases. © 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: Existing masonry buildings; Equivalent frame; Modelling; Spandrels, Flenge effect; Seismic analyses. 1. Introduction Seismic capacity assessment of existing unreinforced masonry (URM) buildings plays a crucial role to develop mitigation strategies for cultural heritage, especially after the catastrophic effects of earthquakes occurred worldwide The difficulties on the assessment of the seismic capacity of existing masonry buildings through non-linear FEM analyses have This is an open access article under the CC B XIX ANIDIS Conference, Seismic Engineering in Italy Open issues on non-linear modelling for seismic assessment of existing masonry buildings Gaetana Pacella a , *, Antonio Sandoli a , Bruno Calderoni a , Giuseppe Brandonisio a † a University of Naples “Federico II”, Department of Structures for Engineering and Architecture (Di.St.), P.le Tecchio, 80 - 80125 Naples (Italy) a , a a i a

* Corresponding author. Tel.: 329-7155294; fax: 0971-992077. E-mail address: gaetana.pacella@unina.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.2023.01.170