PSI - Issue 44

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Procedia Structural Integrity 44 (2023) 1060–1067

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© 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. An experimental and numerical research, aimed at evaluating the in-plane seismic performance of an innovative steel modular system for the reinforcement of load-bearing masonry walls (named “Resisto 5.9”, designed by Progetto Sisma s.r.l.), is currently underway at the EUCENTRE Foundation in Pavia. Two different masonry typologies, representing common solutions in Italian existing buildings, were considered in this campaign: one made up with solid clay bricks and lime mortar, with “header bond” pattern, and the other with a typical Italian hollow clay “doppio UNI” unit and cement-lime mortar, assembled in a “Flemish bond” pattern. The experimental tests included first the complete mechanical characterization of units, mortars, masonry typologies and of the strengthening system components (i.e. steel elements and anchors). In-plane quasi-static tests were performed on different batches of full-scale specimens to investigate the influence of the proposed reinforcement system on the lateral in-plane response of the walls, compared to their unreinforced conditions. The cyclic behaviour of the masonry piers was analysed in terms of elastic stiffness, lateral strength, displacement capacity and energy dissipation, depending on the achieved damage mechanism. The numerical study of the ongoing campaign consisted of a series of parametric analyses on advanced discontinuous models based on the Distinct Element Method (DEM), considering different wall dimensions, vertical load levels and boundary conditions, in addition to those tested experimentally. Moreover, the numerical campaign was extended also to other possible masonry typologies, varying the bond pattern and the mechanical properties with respect to the experimentally tested solutions. In this paper, the results of the experimental tests on solid brick masonry together with a preliminary overview of the findings of the numerical study, still ongoing, were reported. An experimental and numerical research, aimed at evaluating the in-plane seismic performance of an innovative steel modular system for the reinforcement of load-bearing masonry walls (named “Resisto 5.9”, designed by Progetto Sisma s.r.l.), is currently underway at the EUCENTRE Foundation in Pavia. Two different masonry typologies, representing common solutions in Italian existing buildings, were conside d in t is camp ign: one made up with solid clay bricks and lime mortar, with “h ader bond” pat rn, and the other with a typical It l an holl w clay “doppio UNI” unit and c me t-lime m rtar, asse bled in a “Flemish bond” pattern. The experimental tests included first the complete mechanical characterization of units, mortars, masonry typolo ies and of the stre gthening system compone ts (i.e. steel elements nd anchors). In-plane quas -static tests were erformed on differ nt batches of full-sc le specimens to investigate the i fluence of the proposed reinforcem nt system on the lateral in-pla e response of the walls, compared to their unreinforc d conditions. The cy lic behaviour of the ason y pier was analysed in terms of la tic stiff ess, lateral strength, displac ment capacity and energy dis ipation, d pending on the achieved damage mechanism. The numerical study of the ongoing campaign consisted of a series f param tric analyses on adva ced disconti uous models based on the Distinct Element Method (DEM), c sidering different wall d mensions, vertical load level d boundary condition , in addition to tho e tested experimentally. Moreover, th numerical campaign was extended also to other possible masonry typologies, varying the b d pattern and the mechanical properties with respe t to the experimentally te ted sol tions. In this paper, the results of th experimental tests on s lid b ick masonry together with a prelim n ry overvi w of the fi ings f the numeric l study, still ngoing, w re reported. Keywords: Unreinforced masonry walls; Experimental tests; In-plane cyclic resp nse; Masonry eismic str ngthening; Non-linear analyses. XIX ANIDIS Conference, Seismic Engineering in Italy In-plane seismic performance of an innovative steel modular reinforcement system for URM walls P. Morandi a, *, L. Albanesi a , N. Damiani b , C.F. Manzini a , G. Magenes c a Department of Construction and Infrastructure - EUCENTRE Foundation, Pavia, Italy b UME Graduate School, IUSS Pavia, Pavia, Italy c Department of Civil Engineering and Architecture, University of Pavia, Italy XIX ANIDIS Conference, Seismic Engineering in Italy In-plane seismic perf rma ce of an i novative s eel modular reinforcement system for URM walls P. Morandi a, *, L. Albanesi a , N. Damiani b , C.F. Manzini a , G. Magenes c a Department of Construction and Infrastructure - EUCENTRE Foundation, Pavia, Italy b UME Graduate School, IUSS Pavia, Pavia, Italy c Department of Civil Engineering and Architecture, University of Pavia, Italy Abstract Abstract

Keywords: Unreinforced masonry walls; Experimental tests; In-plane cyclic response; Masonry seismic strengthening; Non-linear analyses.

* Corresponding author. Tel.: +39-03825169847. E-mail address: paolo.morandi@eucentre.it

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.2023.01.137 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 © 2022 The Authors. Published by ELSEVIER B.V. This is n open access article u er 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 * Corresponding author. Tel.: +39-03825169847. E-mail address: paolo.morandi@eucentre.it