PSI - Issue 44

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

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Procedia Structural Integrity 44 (2023) 1877–1884

© 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. © 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: Equivalent-frame model; Equivalent truss element; Nonlinear dynamic analysis; Nonlinear macroelement; Seismic performance; Timber retrofit; Unreinforced masonry (URM) piers, with oriented-strand boards nailed to the frames. Thi technique aims at i proving both th in-plane a d out-of-plane capacitie of masonry iers as w ll a wall-to-diaphragm connections. Quasi-static cyclic she r-compression tests were first conducted on two isol ted piers to assess the in-plane response improvement. Dyn mic sh ke-table tests w re then perf rmed o two full-scale building specimens r presenting th end-unit of a cavity-wall terraced house, in bar and ret fitted conditions, where also the timber diaph agms were stiffened. Numerical model were built and calibrat d against th xperimental data adopting an equival nt-fra e approach, where masonry members were discr tiz d int multipl onlinear macroelements while timber components were represented by equivalent elasto-plastic truss elements. Results in terms of hysteretic lateral force-displacement responses from nonlinear dynamic analyses are discussed to validate the proposed modeling strategy. © 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: Equivalent-frame model; Equivalent truss element; Nonlinear dynamic analysis; Nonlinear macroelement; Seismic performance; Timber retrofit; Unreinforced masonry (URM) XIX ANIDIS Conference, Seismic Engineering in Italy Numerical simulation of a timber retrofit solution for unreinforced masonry buildings Gabriele Guerrini a,b, *, Nicolò Damiani c , Marco Miglietta c , Francesco Graziotti a,b a Department of Civil Engineering and Architecture (DICAr), University of Pavia, Via Ferrata 3, 27100 Pavia, Italy b European Centre for Training and Research in Earthquake Engineering (EUCENTRE Foundation), Via Ferrata 1, 27100 Pavia, Italy c University School for Advanced Studies IUSS Pavia, Piazza della Vittoria 15, 27100 Pavia, Italy Abstract This paper presents the results of a numerical study about the performance of a new timber retrofit solution for unreinforced masonry buildings in seismic regions. The proposed retrofit consists of timber frames fastened to the internal surface of masonry piers, with oriented-strand boards nailed to the frames. This technique aims at improving both the in-plane and out-of-plane capacities of masonry piers as well as wall-to-diaphragm connections. Quasi-static cyclic shear-compression tests were first conducted on two isolated piers to assess the in-plane response improvement. Dynamic shake-table tests were then performed on two full-scale building specimens representing the end-unit of a cavity-wall terraced house, in bare and retrofitted conditions, where also the timber diaphragms were stiffened. Numerical models were built and calibrated against the experimental data adopting an equivalent-frame approach, where masonry members were discretized into multiple nonlinear macroelements while timber components were represented by equivalent elasto-plastic truss elements. Results in terms of hysteretic lateral force-displacement responses from nonlinear dynamic analyses are discussed to validate the proposed modeling strategy. XIX ANIDIS Conference, Seismic Engineering in Italy Numerical simulation of a timber retrofit olution for unreinforced masonry buildings Gabriele Guerrini a,b, *, Nicolò Damiani c , Marco Miglietta c , Francesco Graziotti a,b a Department of C vil Engineering and Architecture (DICAr), Un versity of Pavia, Via Ferrata 3, 27100 Pavia, Italy b European Centre for Training and Research in Earthquake Engineering (EUCENTRE Foundation), Via Ferrata 1, 27100 Pavia, Italy c University School for Advanced Studies IUSS Pavia, Piazza della Vittoria 15, 27100 Pavia, Italy Abstract This paper p esents the results of a numerical study about the performance of a new timber retrofit solution for unreinforced masonry buildings in seismic regions. The proposed retrofit sists f timber frames fastened to the inte nal surface of masonry

* Corresponding author. Tel.: +39 0382 98 5452 E-mail address: gabriele.guerrini@unipv.it * Corresponding author. Tel.: +39 0382 98 5452 E-mail address: gabriele.guerrini@unipv.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 © 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.2023.01.240