PSI - Issue 44

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 44 (2023) 790–797

XIX ANIDIS Conference, Seismic Engineering in Italy An innovative ductile bracing system easily repairable after a seismic event XIX ANIDIS Conference, Seismic Engineering in Italy An innovative ductile bracing system easily repairable after a seismic event

Federico Gusella a* , Alessandro Mei a , Maurizio Orlando a a Department of Civil and Environmental Engineering of Florence, Via di S. Marta, 3 – 50139, Firenze, Italy Federico Gusella a* , Alessandro Mei a , Maurizio Orlando a a Department of Civil and Environmental Engineering of Florence, Via di S. Marta, 3 – 50139, Firenze, Italy

© 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 According to the capacity design method, earthquake-resistant structures should have the ability to dissipate energy through dissipative regions, which are expected to yield while the other structural members remain in the elastic field during seismic excitation. The nonlinear response of an innovative bracing system, in which the dissipation of energy relies on a fuse, is investigated through experimental tests. The fuse is subject to a combination of bending moment, axial, and shear force. Results provide useful information on the influence of several design parameters, such as the fuse cross-section compactness and shape, on the mechanical behavior of the system. The stability of the moment-rotation hysteresis loops and the energy dissipation are investigated through cyclic tests. The work highlights the fuse to be easily replaceable while ensuring ductile system response. © 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: Capacity design; experimental tests; Rotation ductility; Non-linear behavior; Energy dissipation; Steel bracing system. 1. Introduction Earthquake-resistant structures, designed according to the capacity design approach, require the ability to dissipate energy through dissipative regions, which are expected to yield under seismic actions (Eurocode 8), while brittle failures are avoided. For a structure designed according to the capacity design rule, through a linear-elastic analysis, a coefficient (seismic behavior factor) is used to reduce seismic forces. Several systems, capable of dissipating energy through plastic deformations, have been experimentally investigated: semi-rigid beam-to-column connections of moment resisting frame in Gusella et al. (2019), Yin et al. (2018a and 2018b), Leng et al. (2017), Mei et al. (2021) and Movaghati et al. (2019); diagonals of concentric X bracing systems formed by hot-rolled members in Celok et al. (2004), Tremblay (2002), Black et al. (1980) and Nip et al. (2010); cold-formed steel elements in Goggins et al. (2005), Moen et al. (2008), Pu et al. (1999), Lageron et al. (2014), Gusella et al. (2019) and shear 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 Abstract According to the capacity design method, earthquake-resistant structures should have the ability to dissipate energy through dissipative regions, which are expected to yield while the other structural members remain in the elastic field during seismic excitation. The onlinear response of an innovative bracing system, in which the dissipation of nergy r ies on a fuse, is investigated t rough experimental tests. The fuse is su je t to a combination of bending mome t, axial, and shear f rce. Result provide useful information on the influence of veral d sign para eters, such as the fuse cross-sect on compactness and shape, on the mechanical behavior of the syst m. The stability of the mo ent-rotation hystere is l ops and the energy dissipation are investigated through cycl c tests. The work highlights the fuse to be easily replaceable while ensuring uctil system res onse. © 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 u der responsibility of h scientific committee of the XIX ANIDIS C nference, Seismic Engineering in Italy Keywords: Capacity design; experimental tests; Rotation ductility; Non-linear behavior; Energy dissipation; Steel bracing system. 1. Introduction Earthquake-resistant structures, designed according to the capacity design approach, require the ability to dissipate energy through dissipative r g o s, whi h are expect d to yield under seismic tions (Eurocode 8), while brittle failur s are avoide . For a structure designed according to the capacity d ign rule, through a linear-elastic analysis, a coefficient (seismic behavio factor) is used to reduce seismic forces. Sev ral systems, capab e of dissipating energy through plastic deformations, have be n experimentally investigated: semi-rigid beam-to-co umn connec ons of moment resisting frame in Gusella et al. (2019), Yin t l. (2018a and 2018b), Leng et al. (2017), Mei et al. (2021) and Movaghati et al. (2019); diagonals of concentric X bracing systems formed by hot-ro led members in Celok et al. (2004), Trembl y 02 , Bl ck et al. (1980) and Nip et al. (2010); cold-formed stee ele nts in Goggins 5 Moen et al. (2008), Pu et al. (19 9), Lageron et al. (2014), Gusella et al. (2019) and shear 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.2023.01.103