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 ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 44 (2023) 1885–1892

© 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. Discrete Element Method is here used to evaluate the effectiveness of the strengthening solutions in avoiding the triggering of the out of-plane collapse of masonry walls, first on a simple masonry cell, and then on a heritage listed masonry building. A detailed cyclic model of the floor behavior was implemented: the unreinforced and reinforced floors were described by beams connected with non linear springs, reproducing the experimental hysteretic response. Both the case studies highlight the effectiveness of the strengthening solutions in reducing the out-of-plane displacements of masonry walls, confirmed also by a comparison with the ideal rigid diaphragm case. The reinforced floor is able to transfer the seismic forces to the shear-resistant walls. The out-of-plane displacements are compatible with the wall capacity, and the reinforced floor hysteretic cycles contribute to dissipate part of the input energy. Moreover, a proper connection design can also cap the transferred seismic forces to an acceptable level for shear-resistant walls. © 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: Retrofitting intervention; Timber floor; Seismic loading; Discrete Element Method; Non-linear dynamic analysis Abstract Masonry buildings are highly vulnerable to seismic loading, and their dynamic response is strongly influenced by the timber floor in pl ne deformability and by the q ality of the wall-to-floor con ec ions. U derstanding the behavior of timber floors and roofs and their interaction with the masonry walls is ther fore important for the protection of h storical buildings. In a previous research project, different timber-based dry-connected floo strengthening solutions wer tested under in-p ane oads. The exp rimental r sults show a s gnificant increase in shear streng h and stiffness. Discrete Element Method is here used to evaluate the effectiveness of the strengthening solutions in avoiding the triggering of the out of-plan collapse of masonry wall , first on a simpl masonry cell, and then on a heritage listed m sonry building. A detailed cyclic model of the floor beh vio was implemented: the unreinforced and reinforced floors were described by beams connect d with non linear springs, rep oducing the experimental hysteretic resp nse. Both the cas studie highlight the ffectiv ne s f th streng e i g solutions reducing the ou -of-plane displ cements of mas ry walls, confirmed also by a comparison w th the ideal rigid diap ragm case. The reinforced flo r is ab e to transf r the seis ic forces to the shear-resistant walls. The out-of-plane displacements are ompatible with th wa l capacity, and he reinforced floor hysteretic cycle cont ibute to dissipate part of the input energy. Moreover, a pro er connection design can also cap tra sferr seismic forces to an ac eptable l vel for shear-resistant walls. © 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 re ponsibility of scientific committe of the XIX ANIDIS C nfere ce, Seismic Engineering in Italy K ywords: Retrofitting intervention; Timb r floor; Seismic loading; Discrete Element Method; Non-linear dynamic analysis XIX ANIDIS Conference, Seismic Engineering in Italy Efficacy Assessment of Timber Based In-Plane Strengthening of Wooden Floors on the Seismic Response of Masonry Structures by means of DEM Analyses Alessandra Gubana a, *, Massimo Melotto a a Department of Engineering and Architecture, University of Udine, via delle Scienze 206, Udine 33100, Italy Abstract Masonry buildings are highly vulnerable to seismic loading, and their dynamic response is strongly influenced by the timber floor in plane deformability and by the quality of the wall-to-floor connections. Understanding the behavior of timber floors and roofs and their interaction with the masonry walls is therefore important for the protection of historical buildings. In a previous research project, different timber-based dry-connected floor strengthening solutions were tested under in-plane loads. The experimental results show a significant increase in shear strength and stiffness. XIX ANIDIS Conference, Seismic Engineering in Italy Efficacy Assessment of Timber Based In-Plane Strengthening of Wooden Floors on the Seismic Response of Masonry Structures by means of DEM Analyses Alessandra Gubana a, *, Massimo Melotto a a Department of Engineering and Architecture, University of Udine, via delle Scienze 206, Udine 33100, Italy

* Corresponding author. Tel.: +39 0432 558077. E-mail address: alessandra.gubana@uniud.it * Corresponding author. Tel.: +39 0432 558077. E-mail address: alessandra.gubana@uniud.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.2023.01.241