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 ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 44 (2023) 2174–2181

© 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 Because of its well-documented effectiveness in enhancing the strength and ductility of unreinforced masonry (URM) construction, Fiber Reinforced Mortar (FRCM) is now widely used for the consolidation of heritages, such as churches, palaces, castles, and entirely historical centers. The main purpose of this work is to provide the authors' principal outcomes in the FRCM application to masonry after performing extensive experimental campaigns and numerical simulations over the previous few years. The recent findings have already been appreciated by the research community but have yet to be considered in existing standard codes/recommendations, leaving the contribution of fiber mesh (i) and features of both coating mortar and URM wall (ii) to the improvement of the shear strength of reinforced masonry panels unclear. In fact, unlike FRP, fibers embedded in the mortar coating of the FRCM do not affect the shear strength of the reinforced panel, "limiting" its effect in enhancing the load-bearing capacity of the wall and, therefore, the structure's ductility. This important recent experimental/numerical evidence should be incorporated into the code’s recommendation to avoid overestimating the FRCM performance during design phases. Furthermore, the Italian codes suggest simplified amplification factors for estimating the improvement of shear strength owing to the strengthening system that ignores the fact that the greater the thickness of the masonry wall, the lower the FRCM's efficiency, and vice versa. A practice oriented analytical formulation has been provided to validate such mechanisms by confirming a consistent data set of masonry panels strengthened by FRCM tested under diagonal compression. In this work, a numerical investigation is provided to highlight the importance of considering the effective thickness- and tensile strength-ratio between the FRCM mortar coating and the URM panel to accurately predict the enhancement in the mechanical behaviour of the FRCM-reinforced masonry. © 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: Unreinforced Masonry Structures, Seismic Vulnerability, Stone Masonry, Fiber Reinforcement, Cultural Heritage, Diagonal Compression Test, Shear Strength XIX ANIDIS Conference, Seismic Engineering in Italy Assessment of the FRCM in-plane behavior in masonry retrofit applications Michele Angiolilli a , Amedeo Gregori b a Laboratori Nazionali del Gran Sasso - INFN, Via G. Acitelli 22, L’Aquila 67100, Italy b Dipartimento di Ingegneria Civile, Edile e Architettura, Via G. Gronchi 18, Università dell’Aquila, L’Aquila 67100, Italy Abstract Because of its well-documented effectiveness in enhancing the strength and ductility of unreinforced masonry (URM) construction, Fiber Reinforced M rtar (FRCM) is now widely used for t consolidation of heritages, such as churches, palaces, ca tles, and entirely hist ical centers. The main purpose of this work is to pr vide the authors' principal outcomes in the FRCM application to masonry af e performing extensive experimental campaigns and numeric l simulations over he previous few years. The recent findi gs have already be n appr ciated by he rese rch comm nity but have yet to be considered in existing standard co es/recommendations, leaving the contri ution of fibe mesh (i) a d feat res of both c ating mortar and URM wall (ii) to the improv ment of the shear strength of rei forced masonry pan ls unclear. In fact, unlike FRP, f bers embedded in the mortar coating of the FRCM do not affect the shear stre gth of the reinforced pa el, "limiting" its eff ct in enhancing the load-bearing c pacity of the wall and, therefore, the structure' ductility. T is imp tant rec nt exper mental/numerical evide ce shoul be incorporated into code’s recommendation to avoid overestimating the FRCM p rformance during design phases. Furt ermor , the Itali n codes suggest simplified amplifica ion fact rs for estimating the improvement of shear strength owing to the st engthening system that ignores the fact that the greater the hickness of the masonry wall, the lower the FRCM's eff ciency, and vice versa. A practice oriented analytical formulation has been provided to validate such mechanisms by confirming a consistent data set of masonry panels stre gthened by FRCM tested under diagonal compression. In this work, a numerical i vestigation is provided t highlight the impo tance of considering the ffective thickness- and t nsile strength-ratio betwe n the FRCM m rtar coating and t e URM panel to accurately predict the enhancement in the mechanical b haviour of the FRCM-reinforced mas nry. © 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 scientific committe of the XIX ANIDIS C nference, Seismic Engineering in Italy Keywords: Unreinforced Masonry Structures, Seismic Vulnerability, Stone Masonry, Fiber Reinforcement, Cultural Heritage, Diagonal Compression Test, Shear Strength XIX ANIDIS Conference, Seismic Engineering in Italy Assessment of the FRCM in-plane behavior in masonry retrofit applications Michele Angiolilli a , Amedeo Gregori b a Laboratori Nazionali del Gran Sasso - INFN, Via G. Acitelli 22, L’Aquila 67100, Italy b Dipartimento di Ingegneria Civile, Edile e Architettura, Via G. Gronchi 18, Università dell’Aquila, L’Aquila 67100, 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 © 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.2023.01.278