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) 2166–2173

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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.2023.01.277 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 T e Authors. Published by ELSEVIER B.V. This is n open access ticle 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 © 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 Fabric Reinforced Cementitious Matrix (FRCM) can be used to improve the shear strength of masonry walls. The contribution of the FRCM is evaluated, accordingly to existing standard, taking into account the FRCM-to-substrate bond strength and the tensile strength of bare fabrics, neglecting the mortar matrix. Nevertheless, to date, there are no experimental tests that provide the actual shear capacity of the FRCM alone and not bonded to the substrate. To this scope, a four-hinge articulated steel frame was designed to investigate the shear behaviour of small-scale square specimens, as well as the mechanism of shear stress transfer between the fabric and the mortar. This paper presents the outcomes of shear tests performed on four FRCM composites, comprising of two basalt fabrics embedded in either lime- or cement-based mortars, in order to assess the influence of the single components. Digital image correlation (DIC) was also used to determine the displacement fields, strains and to detect the crack pattern of the specimens. 1. Introduction The increment of the shear strength of a masonry wall provided by a fabric reinforced cementitious matrix (FRCM) system is evaluated, from an experimental point of view, as the difference between the shear strength of the strengthened wall and that of the unreinforced one as suggested, amongst all, by Papanicolaou et al. (2007), Del Zoppo et al. (2019) and Meriggi et al. (2022). This philosophy is, indeed, also shared by existing guidelines – ACI 549.6R 20 (2020), CNR DT-215 (2018), EAD 340275-00-0104 (2020), de Felice et al. (2018) – whereas the contribution of the mortar matrix (making up the composite) is not directly accounted for. Despite their simplicity, the aforementioned XIX ANIDIS Conference, Seismic Engineering in Italy Experimental investigation of FRCM under shear loading Rebecca Fugger 1 , Sara Fares 1 *, Pietro Meriggi 1 , Francesca Nerilli 2 , Sonia Marfia 1 , Elio Sacco 3 , Gianmarco de Felice 1 1 Roma Tre University, Department of Engineering. Via Vito Volterra 62, 00146 Rome, Italy. 2 Niccolò Cusano University. Via Don Carlo Gnocchi 3, 00166, Rome, Italy. 3 University of Naples “Federico II”, Department of Structures for Engineering and Architecture. Naples, Italy. Abstract Fabric Reinforced Cementitious Matrix (FRCM) can be used to improve the shear strength of masonry walls. The contribution of the FRCM is evaluated, accordingly to existing standard, taking into account the FRCM-to-substrate bond strength and the tensile strength of bare fabrics, neglecting the mortar matrix. Nevertheless, to date, there are no experimental tests that provide the actual shear capacity of the FRCM alone and not bonded to the substrate. To this scope, a four-hinge articulated steel frame was designed to investigate the shear behaviour of small-scale square specimens, as well as the mechanism of shear stress transfer between the fabric and the mortar. This paper presents the outcomes of shear tests performed on four FRCM composites, comprising of two basalt fabrics embedded in either lime- or cement-based mortars, in order to assess the influence of the single components. Digital image correlation (DIC) was also used to determine the displacement fields, strains and to detect the crack pattern of the specimens. Keywords: Experimental shear test; shear behaviour; Fabric Reinforced Cementitious Matrix; Digital Image Correlation; articulated steel frame. 1. Int oduction The increment of the shear strength of a masonry wall provided by a fabric reinforced cementitious matrix (FRCM) system is evaluated, from an experimental point of view, as the difference between the shear strength of the strengthened wall and that of the unreinforced one as suggested, amongst all, by Papanicolaou et al. (2007), Del Zoppo et al. (2019) and Meriggi et al. (2022). This philosophy is, indeed, also shared by existing guidelines – ACI 549.6R 20 (2020), CNR DT-215 (2018), EAD 340275-00-0104 (2020), de Felice et al. (2018) – w reas the contribution of the mortar matrix (making up the composite) is not directly accounted for. Despite their simplicity, the aforementioned XIX ANIDIS Conference, Seismic Engineering in Italy Experimental investigation of FRCM under shear loading Rebecca Fugger 1 , Sara Fares 1 *, Pietro Meriggi 1 , Francesca Nerilli 2 , Sonia Marfia 1 , Elio Sacco 3 , Gianmarco de Felice 1 1 Roma Tre University, Department of Engineering. Via Vito Volterra 62, 00146 Rome, Italy. 2 Niccolò Cusano University. Via Don Carlo Gnocchi 3, 00166, Rome, Italy. 3 University of Naples “Federico II”, Department of Structures for Engineering and Architecture. Naples, Italy. Keywords: Experimental shear test; shear behaviour; Fabric Reinforced Cementitious Matrix; Digital Image Correlation; articulated steel frame. * Corresponding author. Tel.: +39 06 5733 3637. E-mail address: sara.fares@uniroma3.it * Corresponding author. Tel.: +39 06 5733 3637. E-mail address: sara.fares@uniroma3.it