Strengthening with composite materials is becoming more and more an effective solution for increasing the structural safety of masonry buildings, often subjected to severe degradation or potentially vulnerable to seismic events. Structural retrofitting can be performed according to different techniques, based on Fiber Reinforced Polymer (FRP) or Fiber Reinforced Cementitious Matrix (FRCM) strengthening systems. The second group of composite systems is usually preferred nowadays thanks to some important advantages such as better compatibility with the substrate, applicability on wet surfaces, fire resistance, permeability and reversibility. Several experimental and numerical studies can be found in literature concerning masonry panels strengthened with FRP and FRCM systems. The knowledge about the use of the latter, nevertheless, is still partially limited, in particular if the out-of-plane behaviour of walls is taken into account, with the experimental and numerical database available resulting mainly restricted to monotonic cases. In this framework, results of an experimental campaign devoted to the study of the out-of-plane behaviour of tuff and brick masonry walls strengthened with different types of FRCM systems will be presented and discussed in this paper, performing also a comparison with available predictive formulas. Experimental results showed, in general, good performance of FRCM composite materials, with a proper exploitation of their tensile capacity, proving their effectiveness for the out-of-plane strengthening of historical masonry walls.

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[1] Carloni, C., and Subramaniam, K.V. FRP-masonry debonding: numerical and experimental study of the role of mortar joints. J. Compos. Constr. (2012) 16:581-589.

[2] Mazzotti, C., Ferracuti, B., and Bellini, A. Experimental bond tests on masonry panels strengthened by FRP. Composites Part B (2015) 80:223-237.

[3] De Felice, G., De Santis, S., Garmendia, L., Ghiassi, B., Larrinaga P., Lourenço, P.B., Oliveira D.V., Paolacci F. and Papanicolau C.G. Mortar-based systems for externally bonded strengthening of masonry. Materials and Structures (2014) 47:2021-2037.

[4] Carozzi, F.G., Bellini, A., D’Antino, T., de Felice, G., Focacci, F., Hojdys, L., Laghi, L., Lanoye, E., Micelli, F., Panizza, M. and Poggi, C. Experimental investigation of tensile and bond properties of Carbon-FRCM composites for strengthening masonry elements. Composites Part B (2017) 128:100-119.

[5] Papanicolaou, C., Triantafillou, T. and Lekka, M. Externally bonded grid as strengthening and seismic retrofitting materials of masonry panels. Construction and Building Materials (2011) 25(2):504-514.

[6] Bellini, A., Bovo, M. and Mazzotti, C. Experimental and numerical evaluation of fiber- matrix interface behaviour of different FRCM systems. Composites Part B (2019) 161:411-426.

[7] Bellini, A., Shahreza, S.K. and Mazzotti, C. Cyclic bond behavior of FRCM composites applied on masonry substrate. Composites Part B (2019) 169:189-199.

[8] Incerti, A. Tilocca, A.R., Ferretti, F. and Mazzotti, C. Influence of masonry texture on the shear strength of FRCM reinforced panels. In: R. Aguilar et al. (Eds.): Structural Analysis of Historical Constructions, RILEM Bookseries 18 (2019), pp. 1623-1631.

[9] Incerti, A., Ferretti, F. and Mazzotti, C. FRCM strengthening systems efficiency on the shear behavior of pre-damaged masonry panels: an experimental study. J Build Rehabil (2019) 4: 14. DOI: 10.1007/s41024-019-0053-9.

[10] Ferretti, F., Incerti, A., Tilocca A.R. and Mazzotti, C. In-Plane Shear Behavior of Stone Masonry Panels Strengthened through Grout Injection and Fiber Reinforced Cementitious Matrices. International Journal of Architectural Heritage (2019). DOI: 10.1080/15583058.2019.167580.

[11] Sassoni, E., Andreotti, S., Bellini, A., Mazzanti, B., Bignozzi M.C., Mazzotti, C. and Franzoni E. Influence of mechanical properties, anisotropy, surface roughness and porosity of brick on FRP debonding force. Compos Part B (2017) 108:257-269.

[12] Lignola, G.P., Caggegi, C., Ceroni, F., De Santis, S., Krajewski, P., Lourenço, P.B., Morganti, M., Papanicolaou, C., Pellegrino, C., Prota, A., and Zuccarino, L. Performance assessment of Basalt FRCM for retrofit applications on masonry. Compos Part B (2017) 128:1-18.

[13] Babaeidarabad, S., De Caso, F., and Nanni, A. Out-of-plane behavior of URM walls strengthened with Fabric-Reinforced Cementitious Matrix Composite. J Compos Constr 18 (2014). DOI 10.1061/(ASCE)CC.1943-5614.0000457.

[14] Harajli, M., ElKhatib, H., and Tomas San-Jose, J. Static and cyclic out-of-plane response of masonry walls strengthened using textile-mortar system. J Mater Civil Eng (2010) 22: 1171-1180.

[15] Bellini, A., Incerti, A., Bovo, M. and Mazzotti, C. Effectiveness of FRCM reinforcement applied to masonry walls subject to axial force and out-of-plane loads evaluated by experimental and numerical studies. International Journal of Architectural Heritage (2018) 12(3):376-394.

[16] Bellini, A., Incerti, A. and Mazzotti, C. Out-of-plane strengthening of masonry walls with FRCM composite materials. Key Engineering Materials (2017) 747:158-165.

[17] De Santis, S., Bellini, A., de Felice, G., Mazzotti, C., and Meriggi, P. Design of the out- of-plane strengthening of masonry walls with textile reinforced mortar composites. 9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering - CICE 2018. 17-19 July, Paris, France. 2018.

[18] ACI 549.4R-13. Guide to design and construction of externally bonded Fabric-Reinforced Cementitious Matrix (FRCM) systems for repair and strengthening concrete and masonry structures. 2013.

[19] ASTM C1314-16. Standard Test Method for Compressive Strength of Masonry Prisms. 2016.

[20] ASTM C109/C109M-16a. Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens). 2016.

[21] AC 434. Acceptance criteria for masonry and concrete strengthening using Fabric Reinforced Cementitious Matrix (FRCM) and Steel Reinforced Grout (SRG) composite systems. 2016.

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Published on 30/11/21
Submitted on 30/11/21

Volume Repair and strengthening strategies and techniques, 2021
DOI: 10.23967/sahc.2021.182
Licence: CC BY-NC-SA license

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