Retrofitting with FRCM Composites: Shear and Flexural Behaviour of Strengthened Masonry Walls

Abstract:

Structural strengthening using composite materials is nowadays one of the most interesting techniques to overcome weaknesses of masonry structures constituting large part of the building heritage. The use of FRCM composites is becoming more and more widespread due to some limitations of FRP retrofitting systems. In this framework, the presented experimental study is aimed at evaluating the in-plane and the out-of-plane behaviour of masonry walls strengthened with different types of FRCMs, analyzing in detail failure modes, capacity increments and efficiency of the strengthening systems when tested using two different configurations. To this purpose, bidirectional basalt grids and unidirectional steel fiber sheets, coupled with a lime based mortar, were used for retrofitting clay brick masonry walls subjected to diagonal compression tests and out-of-plane flexural tests. Experimental outcomes, when considering the in-plane or the out-of-plane direction, show that the adopted different layout strictly influences the flexural and shear strengthening efficiency of the reinforcement.

• Periodical: Key Engineering Materials (Volume 919)
• Pages: 80-89
• DOI: https://doi.org/10.4028/p-6q01h0
• Online since: May 2022
• Authors: Andrea Incerti*, Alessandro Bellini, Anna Rosa Tilocca, Marco Savoia
• Keywords: Digital Image Correlation, FRCM, In-Plane, Masonry, Out-of-Plane

References

[1] Linea Guida per la identificazione, la qualificazione ed il controllo di accettazione di compositi fibrorinforzati a matrice inorganica (FRCM) da utilizzarsi per il consolidamento strutturale di costruzioni esistenti, Consiglio Superiore dei Lavori Pubblici, Servizio Tecnico Centrale, Rome, Italy, (2018).

DOI: 10.3221/igf-esis.12.04

[2] A. Bellini, A.R. Tilocca, I. Frana, M. Savoia, C. Mazzotti, Environmental durability of FRCM strengthening systems and comparison with dry fabrics, Proceedings of 17th IB2MaC 2020, Kracow, Poland, 5-8 July (2020).

DOI: 10.1201/9781003098508-50

[3] C. Faella, E. Martinelli, E. Nigro, S. Paciello. Shear capacity of masonry walls externally strengthened by a cement-based composite material: An experimental campaign. Constr Build Mater 24 (2010) 84-93.

DOI: 10.1016/j.conbuildmat.2009.08.019

[4] L. Feo, R. Luciano, G. Misseri, L. Rovero, Irregular stone masonries: Analysis and strengthening with glass fibre reinforced composites, Compos Part B 92 (2016) 84-93.

DOI: 10.1016/j.compositesb.2016.02.038

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

DOI: 10.1007/s41024-019-0053-9

[6] F. Ferretti, A. Incerti, A.R. Tilocca, C. Mazzotti, In-Plane Shear Behavior of Stone Masonry Panels Strengthened through Grout Injection and Fiber Reinforced Cementitious Matrices, Int J Archit Heritage,.

DOI: 10.1080/15583058.2019.1675803

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

DOI: 10.1061/(asce)mt.1943-5533.0000128

[8] S. Babaeidarabad, F. De Caso, A. Nanni, 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.

DOI: 10.1061/(asce)cc.1943-5614.0000457

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

DOI: 10.1080/15583058.2017.1323246

[10] A. Bellini, A. Incerti, C. Mazzotti, Out-of-plane strengthening of masonry walls with FRCM composite materials, Key Eng Mat 747 (2017) 158-165.

DOI: 10.4028/www.scientific.net/kem.747.158

[11] UNI EN 1015-11, Methods of test for mortar for masonry – Part 11: Determination of flexural and compressive strength of hardened mortar, (2007).

DOI: 10.3403/01905442u

[12] ASTM E519-15, Standard test method for diagonal tension (shear) in masonry assemblages, American Society for Testing Material, (2015).

[13] RILEM TC - LUM B6, Diagonal tensile strength tests of small wall specimens, (1991).

[14] C. Mazzotti, B. Ferracuti, A. Bellini, Experimental study on masonry panels strengthened by GFRP: the role of inclination between mortar joints and GFRP sheets, Key Eng Mat 624 (2015) 559-566.

DOI: 10.4028/www.scientific.net/kem.624.559

[15] C. Calderini, S. Cattari, S. Lagomarsino. The use of the diagonal compression test to identify the shear mechanical parameters of masonry. Constr Build Mater 24 (2010) 677-685.

DOI: 10.1016/j.conbuildmat.2009.11.001

[16] M.M. Frocht, Recent advances in photoelasticity, ASME Trans. 55 (1931) 135-153.