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Experimental and Analytical Investigation of the Effects of Anchor Types and Strip Shapes on Shear-Deficient Reinforced Concrete Beams Strengthened with TRM Versus FRP

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Abstract

This article compares the shear performance of reinforced concrete (RC) beams strengthened with textile-reinforced mortar (TRM) and fiber-reinforced polymers (FRPs). The investigated parameters included strengthening material, i.e., TRM or FRP; two different (light and heavy) carbon meshes in the TRM strengthening method; anchor type (fan type and mechanical) and wrapping type (U-shape and side bonding). Thirteen fabricated reinforced concrete beams were strengthened and exposed to a three-point bending test. Two beams, one with insufficient shear strength (without stirrups) and the other with sufficient shear strength (with stirrups), were produced as control specimens. Eight beams were strengthened with TRM, and the remaining three beams were strengthened with FRP. The main findings from the study are as follows: (a) FRP was more successful than TRM by 5–45% in increasing the shear capacity of reinforced concrete beams depending on the parameters studied, (b) TRM with heavy carbon increased the shear capacity of beam specimens approximately 1.10 times compared to TRM with light carbon, (c) among the wrapping styles, side bonding was from 8 to 31% more effective, (d) the mechanical anchor increased the shear capacity against the fan-type anchor with a ratio ranging from 1.05 to 1.18 in U-shaped wrapping; however, the same ratio was between 0.91 and 0.94 for side bonding, and (e) the energy dissipation capacities in TRM and FRP strengthening were increased up to 3.62 and 4.13 times, respectively. Finally, the experimental study was verified with an analytical model, and reasonable results were obtained.

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  1. Civil Engineering Department, Ankara University, Ankara, Turkey

    Ömer Mercimek

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Mercimek, Ö. Experimental and Analytical Investigation of the Effects of Anchor Types and Strip Shapes on Shear-Deficient Reinforced Concrete Beams Strengthened with TRM Versus FRP. Int J Civ Eng 21, 1927–1950 (2023). https://doi.org/10.1007/s40999-023-00866-w

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