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<p>Fiber-reinforced polymer (FRP) rebars offer high strength, low weight, and corrosion resistance, making them attractive for strengthening concrete (RC) structures. However, their susceptibility to debonding failure at the concrete interface necessitates anchorage systems. FRP rebars can be anchored into the existing concrete using a variety of methods, such as epoxy injection and mechanical anchors. Epoxy injection is the most common type of FRP rebar anchorage system. This creates a composite element that is stronger and more ductile than the original concrete element. This research examined the effect of Glass Fiber Reinforced Polymer (GFRP) rebar anchorage on the strength improvement of reinforced concrete (RC) members during rehabilitation, aiming to determine the ideal number, depth, and spacing of these anchors. Ten RC beams and columns were tested, including one control element and nine strengthened with GFRP rebars, with initial M25 grade concrete and M40 grade concrete for strengthening. Key findings revealed that GFRP anchors significantly enhanced structural integrity and eliminated concrete cover detachment. Sample CN2D75S100 demonstrated superior crack resistance under stress due to optimal design and material properties. The optimized parameters for columns (two anchorage bars, 75&#xa0;mm depth, 100&#xa0;mm spacing) resulted in a 72.22% strength improvement. Similarly, sample BN2D30S100 exhibited the highest load capacity and deformation tolerance among beams, with optimized parameters (two bars, 30&#xa0;mm depth, 100&#xa0;mm spacing) leading to a 38.22% strength improvement. Taguchi’s regression analysis provided mathematical equations for predicting load-bearing capacity and deformation behavior, emphasizing reinforcement parameters’ critical role in strengthening RC element. Engineers can enhance load-bearing capacity and deformation behavior in RC elements by optimizing the number of rebars, embedment depth, and spacing.</p>

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Enhancing the Performance of Reinforced Concrete Members: A Study on GFRP Rebar Anchorage Systems

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Nivin Philip,
  • Shana Reji,
  • Sharon J. Puthiyidom,
  • Sharon Mariam Philip,
  • Subin Seban Jose

摘要

Fiber-reinforced polymer (FRP) rebars offer high strength, low weight, and corrosion resistance, making them attractive for strengthening concrete (RC) structures. However, their susceptibility to debonding failure at the concrete interface necessitates anchorage systems. FRP rebars can be anchored into the existing concrete using a variety of methods, such as epoxy injection and mechanical anchors. Epoxy injection is the most common type of FRP rebar anchorage system. This creates a composite element that is stronger and more ductile than the original concrete element. This research examined the effect of Glass Fiber Reinforced Polymer (GFRP) rebar anchorage on the strength improvement of reinforced concrete (RC) members during rehabilitation, aiming to determine the ideal number, depth, and spacing of these anchors. Ten RC beams and columns were tested, including one control element and nine strengthened with GFRP rebars, with initial M25 grade concrete and M40 grade concrete for strengthening. Key findings revealed that GFRP anchors significantly enhanced structural integrity and eliminated concrete cover detachment. Sample CN2D75S100 demonstrated superior crack resistance under stress due to optimal design and material properties. The optimized parameters for columns (two anchorage bars, 75 mm depth, 100 mm spacing) resulted in a 72.22% strength improvement. Similarly, sample BN2D30S100 exhibited the highest load capacity and deformation tolerance among beams, with optimized parameters (two bars, 30 mm depth, 100 mm spacing) leading to a 38.22% strength improvement. Taguchi’s regression analysis provided mathematical equations for predicting load-bearing capacity and deformation behavior, emphasizing reinforcement parameters’ critical role in strengthening RC element. Engineers can enhance load-bearing capacity and deformation behavior in RC elements by optimizing the number of rebars, embedment depth, and spacing.