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<p>Effective strengthening methods are now required because of the weakening of RC structures caused due to aging, exposure to the environment, increased service loads, and design changes. The exceptional specific strength and inherent durability against environmental degradation of fibre-reinforced polymer FRP composites have found broad application in enhancement of structural integrity of reinforced concrete structures. Carbon Fiber Reinforced Polymer (CFRP), a synthetic FRP material, is more costly and less environmentally friendly. Natural fibre composites have drawn interest as environmentally friendly substitutes in recent years. The mechanical response of RC beams retrofitted with Kenaf Fiber Reinforced Polymer (KFRP) laminates and wrapping techniques is examined in this study. RC beams strengthened with various KFRP configurations were the subject of an experimental program that was compared to control specimens. The study included load-deflection analysis, strain measurements, failure mode observations, concrete compressive strength tests, tensile testing of KFRP composites, and material characterization tests. According to experimental findings, KFRP-strengthened beams show notable gains in stiffness, flexural capacity, and crack resistance. When compared to control beams, the ultimate load carrying capacity rose by roughly 25–44%. Furthermore, a FEA was performed using ANSYS software to simulate the beam behaviour. The numerical models accurately predicted the ultimate failure loads and matched the physical test results with a small error margin of 5 to 10%. The findings demonstrate that KFRP composites can be used to strengthen reinforced concrete structures in a sustainable and economical manner effectively replacing synthetic FRP composites.</p>

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Experimental investigation of the retrofitting of RC beams using Kenaf fiber reinforced polymer wrapping techniques

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • S. Venkat Raman,
  • R. Kishore,
  • M. Sedhupathi,
  • V. Subash Krishnan,
  • M. Vijay Pranav

摘要

Effective strengthening methods are now required because of the weakening of RC structures caused due to aging, exposure to the environment, increased service loads, and design changes. The exceptional specific strength and inherent durability against environmental degradation of fibre-reinforced polymer FRP composites have found broad application in enhancement of structural integrity of reinforced concrete structures. Carbon Fiber Reinforced Polymer (CFRP), a synthetic FRP material, is more costly and less environmentally friendly. Natural fibre composites have drawn interest as environmentally friendly substitutes in recent years. The mechanical response of RC beams retrofitted with Kenaf Fiber Reinforced Polymer (KFRP) laminates and wrapping techniques is examined in this study. RC beams strengthened with various KFRP configurations were the subject of an experimental program that was compared to control specimens. The study included load-deflection analysis, strain measurements, failure mode observations, concrete compressive strength tests, tensile testing of KFRP composites, and material characterization tests. According to experimental findings, KFRP-strengthened beams show notable gains in stiffness, flexural capacity, and crack resistance. When compared to control beams, the ultimate load carrying capacity rose by roughly 25–44%. Furthermore, a FEA was performed using ANSYS software to simulate the beam behaviour. The numerical models accurately predicted the ultimate failure loads and matched the physical test results with a small error margin of 5 to 10%. The findings demonstrate that KFRP composites can be used to strengthen reinforced concrete structures in a sustainable and economical manner effectively replacing synthetic FRP composites.