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<p>Carbon fibre-reinforced polymers (CFRP) are widely used to reinforce concrete due to their superior corrosion resistance, durability, and flexibility compared to conventional steel reinforcement. This study aims to investigate the structural performance of reinforced concrete (RC) beams strengthened with CFRP sheets, focusing on the influence of fibre orientation and width on shear and flexural behaviour. Six RC beams with dimensions of 1500&#xa0;mm × 200&#xa0;mm × 150&#xa0;mm were cast and externally strengthened using CFRP U-jackets at a 45° orientation, identified as the most effective configuration compared to 0° and 90°. The specimens were tested under two-point loading to evaluate load-carrying capacity, deflection behaviour, ductility index, energy absorption and failure modes. Furthermore, finite element analysis (FEA) was performed to numerically model and validate the experimental findings. The experimental and FEA results showed strong agreement, confirming the reliability and accuracy of the numerical model. Beams strengthened with wider CFRP U-jackets exhibited notably higher load-carrying capacity, reduced deflection, and delayed crack propagation. Overall, the study demonstrates that optimising the orientation and width of CFRP sheets can significantly improve the strength and ductility of RC beams, providing a reliable and durable solution for structural rehabilitation and retrofitting.</p>

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Influence of CFRP strip width and fibre orientation on the shear and flexural performance of RC beams

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Darshan Gaidhankar,
  • Harshal Ganesh Mahajan,
  • Sandeep Sathe,
  • Pravin Dnyandeo Gunaware,
  • Ganesh Ingle

摘要

Carbon fibre-reinforced polymers (CFRP) are widely used to reinforce concrete due to their superior corrosion resistance, durability, and flexibility compared to conventional steel reinforcement. This study aims to investigate the structural performance of reinforced concrete (RC) beams strengthened with CFRP sheets, focusing on the influence of fibre orientation and width on shear and flexural behaviour. Six RC beams with dimensions of 1500 mm × 200 mm × 150 mm were cast and externally strengthened using CFRP U-jackets at a 45° orientation, identified as the most effective configuration compared to 0° and 90°. The specimens were tested under two-point loading to evaluate load-carrying capacity, deflection behaviour, ductility index, energy absorption and failure modes. Furthermore, finite element analysis (FEA) was performed to numerically model and validate the experimental findings. The experimental and FEA results showed strong agreement, confirming the reliability and accuracy of the numerical model. Beams strengthened with wider CFRP U-jackets exhibited notably higher load-carrying capacity, reduced deflection, and delayed crack propagation. Overall, the study demonstrates that optimising the orientation and width of CFRP sheets can significantly improve the strength and ductility of RC beams, providing a reliable and durable solution for structural rehabilitation and retrofitting.