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<p>This study investigates the performance of CFRP-rehabilitated reinforced concrete (RC) beams subjected to thermomechanical loading under elevated temperatures. Experimental and numerical analyses were carried out to evaluate load–deflection response, stiffness, nodal temperature distribution, and failure modes before and after rehabilitation. The novelty of this research lies in examining the synergistic effect of CFRP laminates in reducing temperature propagation within the beam by nearly 20% and enhancing post-fire load resistance. Unlike previous studies that focus only on ambient or elevated mechanical loading, this work provides combined thermomechanical insights supported by both finite element modeling and experimental validation. The scientific contribution of this study is the establishment of a comparative framework between experimental and numerical models, highlighting the critical temperature (400&#xa0;°C) for failure initiation and demonstrating the efficiency of CFRP in delaying debonding and extending fire resistance. Observations indicated that the failure load and deflection were recorded at 15.15&#xa0;kN and 9.15&#xa0;mm before rehabilitation, and at 18.30&#xa0;kN and 7.95&#xa0;mm after rehabilitation. The numerical value was evaluated against experimental findings, as an identical dimensional prototype was produced and allowed to cure. Before rehabilitation, the first crack manifested at a load of 6.25&#xa0;kN, exhibiting a deflection of 2.53&#xa0;mm, which is 20% lower than the results obtained from numerical analysis. Following rehabilitation, the first crack displayed at a load of 7.85&#xa0;kN, representing an increase of 20% compared to the deflected beam and 30% relative to the numerical analysis. The failure load exhibits a similar trend. The calculated stiffness ratio yields values ranging from 1.3 to 1.7. The initial temperature within the region was measured at 390&#xa0;°C using a thermocouple before wrapping, followed by a reduction to 315&#xa0;°C post-wrapping. The CFRP wrapping restricted the temperature increase in the beam. The primary mode of failure observed in the experimental study was the debonding of laminates at a temperature of 500&#xa0;°C. A test with a rebound hammer was carried out in order to evaluate the strength.</p>

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Enhancing elevated temperature of concrete beams through carbon fiber laminate rehabilitation

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • R. Surya Prakash,
  • N. Parthasarathi

摘要

This study investigates the performance of CFRP-rehabilitated reinforced concrete (RC) beams subjected to thermomechanical loading under elevated temperatures. Experimental and numerical analyses were carried out to evaluate load–deflection response, stiffness, nodal temperature distribution, and failure modes before and after rehabilitation. The novelty of this research lies in examining the synergistic effect of CFRP laminates in reducing temperature propagation within the beam by nearly 20% and enhancing post-fire load resistance. Unlike previous studies that focus only on ambient or elevated mechanical loading, this work provides combined thermomechanical insights supported by both finite element modeling and experimental validation. The scientific contribution of this study is the establishment of a comparative framework between experimental and numerical models, highlighting the critical temperature (400 °C) for failure initiation and demonstrating the efficiency of CFRP in delaying debonding and extending fire resistance. Observations indicated that the failure load and deflection were recorded at 15.15 kN and 9.15 mm before rehabilitation, and at 18.30 kN and 7.95 mm after rehabilitation. The numerical value was evaluated against experimental findings, as an identical dimensional prototype was produced and allowed to cure. Before rehabilitation, the first crack manifested at a load of 6.25 kN, exhibiting a deflection of 2.53 mm, which is 20% lower than the results obtained from numerical analysis. Following rehabilitation, the first crack displayed at a load of 7.85 kN, representing an increase of 20% compared to the deflected beam and 30% relative to the numerical analysis. The failure load exhibits a similar trend. The calculated stiffness ratio yields values ranging from 1.3 to 1.7. The initial temperature within the region was measured at 390 °C using a thermocouple before wrapping, followed by a reduction to 315 °C post-wrapping. The CFRP wrapping restricted the temperature increase in the beam. The primary mode of failure observed in the experimental study was the debonding of laminates at a temperature of 500 °C. A test with a rebound hammer was carried out in order to evaluate the strength.