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<p>This study presents a critical review and synthesis of the mechanical and bond degradation behavior of CFRP-strengthened reinforced concrete (RC) members under elevated temperature and fire exposure. A systematic screening of experimental and analytical studies is conducted, followed by a unified classification of temperature-dependent degradation mechanisms affecting CFRP materials, FRP concrete bond interfaces, concrete, and steel reinforcement. Results indicate that CFRP tensile strength and stiffness remain largely stable below the resin glass transition temperature (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(T_{g}\)</EquationSource> </InlineEquation> ≈ 50 to 120 °C), followed by rapid degradation within the <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(T_{g}\)</EquationSource> </InlineEquation> to <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(T_{d}\)</EquationSource> </InlineEquation> range and severe loss of load-transfer capacity beyond the resin decomposition temperature (<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(T_{d}\)</EquationSource> </InlineEquation> ≈ 120 to 350 °C). At 120 to 150 °C, externally bonded reinforcement (EBR) systems exhibit bond strength reductions of approximately 65 to 80%, whereas near-surface mounted (NSM) systems show comparatively lower losses of about 55 to 70%. A comparison of analytical models shows that sigmoid-type formulations effectively capture global degradation trends, while calibrated and piecewise models offer higher accuracy for fire scenarios at the expense of increased complexity. The study proposes a unified, mechanism-based framework to guide model selection and post-fire residual capacity assessment of CFRP-strengthened RC members.</p> Graphical abstract <p></p>

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Fire performance of FRP-strengthened reinforced concrete columns: a comprehensive review

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Shamil K. Ahmed,
  • T. A. Majid,
  • M. Z. A. Mohd Zahid,
  • Zaid Al-Azzawi

摘要

This study presents a critical review and synthesis of the mechanical and bond degradation behavior of CFRP-strengthened reinforced concrete (RC) members under elevated temperature and fire exposure. A systematic screening of experimental and analytical studies is conducted, followed by a unified classification of temperature-dependent degradation mechanisms affecting CFRP materials, FRP concrete bond interfaces, concrete, and steel reinforcement. Results indicate that CFRP tensile strength and stiffness remain largely stable below the resin glass transition temperature ( \(T_{g}\) ≈ 50 to 120 °C), followed by rapid degradation within the \(T_{g}\) to \(T_{d}\) range and severe loss of load-transfer capacity beyond the resin decomposition temperature ( \(T_{d}\) ≈ 120 to 350 °C). At 120 to 150 °C, externally bonded reinforcement (EBR) systems exhibit bond strength reductions of approximately 65 to 80%, whereas near-surface mounted (NSM) systems show comparatively lower losses of about 55 to 70%. A comparison of analytical models shows that sigmoid-type formulations effectively capture global degradation trends, while calibrated and piecewise models offer higher accuracy for fire scenarios at the expense of increased complexity. The study proposes a unified, mechanism-based framework to guide model selection and post-fire residual capacity assessment of CFRP-strengthened RC members.

Graphical abstract