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<p>Fiber-reinforced polymers (FRP) are increasingly being utilized for the repair and retrofitting of reinforced concrete (RC) structures. However, the behavior and durability of these materials under elevated temperatures remain a critical concern. This study investigates the performance of FRP-strengthened RC samples subjected to 250&#xa0;°C temperatures. A total of 90 square RC columns (200 × 200&#xa0;mm cross-section) of M20 and M30 grades with varying heights (400, 600, and 800&#xa0;mm) and aspect ratios (2, 3, and 4) were cast and preloaded to 70% of their ultimate capacity to induce damage. These damaged samples were then retrofitted using single and double layers of glass fiber-reinforced polymer (GFRP) and carbon fiber-reinforced polymer (CFRP) sheets, with a 20&#xa0;mm corner radius provided to enhance confinement. The retrofitted samples were exposed to elevated temperatures up to 250&#xa0;°C to evaluate their fire resistance and residual axial load-carrying capacity. M30 grade columns exhibited superior performance over M20 grade samples, while those with lower aspect ratios demonstrated higher strength. Also, CFRP wrapping demonstrated superior performance over GFRP. The experimental outcomes were validated with numerical simulations using ABAQUS software, showing close correlation and underscoring the effectiveness of FRP confinement in enhancing fire-damaged RC sample performance. The study concludes that numerical modeling can significantly reduce the need for extensive laboratory testing while reliably predicting the structural behavior of FRP-strengthened samples under fire exposure.</p>

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Investigation of temperature effects on the residual axial capacity of FRP-strengthened RC square samples with different aspect ratios

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Samyak D. Parekar,
  • Syed Wasim Nawaz Razvi,
  • Madhu K. A,
  • Nilesh Mate

摘要

Fiber-reinforced polymers (FRP) are increasingly being utilized for the repair and retrofitting of reinforced concrete (RC) structures. However, the behavior and durability of these materials under elevated temperatures remain a critical concern. This study investigates the performance of FRP-strengthened RC samples subjected to 250 °C temperatures. A total of 90 square RC columns (200 × 200 mm cross-section) of M20 and M30 grades with varying heights (400, 600, and 800 mm) and aspect ratios (2, 3, and 4) were cast and preloaded to 70% of their ultimate capacity to induce damage. These damaged samples were then retrofitted using single and double layers of glass fiber-reinforced polymer (GFRP) and carbon fiber-reinforced polymer (CFRP) sheets, with a 20 mm corner radius provided to enhance confinement. The retrofitted samples were exposed to elevated temperatures up to 250 °C to evaluate their fire resistance and residual axial load-carrying capacity. M30 grade columns exhibited superior performance over M20 grade samples, while those with lower aspect ratios demonstrated higher strength. Also, CFRP wrapping demonstrated superior performance over GFRP. The experimental outcomes were validated with numerical simulations using ABAQUS software, showing close correlation and underscoring the effectiveness of FRP confinement in enhancing fire-damaged RC sample performance. The study concludes that numerical modeling can significantly reduce the need for extensive laboratory testing while reliably predicting the structural behavior of FRP-strengthened samples under fire exposure.