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<p>Fabric–Reinforced Cementitious Matrix (FRCM) strengthening system has recently been developed for repair and strengthening of reinforced concrete (RC) structures. However, there is a paucity of research on the residual performance of FRCM–strengthened structures following the exposure to fire actions. This study aims to numerically investigate the flexural response of RC beams strengthened with FRCM systems after exposure to elevated temperatures. Finite element modeling (FEM) framework was developed using ABAQUS software package. The developed models were validated using experimental data available in the literature for strengthened beams tested at temperatures up to T = 300&#xa0;°C. The numerical results included the nodal temperatures, the failure modes, the residual capacity, the FRCM and concrete strains, and the ductility indices. The model efficiently captured the entire nonlinear performance of the strengthened beams regardless of the thermal damage occurred. The experimental–to–numerical ratio of the yielding loads ranged between 0.90 and 0.96, whereas the residual capacity ratio ranged between 0.93 and 1.13. A parametric study was then conducted to determine the flexural response of the beams tested under the impact of potential temperatures up to T = 800&#xa0;°C. The findings confirmed that the FRCM is an effective strengthening solution that can retain up to 72% of the residual capacity recorded at the ambient temperature. A multivariate regression analysis was also conducted to develop, for the first of its kind, a reliable temperature–dependent model capable of predicting the strain thresholds at the debonding of FRCM systems subjected to elevated temperatures.</p>

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Finite element modeling of reinforced concrete beams strengthened with FRCM systems at elevated temperatures

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Ahmed Mandor,
  • Basma Taie,
  • Omar Aljidda

摘要

Fabric–Reinforced Cementitious Matrix (FRCM) strengthening system has recently been developed for repair and strengthening of reinforced concrete (RC) structures. However, there is a paucity of research on the residual performance of FRCM–strengthened structures following the exposure to fire actions. This study aims to numerically investigate the flexural response of RC beams strengthened with FRCM systems after exposure to elevated temperatures. Finite element modeling (FEM) framework was developed using ABAQUS software package. The developed models were validated using experimental data available in the literature for strengthened beams tested at temperatures up to T = 300 °C. The numerical results included the nodal temperatures, the failure modes, the residual capacity, the FRCM and concrete strains, and the ductility indices. The model efficiently captured the entire nonlinear performance of the strengthened beams regardless of the thermal damage occurred. The experimental–to–numerical ratio of the yielding loads ranged between 0.90 and 0.96, whereas the residual capacity ratio ranged between 0.93 and 1.13. A parametric study was then conducted to determine the flexural response of the beams tested under the impact of potential temperatures up to T = 800 °C. The findings confirmed that the FRCM is an effective strengthening solution that can retain up to 72% of the residual capacity recorded at the ambient temperature. A multivariate regression analysis was also conducted to develop, for the first of its kind, a reliable temperature–dependent model capable of predicting the strain thresholds at the debonding of FRCM systems subjected to elevated temperatures.