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<p>Nowadays, researchers have focused on strengthening reinforced concrete (RC) beams with prestressed fiber-reinforced polymer (FRP) composite over the conventional non-prestressed systems. This study presents a detailed nonlinear finite element modeling (FEM) of reinforced concrete (RC) beams strengthened with prestressed near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) bars. The numerical models were developed using ABAQUS software, incorporating concrete damage plasticity to capture cracking, crushing, and stiffness degradation, while CFRP-bar rupture was modeled using Extended Finite Element Modeling (XFEM). The models were then validated using experimental test results published in a well-known journal. Then, the validated FEM were used in a comprehensive parametric study investigating the behavior of control, strengthened with non-prestressed and prestressed CFRP rods, demonstrating good agreement in load–deflection behavior, failure modes, and ultimate capacities. Parametric analyses were conducted to assess the effects of concrete compressive strength, steel reinforcement ratio, number of FRP rods, level of prestressing, and type of FRP rod. The findings confirm that concrete compressive strength, steel reinforcement ratio, and the number of FRP rods significantly enhanced the yield and ultimate strength. Whereas, the level of prestressing of the CFRP rod showed a significant improvement in the cracking and yield strength. The developed FEM approach provides a reliable and versatile tool for optimizing strengthening designs of RC beams using prestressed NSM CFRP bars.</p>

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Nonlinear finite element modeling of RC beams strengthened with prestressed near-surface mounted (NSM) CFRP bars

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Abeer A. Al Dalou,
  • Wasim S. Barham,
  • Nasser Al-Huthaifi

摘要

Nowadays, researchers have focused on strengthening reinforced concrete (RC) beams with prestressed fiber-reinforced polymer (FRP) composite over the conventional non-prestressed systems. This study presents a detailed nonlinear finite element modeling (FEM) of reinforced concrete (RC) beams strengthened with prestressed near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) bars. The numerical models were developed using ABAQUS software, incorporating concrete damage plasticity to capture cracking, crushing, and stiffness degradation, while CFRP-bar rupture was modeled using Extended Finite Element Modeling (XFEM). The models were then validated using experimental test results published in a well-known journal. Then, the validated FEM were used in a comprehensive parametric study investigating the behavior of control, strengthened with non-prestressed and prestressed CFRP rods, demonstrating good agreement in load–deflection behavior, failure modes, and ultimate capacities. Parametric analyses were conducted to assess the effects of concrete compressive strength, steel reinforcement ratio, number of FRP rods, level of prestressing, and type of FRP rod. The findings confirm that concrete compressive strength, steel reinforcement ratio, and the number of FRP rods significantly enhanced the yield and ultimate strength. Whereas, the level of prestressing of the CFRP rod showed a significant improvement in the cracking and yield strength. The developed FEM approach provides a reliable and versatile tool for optimizing strengthening designs of RC beams using prestressed NSM CFRP bars.