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<p>Reinforced concrete (RC) column strengthening is crucial to address design errors, damage, and service life expiration, as well as to meet evolving code requirements. Carbon fiber-reinforced polymer (CFRP) sheets and steel fibers improve ductility, load-carrying capacity, and structural performance. Here, the numerical eccentric behavior of 24 CFRP-confined RC columns with height-to-width ratios (<i>L/h</i>) of 4.2 and 8.3 containing steel fibers was investigated, and the parameters of loading capacity, stiffness, dissipated energy, and yielding load and its corresponding displacement were evaluated. The numerical model demonstrated acceptable accuracy, with average deviations from empirical data of 6, 2, and 2% for initial stiffness, ultimate axial capacity, and dissipated energy, respectively. The results showed that steel fibers effectively prevent premature concrete damage at small displacements, and CFRP significantly enhances the ultimate axial strength of the columns. Comparing the modeling results of fibrous RC columns with <i>L/h</i> = 4.2 with those of the plain concrete specimens shows that the dissipated energy and axial capacity values increase, and using the CFRP wrap leads to a further rise in these properties. However, these improvements are significantly smaller in the slender columns with <i>L/h</i> = 8.3. Finally, a parametric study was conducted after validating the proposed numerical model. The results revealed that increasing the CFRP thickness enhances the ultimate strength by up to 5% but reduces ductility, while enlarging the reinforcement ratio can increase the load-carrying capacity by as much as 24% at higher eccentricities.</p>

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Eccentric axial compressive performance of CFRP-wrapped steel fiber-reinforced RC columns: analytical modeling and evaluation

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Farhad Shakibanasab,
  • Mahdi Nematzadeh,
  • Alireza Shadi,
  • Masoud Babaei

摘要

Reinforced concrete (RC) column strengthening is crucial to address design errors, damage, and service life expiration, as well as to meet evolving code requirements. Carbon fiber-reinforced polymer (CFRP) sheets and steel fibers improve ductility, load-carrying capacity, and structural performance. Here, the numerical eccentric behavior of 24 CFRP-confined RC columns with height-to-width ratios (L/h) of 4.2 and 8.3 containing steel fibers was investigated, and the parameters of loading capacity, stiffness, dissipated energy, and yielding load and its corresponding displacement were evaluated. The numerical model demonstrated acceptable accuracy, with average deviations from empirical data of 6, 2, and 2% for initial stiffness, ultimate axial capacity, and dissipated energy, respectively. The results showed that steel fibers effectively prevent premature concrete damage at small displacements, and CFRP significantly enhances the ultimate axial strength of the columns. Comparing the modeling results of fibrous RC columns with L/h = 4.2 with those of the plain concrete specimens shows that the dissipated energy and axial capacity values increase, and using the CFRP wrap leads to a further rise in these properties. However, these improvements are significantly smaller in the slender columns with L/h = 8.3. Finally, a parametric study was conducted after validating the proposed numerical model. The results revealed that increasing the CFRP thickness enhances the ultimate strength by up to 5% but reduces ductility, while enlarging the reinforcement ratio can increase the load-carrying capacity by as much as 24% at higher eccentricities.