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<p>The axial compressive strength and ductility of large size square concrete columns wrapped with carbon fiber reinforced polymer (CFRP) under uniaxial compressive loading were investigated in this study, considering the effects of column size, confinement ratio, and concrete strength. Parametric FEA studies on the effects of mesoscale column size and concrete strength on the axial load capacity of CFRP-confined concrete columns were conducted. The American Concrete Institute (ACI 440.2R-17) and the Canadian Standards Association (CSA-S806-12) codes or provisions were also used to compare the finite element analysis results. The findings demonstrated that the axial compressive strength of CFRP-constrained square concrete columns is inversely correlated with the size effect. The impact of size on axial compressive strength decreases as the confinement ratio increases. CFRP confinement works better in low-strength concrete than in high-strength RC columns. The size effect also exhibits an inverse correlation with concrete strength. Compared to CSA-S806-12, the finite element numerical models showed nearly identical axial compressive stress–strain predictions with the ACI 440.2R-17 code provision. This research reveals significant relationships (supported by the Design of Experiments, the DoE) between column size, confinement ratio, concrete strength, and compressive strength of CFRP-confined concrete columns. These factors would be considered when applying CFRP confinement, especially for enormous square columns and seismic-prone regions.</p>

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The Role of Size in the Axial Strength Behavior of Square Concrete Columns Confined with Carbon Fiber Reinforced Polymer

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Muzey Desta Gebremedhin,
  • Tesfaye Alemu Mohammed,
  • Yohannes Tesfay,
  • Kağan Eryürük

摘要

The axial compressive strength and ductility of large size square concrete columns wrapped with carbon fiber reinforced polymer (CFRP) under uniaxial compressive loading were investigated in this study, considering the effects of column size, confinement ratio, and concrete strength. Parametric FEA studies on the effects of mesoscale column size and concrete strength on the axial load capacity of CFRP-confined concrete columns were conducted. The American Concrete Institute (ACI 440.2R-17) and the Canadian Standards Association (CSA-S806-12) codes or provisions were also used to compare the finite element analysis results. The findings demonstrated that the axial compressive strength of CFRP-constrained square concrete columns is inversely correlated with the size effect. The impact of size on axial compressive strength decreases as the confinement ratio increases. CFRP confinement works better in low-strength concrete than in high-strength RC columns. The size effect also exhibits an inverse correlation with concrete strength. Compared to CSA-S806-12, the finite element numerical models showed nearly identical axial compressive stress–strain predictions with the ACI 440.2R-17 code provision. This research reveals significant relationships (supported by the Design of Experiments, the DoE) between column size, confinement ratio, concrete strength, and compressive strength of CFRP-confined concrete columns. These factors would be considered when applying CFRP confinement, especially for enormous square columns and seismic-prone regions.