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<p>This study investigates the load-carrying capacity of carbon-fiber-reinforced polymer (CFRP)-confined circularized rectangular reinforced concrete (RC) columns compared with that of corner-rounded ones, followed by theoretical analyses. Experiments were conducted on 12 RC columns with sections of 150 × 200&#xa0;mm: two were control columns, five were rounded at the corners, and five were circularized. The corner-rounded and circularized columns were wrapped with five CFRP configurations of 0.33–2.0 layers and were then axially loaded until failure. The results indicated that the CFRP-wrapped circularized RC columns failed by simultaneous CFRP rupture with strong explosions, while the CFRP-wrapped corner-rounded RC columns failed by local rupture of the CFRP with weak explosions. Strong explosions removed the concrete from the middle of the CFRP-confined circularized RC columns, forming two conical parts. In contrast, small explosions of CFRP-confined corner-rounded columns did not change the shape of these columns due to local ruptures of the CFRP. Importantly, the ultimate load of the circularized RC columns confined with 1.0–2.0 CFRP layers significantly increased by 2.9–4.2 times that of the control columns. In contrast, the ultimate load of the corner-rounded RC columns confined with 1.0–2.0 CFRP layers moderately increased by 1.4–1.7 times that of the control columns. The failure modes and ultimate load results confirmed the high effectiveness of the circularizing method before the CFRP wrapping. In the theoretical analyses, previously developed models for CFRP-confined circular and rectangular sectional specimens were used to predict the ultimate loads of the tested columns. Although some simplifications were made, these models demonstrated good accuracy in predicting the ultimate loads of both circularized and corner-rounded RC columns confined with CFRP. The results of this study provided an overall comparison of the two methods and confirmed the superiority of the circularization method, which can be useful for engineers in upgrading the load-carrying capacity of RC columns.</p>

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Axial Strengths of Circularized and Corner-Rounded Rectangular Reinforced Concrete Columns Confined with CFRP

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Tung D. Dang,
  • Canh Tuan Nguyen,
  • Vui Van Cao

摘要

This study investigates the load-carrying capacity of carbon-fiber-reinforced polymer (CFRP)-confined circularized rectangular reinforced concrete (RC) columns compared with that of corner-rounded ones, followed by theoretical analyses. Experiments were conducted on 12 RC columns with sections of 150 × 200 mm: two were control columns, five were rounded at the corners, and five were circularized. The corner-rounded and circularized columns were wrapped with five CFRP configurations of 0.33–2.0 layers and were then axially loaded until failure. The results indicated that the CFRP-wrapped circularized RC columns failed by simultaneous CFRP rupture with strong explosions, while the CFRP-wrapped corner-rounded RC columns failed by local rupture of the CFRP with weak explosions. Strong explosions removed the concrete from the middle of the CFRP-confined circularized RC columns, forming two conical parts. In contrast, small explosions of CFRP-confined corner-rounded columns did not change the shape of these columns due to local ruptures of the CFRP. Importantly, the ultimate load of the circularized RC columns confined with 1.0–2.0 CFRP layers significantly increased by 2.9–4.2 times that of the control columns. In contrast, the ultimate load of the corner-rounded RC columns confined with 1.0–2.0 CFRP layers moderately increased by 1.4–1.7 times that of the control columns. The failure modes and ultimate load results confirmed the high effectiveness of the circularizing method before the CFRP wrapping. In the theoretical analyses, previously developed models for CFRP-confined circular and rectangular sectional specimens were used to predict the ultimate loads of the tested columns. Although some simplifications were made, these models demonstrated good accuracy in predicting the ultimate loads of both circularized and corner-rounded RC columns confined with CFRP. The results of this study provided an overall comparison of the two methods and confirmed the superiority of the circularization method, which can be useful for engineers in upgrading the load-carrying capacity of RC columns.