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<p>The use of basalt fiber–reinforced polymer (BFRP) bars in reinforced concrete (RC) structures offers a promising solution to mitigate corrosion-related damage in reinforcement. While the current ACI 440.11–22 code permits the use of glass fiber–reinforced polymer (GFRP) bars in RC columns, there is limited information on the behavior of slender columns reinforced with BFRP. This study addresses this gap through an extensive experimental investigation into the performance of slender concrete columns reinforced with BFRP bars under axial loads. Eleven slender rectangular columns, each with a slenderness ratio of 34.6, were tested under concentric loading conditions. Key variables included the types of longitudinal and lateral reinforcement (BFRP versus steel), reinforcement ratios, lateral reinforcement spacing, and bar diameters. The results showed that BFRP-reinforced columns exhibited behavior similar to steel RC columns, with longitudinal BFRP bars contributing 7%–14% of the maximum load-carrying capacity. Notably, reducing tie spacing increased load capacity, and smaller diameter bars with closer spacing were more effective than larger bars with wider spacing at equivalent volumetric reinforcement ratios. Additionally, unequal strains on compression and tension sides indicated the presence of second-order effects due to the slenderness of the columns. To address this, a new model incorporating a buckling reduction factor is proposed, providing more accurate predictions of the maximum load-carrying capacity for slender BFRP RC columns.</p>

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Experimental study and buckling reduction model for BFRP RC slender columns: performance and design insights

  • 期刊论文

  • 发表日期：

    2025年5月3日

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  • Fkrat Latif Hamid,
  • Ali Ramadhan Yousif

摘要

The use of basalt fiber–reinforced polymer (BFRP) bars in reinforced concrete (RC) structures offers a promising solution to mitigate corrosion-related damage in reinforcement. While the current ACI 440.11–22 code permits the use of glass fiber–reinforced polymer (GFRP) bars in RC columns, there is limited information on the behavior of slender columns reinforced with BFRP. This study addresses this gap through an extensive experimental investigation into the performance of slender concrete columns reinforced with BFRP bars under axial loads. Eleven slender rectangular columns, each with a slenderness ratio of 34.6, were tested under concentric loading conditions. Key variables included the types of longitudinal and lateral reinforcement (BFRP versus steel), reinforcement ratios, lateral reinforcement spacing, and bar diameters. The results showed that BFRP-reinforced columns exhibited behavior similar to steel RC columns, with longitudinal BFRP bars contributing 7%–14% of the maximum load-carrying capacity. Notably, reducing tie spacing increased load capacity, and smaller diameter bars with closer spacing were more effective than larger bars with wider spacing at equivalent volumetric reinforcement ratios. Additionally, unequal strains on compression and tension sides indicated the presence of second-order effects due to the slenderness of the columns. To address this, a new model incorporating a buckling reduction factor is proposed, providing more accurate predictions of the maximum load-carrying capacity for slender BFRP RC columns.