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<p>Coastal areas of Bangladesh frequently adopt low-rise building structures to minimize the effect of high wind and seismic loads. Economic and material resource constraints in those regions necessitate the utilization of low-strength concrete, yet substantial steel allocations within reinforced concrete (RC) columns to withstand large loads pose a challenge to achieving significant cost reductions. A practical approach is to replace traditional round bars with Steel Equal Angles (SEA) as reinforcement that significantly increases the confinement area of concrete sections and therefore increases the column’s load-bearing capacity. This study conducted experimental test and numerical analysis on eight 150&#xa0;mm×150&#xa0;mm low strength RC scale-down columns of 900&#xa0;mm height which were longitudinally reinforced with conventional 12&#xa0;mm diameter round bars, L 25 × 2 SEA, L 37.5 × 3 SEA and laterally tied with 8&#xa0;mm diameter round bars for ultimate load capacity and displacement to investigate the effect of replacing the conventional round bar with SEA bars. Specimens reinforced with L25 × 2 SEA (A-96-1) showed 9% and 3% higher ultimate load capacity than conventional round bar reinforced specimens during the experimental test and numerical analysis, respectively, while utilizing a 15% lesser steel area. Furthermore, these SEA reinforced columns exhibited improved ductility, as evidenced by their higher axial displacement and lateral deformation values compared to conventional round bar-reinforced columns. The study also observed that increasing the SEA’s steel area and leg length further improved ultimate load capacity, axial displacement, and lateral deformation. During the test program, L 37.5 × 3 SEA reinforced specimens showed the highest ultimate load capacity, axial displacement, and lateral deformation. The study highly recommends the use of SEA as longitudinal reinforcement for low-strength RC columns in the coastal region.</p>

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Structural responses of low-strength RC columns made with steel equal angle (SEA)

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Md. Rabiul Alam,
  • Atique Ishrak Anik,
  • Md. Zakaria Hossain,
  • Md. Asirul Hasan Sourav

摘要

Coastal areas of Bangladesh frequently adopt low-rise building structures to minimize the effect of high wind and seismic loads. Economic and material resource constraints in those regions necessitate the utilization of low-strength concrete, yet substantial steel allocations within reinforced concrete (RC) columns to withstand large loads pose a challenge to achieving significant cost reductions. A practical approach is to replace traditional round bars with Steel Equal Angles (SEA) as reinforcement that significantly increases the confinement area of concrete sections and therefore increases the column’s load-bearing capacity. This study conducted experimental test and numerical analysis on eight 150 mm×150 mm low strength RC scale-down columns of 900 mm height which were longitudinally reinforced with conventional 12 mm diameter round bars, L 25 × 2 SEA, L 37.5 × 3 SEA and laterally tied with 8 mm diameter round bars for ultimate load capacity and displacement to investigate the effect of replacing the conventional round bar with SEA bars. Specimens reinforced with L25 × 2 SEA (A-96-1) showed 9% and 3% higher ultimate load capacity than conventional round bar reinforced specimens during the experimental test and numerical analysis, respectively, while utilizing a 15% lesser steel area. Furthermore, these SEA reinforced columns exhibited improved ductility, as evidenced by their higher axial displacement and lateral deformation values compared to conventional round bar-reinforced columns. The study also observed that increasing the SEA’s steel area and leg length further improved ultimate load capacity, axial displacement, and lateral deformation. During the test program, L 37.5 × 3 SEA reinforced specimens showed the highest ultimate load capacity, axial displacement, and lateral deformation. The study highly recommends the use of SEA as longitudinal reinforcement for low-strength RC columns in the coastal region.