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<p>This study investigates the shear behavior of reinforced concrete (RC) hollow deep beams with combined longitudinal and large transverse circular openings, and evaluates the effectiveness of strengthening using externally bonded steel plates. Eight RC deep beams (1500&#xa0;mm × 300&#xa0;mm × 450&#xa0;mm) with a concrete compressive strength of 40&#xa0;MPa were experimentally tested. This research lies in experimentally addressing the rarely studied interaction between continuous longitudinal hollows and large transverse web openings (up to 70% of beam depth), and in assessing the role of steel plate orientation under shear-dominated behavior. The results show that transverse openings of 44.4% and 70% of the beam depth reduced the ultimate shear capacity by 63.6% and 79.3%, respectively. Strengthening using steel plates significantly recovered the lost capacity, with horizontal plate orientation restoring up to 63.5% of the shear strength in beams with the largest openings, outperforming vertical plates. These findings provide new experimental evidence on the shear response and strengthening efficiency of RC hollow deep beams with complex opening configurations, offering practical guidance for structural design and retrofitting applications.</p>

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Shear resistance of reinforced concrete hollow deep beam with longitudinal and transverse openings strengthened by steel plates

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Abdulrahman Falih Hasan,
  • Ali Sabah Al Amli

摘要

This study investigates the shear behavior of reinforced concrete (RC) hollow deep beams with combined longitudinal and large transverse circular openings, and evaluates the effectiveness of strengthening using externally bonded steel plates. Eight RC deep beams (1500 mm × 300 mm × 450 mm) with a concrete compressive strength of 40 MPa were experimentally tested. This research lies in experimentally addressing the rarely studied interaction between continuous longitudinal hollows and large transverse web openings (up to 70% of beam depth), and in assessing the role of steel plate orientation under shear-dominated behavior. The results show that transverse openings of 44.4% and 70% of the beam depth reduced the ultimate shear capacity by 63.6% and 79.3%, respectively. Strengthening using steel plates significantly recovered the lost capacity, with horizontal plate orientation restoring up to 63.5% of the shear strength in beams with the largest openings, outperforming vertical plates. These findings provide new experimental evidence on the shear response and strengthening efficiency of RC hollow deep beams with complex opening configurations, offering practical guidance for structural design and retrofitting applications.