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<p>The shear failure of reinforced concrete beams (RC) occurs without warning. A new approach for improving the strength of reinforced concrete elements is called near-surface mounting (NSM), which is applied to strengthen or repair RC members. However, limited studies use FRP bars to enhance NSM on RC deep beams. This work investigated the behavior of ten reinforced concrete deep beams strengthened in shear using NSM-CFRP bars. All beams have the same dimensions 450&#xa0;mm × 140&#xa0;mm × 1200&#xa0;mm with a shear span to the effective depth ratio of 0.864. Tow-reinforced concrete deep beams acted as control beams and were tested with and without stirrups. Eight beams acted as strengthened beams and were divided into two categories. Under reinforced shear beams, the first category consists of four strengthened beams with steel stirrups. The second category is unreinforced shear beams, which consist of four strengthened beams without stirrups. The NSM-CFRP technique was experimented with two selected inclination angles of installed CFRP bars at 0°/90° or 45°/135°, and spacing was at 100&#xa0;mm or 150&#xa0;mm. All beams were tested using a four-point bending test. The experimental investigation observed that using NSM CFRP bars increased the shear capacity enhancement from 18.3 to 151.3% compared to the control beams. Later, the numerical results are validated with the experimental observations using ABAQUS software. The maximum difference in ultimate shear load was recorded as 10% between the experimental and numerical results. The current study concluded that using NSM CFRP bars increases the shear strength of RC deep beams.</p>

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Experimental and numerical investigation of RC deep beams strengthened in shear using NSM-CFRP bars technique with and without steel stirrups

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Mohanad Hatem Shadhar,
  • Douread Raheem Hassen,
  • Yasser M. Kadhim,
  • Alaa Salahuddin Araibi,
  • Omar R. Khaleel,
  • Bilal Muiassar M. Salih,
  • Abdul Aziz Abdul Samad,
  • Malik M. Mohammed,
  • Hayder A. Alalwan

摘要

The shear failure of reinforced concrete beams (RC) occurs without warning. A new approach for improving the strength of reinforced concrete elements is called near-surface mounting (NSM), which is applied to strengthen or repair RC members. However, limited studies use FRP bars to enhance NSM on RC deep beams. This work investigated the behavior of ten reinforced concrete deep beams strengthened in shear using NSM-CFRP bars. All beams have the same dimensions 450 mm × 140 mm × 1200 mm with a shear span to the effective depth ratio of 0.864. Tow-reinforced concrete deep beams acted as control beams and were tested with and without stirrups. Eight beams acted as strengthened beams and were divided into two categories. Under reinforced shear beams, the first category consists of four strengthened beams with steel stirrups. The second category is unreinforced shear beams, which consist of four strengthened beams without stirrups. The NSM-CFRP technique was experimented with two selected inclination angles of installed CFRP bars at 0°/90° or 45°/135°, and spacing was at 100 mm or 150 mm. All beams were tested using a four-point bending test. The experimental investigation observed that using NSM CFRP bars increased the shear capacity enhancement from 18.3 to 151.3% compared to the control beams. Later, the numerical results are validated with the experimental observations using ABAQUS software. The maximum difference in ultimate shear load was recorded as 10% between the experimental and numerical results. The current study concluded that using NSM CFRP bars increases the shear strength of RC deep beams.