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<p>In this research, experimental and numerical investigations on the response of reinforced concrete (RC) deep beams strengthened by Near Surface Mounted (NSM) glass fiber reinforced polymer (GFRP) bars is presented. Fourteen RC deep beam specimens were subjected to two points load at two different shear span to effective depth (a/d) ratios. One beam specimen was un-strengthened and used as a reference beam, while the other thirteen specimens were strengthened with different inclination angles, spacing, and diameters of NSM GFRP bars. Tests results have shown that using inclined NSM GFRP bars improves the load-carrying capacity of strengthened beams by about 36% compared to that using vertical NSM GFRP bars. It has also been shown that when 50% of the epoxy adhesive is replaced by cement mortar as a bonding agent, the shear capacity of the strengthened RC deep beams decreases by 4.4% compared to that when 100% of the epoxy is used. Further, the study suggests and validates a numerical model to simulate the experimental tests conducted in the study. Numerical results have revealed that the ultimate load of the strengthened deep beams can be increased up to 70% by increasing the diameter of NSM GFRP bars. Also, the maximum load of the strengthened RC beam is increases by 10–30 % when the spacing between NSM GFRP bar is decreased from 150 to 100 mm.</p>

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Strengthening of RC Deep Beams Using NSM GFRP Bars

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Haitham Al-Thairy,
  • Alyaa Abdul Hussien Aadil

摘要

In this research, experimental and numerical investigations on the response of reinforced concrete (RC) deep beams strengthened by Near Surface Mounted (NSM) glass fiber reinforced polymer (GFRP) bars is presented. Fourteen RC deep beam specimens were subjected to two points load at two different shear span to effective depth (a/d) ratios. One beam specimen was un-strengthened and used as a reference beam, while the other thirteen specimens were strengthened with different inclination angles, spacing, and diameters of NSM GFRP bars. Tests results have shown that using inclined NSM GFRP bars improves the load-carrying capacity of strengthened beams by about 36% compared to that using vertical NSM GFRP bars. It has also been shown that when 50% of the epoxy adhesive is replaced by cement mortar as a bonding agent, the shear capacity of the strengthened RC deep beams decreases by 4.4% compared to that when 100% of the epoxy is used. Further, the study suggests and validates a numerical model to simulate the experimental tests conducted in the study. Numerical results have revealed that the ultimate load of the strengthened deep beams can be increased up to 70% by increasing the diameter of NSM GFRP bars. Also, the maximum load of the strengthened RC beam is increases by 10–30 % when the spacing between NSM GFRP bar is decreased from 150 to 100 mm.