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<p>Over time, torsional capacity of reinforced concrete (RC) members is decreasing due to the effects of different conditions over its entire service life such as structural damage, deterioration, eccentric loading, environmental influences, additional loading and so on. Therefore, the torsional capacity of RC members should be assessed and evaluated periodically to ensure adequate performance. For this purpose, repairing and strengthening of RC members in torsion have become an imperative requirement. This research presents an experimental and numerical study to improve the torsional strength of RC beams using Near Surface Mounted (NSM) Glass Fiber Reinforced Polymer (GFRP) stirrups. Eleven RC beams were considered in the experimental tests and underwent torsional loading until failure. Test observations in terms of first cracking torque, failure modes, ultimate torque, ultimate twist angle, and torque- twist angle behaviour were all evaluated and discussed. Experimental results demonstrated that the NSM GFRP stirrups enhance the ultimate torsional moment resistance of RC beams significantly. Results have also revealed that the closed NSM GFRP stirrups with opposite overlap at the corners of the beam section is the more effective configurations for torsional strengthening. Further, it has been concluded that the U-shape of NSM GFRP stirrups can be used as a viable and cost-effective solution for torsional strengthening of RC beams. The experimental findings also indicate that the torsional performance of the RC beam can be considerably improved using NSM GFRP stirrups compared to steel stirrups. This study also presented and validated a numerical model using the finite element software ABAQUS for deeper understanding of the torsional behavior RC beams strengthened by NSM GFRP stirrups. Numerical results demonstrated that the ultimate load capacity of the strengthened beams increases as the distance between stirrups decreases, and the strengthened beams exhibited the highest ultimate torque capacity when the inclination angle of the rings is set to 45°.</p>

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Torsional Behaviour and Failure Mechanism of RC Beams Strengthened by NSM GFRP Stirrups

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Haitham Al-Thairy,
  • Ahmed Al-Ziady,
  • Muhaamd Ali Jabur

摘要

Over time, torsional capacity of reinforced concrete (RC) members is decreasing due to the effects of different conditions over its entire service life such as structural damage, deterioration, eccentric loading, environmental influences, additional loading and so on. Therefore, the torsional capacity of RC members should be assessed and evaluated periodically to ensure adequate performance. For this purpose, repairing and strengthening of RC members in torsion have become an imperative requirement. This research presents an experimental and numerical study to improve the torsional strength of RC beams using Near Surface Mounted (NSM) Glass Fiber Reinforced Polymer (GFRP) stirrups. Eleven RC beams were considered in the experimental tests and underwent torsional loading until failure. Test observations in terms of first cracking torque, failure modes, ultimate torque, ultimate twist angle, and torque- twist angle behaviour were all evaluated and discussed. Experimental results demonstrated that the NSM GFRP stirrups enhance the ultimate torsional moment resistance of RC beams significantly. Results have also revealed that the closed NSM GFRP stirrups with opposite overlap at the corners of the beam section is the more effective configurations for torsional strengthening. Further, it has been concluded that the U-shape of NSM GFRP stirrups can be used as a viable and cost-effective solution for torsional strengthening of RC beams. The experimental findings also indicate that the torsional performance of the RC beam can be considerably improved using NSM GFRP stirrups compared to steel stirrups. This study also presented and validated a numerical model using the finite element software ABAQUS for deeper understanding of the torsional behavior RC beams strengthened by NSM GFRP stirrups. Numerical results demonstrated that the ultimate load capacity of the strengthened beams increases as the distance between stirrups decreases, and the strengthened beams exhibited the highest ultimate torque capacity when the inclination angle of the rings is set to 45°.