article · Materials
This study investigated methods to strengthen shear-critical reinforced concrete (RC) beams, aiming to reduce their failure risk and enhance building safety. Researchers combined prestressing with near-surface mounted (NSM) rod approaches, testing nine strengthened RC beams alongside one unstrengthened control. Various techniques were employed, including internal prestressing (IP), external prestressing NSM (PNSM), and internal embedment (IE). The study evaluated structural behaviour, including cracking load, ultimate load, deflection, and stiffness. Key findings showed that five pairs of IP rods increased shear capacity by 70.4%, while five pairs of PNSM rods increased it by 57.8%. Internal prestressing proved more effective than external. The stiffness of strengthened beams also significantly improved, and a formula for calculating shear capacity was proposed.
This research is important because it offers practical methods to improve the safety and longevity of existing buildings. By strengthening reinforced concrete beams, the risk of structural failure can be significantly reduced, which is crucial for infrastructure resilience and public safety.
This research provides applied and tested methods for enhancing the shear capacity and stiffness of reinforced concrete beams. These techniques could be adopted by construction and civil engineering firms for retrofitting existing structures or for designing more robust new constructions. The proposed formula could aid engineers in practical application, suggesting a near-market readiness for these strengthening solutions.
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In this study, shear-critical reinforced concrete (RC) beams were strengthened by combining the prestressing and near-surface mounted (NSM) rods approaches. The potential danger of failure in such RC beams is a substantial concern as it is considered a potential threat. This study addresses its careful mitigation through experimental identification and numerical analysis to enhance the safety and sustainability of buildings by reducing the probability of failure risk for these RC beams. Nine of the ten RC beams that were tested had strengthened, and one had not. Internal prestressing (IP) within the beam body, external prestressing NSM (PNSM), internal embedment (IE) inside the beam with or without prestressing, and NSM are the strengthening technologies that were employed. The range of the extra shear reinforcement ratios (μs) was 0.87% to 1.60%. We investigated how strengthened beams behaved structurally in terms of the cracking load, ultimate load, load-deflection response, ultimate deflection, and stiffness. The insertion of five pairs of PNSM rods (μs = 1.45%) and five pairs of IP rods (μs = 1.6%), respectively, increased the beams' shear capacity by 57.8% and 70.4%. Shear capacity increased by 23.2% when three pairs of IE rods (μs = 1.02%) were installed. The prestressing location had an impact on shear capacity, with the interior case surpassing the external one. Compared to the control, the stiffness of the strengthened beams rose by 20%, 82%, and 84.4% when three, four, or five pairs of internal prestressing rods were added. A formula is proposed to calculate the shear capacity of all beams strengthened using various methods.
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DOI: 10.3390/ma17235701
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