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Torsional strengthening of RC beams using NSM CFRP rope and innovative adhesives

机译：使用NSM CFRP绳和创新粘合剂对钢筋混凝土梁进行扭转加固

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摘要

The strength of reinforced concrete (RC) members can be increased by bonding carbon fibre-reinforced polymers (CFRP) using externally-bonded reinforcement (EBR) and near-surface mounted (NSM) techniques. However, to date few studies in the area of torsional strengthening have been performed using NSM methods. Although the efficacy of increasing the flexural and shear strength of RC beams has been well reported using the NSM technique bonded with epoxy resins, the poor performance of epoxy in high-temperature environments and toxic fumes have been motivating factors for using new cement-based adhesives as a replacement adhesive for epoxy in several studies. This paper investigates the torsional behaviour of RC beams strengthened using NSM FRP laminates and FRP ropes. An epoxy adhesive was used in four beams and a new cement-based adhesive was utilised in the remaining four beams and used to evaluate the torsional capacity. Both CFRP laminates and CFRP ropes were embedded into pre-cut grooves. According to the results, the torsional behaviour of the beams strengthened with CFRP ropes was superior to that of the beams strengthened with CFRP laminate when using epoxy resin and cement-based adhesive. Generally, the epoxy was more effective in increasing the torsional strength than the cement-based adhesive.
机译：可以通过使用外部粘结的钢筋（EBR）和近表面安装（NSM）技术粘结碳纤维增强的聚合物（CFRP）来增强钢筋混凝土（RC）构件的强度。然而，迄今为止，使用NSM方法在扭转加强领域的研究很少。尽管已使用NSM技术与环氧树脂粘合来提高RC梁的抗弯强度和抗剪强度的功效得到了很好的报道，但在高温环境下环氧树脂的不良性能和有毒烟雾一直是使用新型水泥基粘合剂的动力因素在几项研究中用作环氧树脂的替代粘合剂。本文研究了使用NSM FRP层压板和FRP绳索加强的RC梁的扭转性能。在四根横梁中使用了环氧胶，其余四根横梁中使用了新的水泥基胶，用于评估扭转能力。 CFRP层压板和CFRP绳索均嵌入到预先切割的凹槽中。根据结果​​，在使用环氧树脂和水泥基胶粘剂时，CFRP钢丝绳加固的梁的抗扭性能优于CFRP层压板加固的梁的抗扭性能。通常，环氧树脂在提高抗扭强度方面比水泥基粘合剂更有效。

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