The present study investigates the performance of U-type clamp anchorage on external strengthening of reinforced concrete beams using carbon fibre-reinforced polymer composites. Unidirectional carbon fibre was used to strengthen the beam having a cross-section of 150 × 200 mm² and the fabricated U-type clamp was used as a clamping device to enhance the fibre-reinforced polymer (FRP) bonding. To test the beam, four-point bending system was adopted and the experimental parameters were the number of FRP layers. The failure mode of strengthened beams with U-type clamp was very similar (rupture of FRP composites) to the beams without U-type clamp. However, the delamination of FRP was evaded by counteracting the peeling stress development at the edge of fibre. Since the beams strengthened with U-type clamp exhibited more linear behaviour than that of the beams strengthened without U-type clamp, there may be a higher possibility for abrupt/rapid/brittle mode of failure and the ductility index of the beam with U-type clamp confirmed the above behaviour. However, the introduction of U-type clamp enhanced the flexural stiffness and ultimate strength by counteracting the debonding, and the beam with U-type clamp exhibited a maximum of 58.33% and 20.37% enhancement in flexural stiffness and ultimate strength than that of the beam without U-type clamp, respectively. The theoretical strength value of all strengthened beams was evaluated using models proposed in the previous research and compared with experimental results. It is inferred that the use of U-type clamp in FRP strengthening provides economic and structural benefits compared to a beam without U-type clamp.

本研究研究了使用碳纤维增强聚合物复合材料的U型夹箍锚固在钢筋混凝土梁的外部加固方面的性能。使用单向碳纤维加固横截面为150×200 mm ²的梁并使用制成的U型夹作为夹紧装置，以增强纤维增强聚合物（FRP）的粘合力。对梁进行测试，采用四点弯曲系统，实验参数为玻璃钢层数。带U型夹箍的加固梁的破坏模式与不带U型夹箍的梁的破坏模式非常相似（FRP复合材料的破裂）。然而，通过抵消纤维边缘的剥离应力发展，避免了FRP的分层。由于用U型夹钳加固的梁比不使用U型夹钳加固的梁表现出更多的线性行为，因此，使用U-型夹钳的梁突然/快速/脆性破坏和延性指标的可能性更高。型夹确认了上述行为。然而，U型夹钳的引入通过抵消脱胶作用提高了挠曲刚度和极限强度，带U型夹钳的梁的抗弯刚度和极限强度分别比不带U形的梁提高了58.33％和20.37％。型夹钳。使用先前研究中提出的模型对所有加固梁的理论强度值进行了评估，并与实验结果进行了比较。可以推断，与不带U型夹具的梁相比，在FRP加固中使用U型夹具提供了经济和结构上的好处。使用先前研究中提出的模型对所有加固梁的理论强度值进行了评估，并与实验结果进行了比较。可以推断，与不带U型夹具的梁相比，在FRP加固中使用U型夹具提供了经济和结构上的好处。使用先前研究中提出的模型对所有加固梁的理论强度值进行了评估，并与实验结果进行了比较。可以推断，与不带U型夹具的梁相比，在FRP加固中使用U型夹具提供了经济和结构上的好处。