합성섬유로프 인장재로 보강된 RC보의 휨거동

This paper summarizes the results from the experimental study performed to investigate the structural behaviors of reinforced concrete beams strengthened by the composite fiber ropes tendons developed in this research. The rope braided with the UHMWPE fiber is excellent in the respect of strength but its failure mode is undesirably brittle. Steel turn-buckles developed in this research are connected at the middle of the fiber rope tendons and used as a device to control the magnitude of pretension forces and the failure mode of the tendons at the same time. The magnitude of pretension forces of the tendons and the strength capacity ratio between the ropes and the turn-buckles are considered as the major variables for the experimental analysis. Six beams were tested to investigate the structural performance of the proposed tendons used for rehabilitation works of reinforced concrete beams, such as failure modes, strength, stiffness and ductility. Results from this study show that the reinforced concrete beams rehabilitated by proposed method could have the maximum flexural moment capacity improved more than 140%, and the deformation ductility improved to be larger than 11.0. It implies that the proposed composite tendon possesses excellent performances in structural behavior, especially in the respects of flexural deformation and strength. And the proposed system could be used effectively for the rehabilitation works of reinforced concrete beams.