抄録
The purpose of this study is to investigate the flexural strengthening effects of RC beams with hybrid FRP sheets consisting of high modulus type of continuous carbon fibers. Based on a preliminary hybrid design by following rules of mixture for the hybridization of high strength and modulus types of carbon fibers, the hybrid fiber sheets are used to strengthen RC beams. Throughout a series of investigations on beam specimens under three point bending, it is clarified that the hybrid fiber sheets consisting of high modulus type of carbon fibers as an externally bonded reinforcement can be used to enhance effectively. The service ability performances of structures such as cracking load and other resistance behavior, stiffness and steel yielding load etc. Moreover, through a rational design of hybrid fiber sheets, the controlling of stress drops due to the gradual ruptures of fibers and the sufficient ductility by avoiding premature debonding can be realized practically. Finally, some indices for evaluating the strengthening effects with hybrid fiber sheets and the optimum mixture are also suggested and discussed in the paper.
