강판 및 CFS로 보강된 R/C보의 피로거동 특성 비교 연구

A Comparative Study in the Fatigue Behavior Characteristics of R/C Beams Strengthened with Steel Plate or Carbon Fiber Strengthened with Steel Plate or Carbon Fiber Sheet

The purpose of this study is to investigate the fatigue behavior of the reinforced concrete beams strengthened with steel plate and CFS(csrbon fiber sheet). In this study, fatigue loads of 60 to 80 percent of the ultimate strength are applied to the specimens. From the results of test the beams strengthened with steel plate show the flexural failure mode, while the specimens strengthened with CFS fail by separation between CFS and concrete surface. In case of the stress level of 70%, strength degradations of the beams with steel plate and CFS in normalized flexural rigidity at 5,000 cycles is 24 and is 24 and 28 percent respectively.