Behavior According to Confinement of Compressive Concrete on Flexural Members Reinforced with FRP Bars

FRP bar??? ?????? ??????????????? ????????? ????????? ????????????????????? ????????? ??? ?????? ???????????? ???????????? ??????. ????????? FRP??? ???????????? ?????? ???????????? ????????? ???????????????????????? ?????? ????????? ?????? ??????, ??????????????? ????????? ????????? ??? ??????. ????????? ??? ??????????????? FRP ???????????? ????????? ???????????? ???????????? ????????? ??????????????? ???????????? ????????? ??????????????? ????????????, ??????????????? ????????? ??????????????? ?????? ??? ??????????????? ????????? ??? ?????????. The use of FRP bar as reinforced concrete beams is considered as one of the most prominent solution that may overcome the corrosion of reinforcing steel bars. However, in the case of FRP reinforced concrete, both the reinforcing and the reinforced materials are brittle. For this reason, ductility of structures with FRP reinforcement is much less than that of structures with steel reinforcements. In this study, a method has been suggested to provide a meaningful quantification of ductility for concrete beams reinforced with FRP bars. This paper shows which the confinement to the compression concrete by the spiral can increase the ductility of FRP over-reinforced concrete beams