Behavior of Reinforcement Ratio on Concrete Beams Reinforced with Lab Spliced GFRP Bar

????????? ?????? ???????????? ??????????????? ????????????, ?????? ?????????????????? ????????? ?????? ?????? ????????? GFRP ??????????????? ????????? ???????????? ??????. ?????? ?????? GFRP??? ??????????????? ????????? ?????? ????????? ?????? ?????????, ????????? ????????? ??????????????? ???????????? ????????? ?????? ?????? ???????????? ?????? ????????? ?????? ?????? ????????? ?????? ?????? ?????? ????????? ?????? ?????? ???????????? ?????? ?????? ????????????. ?????? ??? ??????????????? ??????????????? GFRP ???????????? ?????? ???????????? ?????????-?????? ????????? ?????? ????????? ????????? ???????????????. ?????? ????????? GFRP??? ???????????? ?????? ????????? ?????? ????????? ??? 6?????? GFRP ?????? ???????????? ?????? ???????????? ???????????????. ?????? ???????????? 4000mm??? ????????? ????????? ????????? 12.7mm??? ????????? ????????? GFRP ???????????? ???????????????. ???????????? ??????????????? ????????? ????????? ???????????? ???????????? ?????? ?????? 2??? ?????? ????????? ???????????????. ?????? ?????? ??????????????? ????????? ?????? ?????? ????????? ????????? ???????????????. ?????? ????????? ??????????????? ?????? ?????? ???????????? ?????????????????? ?????? ????????? ???????????? ??????????????? ????????? ?????? ?????? ????????? ???????????? ???????????? ????????? ?????? ????????? ????????????. The use of glass-fiber-reinforced polymer (GFRP) bars in reinforced concrete (RC) structures has emerged as an alternative to traditional RC due to the corrosion of steel in aggressive environments. Although the number of analytical and experimental studies on RC beams with GFRP reinforcement has increased in recent decades, it is still lower than the number of such studies related to steel RC structures. This paper presents the experimental moment deflection relations of GFRP reinforced beam which are spliced. Test variables were different reinforcement ratio and cover thickness of GFRP rebars. Seven concrete beams reinforced with steel GFRP re-Bars were tested. All the specimens had a span of 4000mm, provided with 12.7mm nominal diameter steel and GFRP rebars. All test specimens were tested under 2-point loads so that the spliced region be subject to constant moment. The experimental results show that the ultimate moment capacity of beam increasing of the reinforcement ratio. Failure mode of these specimens was sensitively vary according to the reinforcement ratio. The change of beam effective depth, which was caused by cover thickness variation, controlled the maximum strength and deflection because of cover spalling in tension face.??? ????????? 2009?????? ??????(?????????????????????)??? ???????????? ????????????????????? ????????? ?????? ????????? ?????????(2009-0066646