New Suggestion of Effective Moment of Inertia for Beams Reinforced with the Deformed GFRP Rebar

To fundamentally solve the problem of deterioration of concrete structures, it has been researched that the high durable concrete structure reinforced with the FRP rebar can be one of major solution to the newly-developed concrete structure. FRP rebar has lots of advantages such as non-corrosive, high performance and light weight against the conventional steel rebar. Among these kinds of FRP rebars, GFRP rebar has usually been considered as the best reinforcement because of its economic point of view. Even though the material capacity of the GFRP rebar was already investigated, there are some problems such as low modulus of elastic that will be cause for degrade of the serviceability of flexural concrete member reinforced with the GFRP rebar. Thus, the deflection characteristics of the GFRP rebar reinforced concrete structure should be considered then investigated. In this study, ACI 440 guideline (2003), ISIS Canada Design Manual (2001) and Toutanji et al. (2000) was considered for predicting the moment of inertia of the concrete beam reinforced with the GFRP rebar. And it was also evaluated that load-deflection relationship had a good accordance with the test and analysis result. In the result of this study, it could be estimated that the load-deflection relationship using the suggested equation of moment of inertia in this study indicated better accordance with the test result than that of the others until failure. ?????? ???????????? ????????? ?????? ????????? ??????????????? ???????????? ?????? ??????????????? ????????? ???????????????????????? ??????????????? ?????? ????????? ????????? ???????????? ?????? ?????????, ?????? ??????????????? ???????????? FRP rebar??? ????????? ???????????? ???????????????????????? ?????? ??????·?????? ??? ????????? ?????? ???????????? ????????????. ?????? ?????? ???????????????????????? ???????????? ???????????? ?????? ????????? FRP rebar????????? GFRP rebar??? ????????? ?????? ????????? ??? ????????? ?????? ???????????? ??????. ????????? GFRP rebar??? ????????? ???????????????????????? ?????? ???????????? ????????? ?????? ??? ???????????? ???????????? ????????? GFRP??? ?????? ??? ????????? ????????? ?????? ????????? ????????? ??????????????? ??? ????????? ???????????? ??????. ??? ??????????????? ????????? ?????? GFRP rebar??? ?????? ??????????????????????????? ?????? ?????? ????????? ?????? ????????? ??????????????????????????? ??????????????? ?????? ????????? ??????????????????, ??? ?????? ????????? ??????????????????????????? ???????????? ??????????????? ?????? ?????????????????? 50% ??????????????? ?????????????????????????????? ????????? ????????? ????????? ??? ???????????? ???????????? ?????? ????????????????????????????????? ?????? ?????? ?????? ?????????????????? ?????? ?????????????????? ???????????? ?????????????????? ????????? ???????????????. ????????? ??? ??????????????? ???????????? ???????????? ????????? ???????????? ????????? Toutanji et al. (2000)??? ??????????????????????????? ???????????? ???????????? ?????? GFRP rebar??? ????????? ?????????????????? ?????? ??????????????????????????? ???????????? ??????????????????, ??? ?????? ????????? ?????? ???????????? ??? ???????????? ?????????????????? ?????? ????????? ????????? ?????? ?????????????????? ??????-??????????????? ????????? ????????? ????????? ??? ?????? ????????? ???????????????