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Title |
Flexural Adhesive Performance of RC Beams Strengthened by Carbon Fiber Sheets
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Authors |
유영찬 ; 최기선 ; 최근도 ; 김긍환 ; 이한승 |
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Keywords |
탄소섬유쉬트; 부착길이; 설계용 부착강도; 부착파괴; 에폭시; CFRP (carbon fiber reinforced polymer); bond length; design bond strength; bond failure; epoxy |
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Abstract |
Tensile strength of CFRP (Carbon Fiber Reinforced Polymer) is approximately 10 times higher than that of the steel reinforcement, but the design strength of CFRP is normally limited by unpredictable bond failure between RC and CFRP. Many researches concerned with bond behavior between RC and CFRP have been carried out to prevent the bond failure of RC beam strengthened by CFRP, but the national design code for design bond strength of CFRP has not been constructed. In this study, three beam specimens strengthened by CFRP under the parameters of bonded length were tested to derive the design bond strength of CFRP for the RC flexural members. Each bonded length was calculated based on the bond strength of JCI and CFRP manufacturing company. Also, another two beam specimens strengthened by CFRP were tested to inspect the construction environment effects such as mixing error of epoxy resin, and the amount of epoxy primer. From the test results, it is concluded that the maximum design bond strength of CFRP to RC flexural member is considered to be τa =8 kgf/㎠.
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