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Title |
Improvement in Fatigue Durability of RC Beams Strengthened with Carbon Fiber Sheets
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Authors |
박정용 ; 김성도 ; 조백순 ; 김인태 ; 정진환 |
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Keywords |
탄소섬유시트 ; 피로내구성 ; 반복횟수-처짐 관계 Carbon fiber sheets(CFS) ; Fatigue durability ; Load cycle-deflection relations |
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Abstract |
In recent investigations, reinforced concrete beams strengthened with Carbon Fiber Sheets (CFS) subjected to fatigue loading were reported to be failed at the ends of CFS by its debonding. U-shaped CFS were attached to both ends of the CFS when fatigue tests on strengthened beams were conducted to delay and/or prevent fatigue failures of adhesive interface. The experimental parameters of this study were the usage of anchorage at the ends of CFS, the number of CFS layers, and the applied load levels of 60%～90% of the static ultimate load obtained from the static tests. The failure modes and the load cycle-deflection relations were observed and discussed from the experimental results. Those results also showed that the U-shaped anchoring system changes the fatigue failure modes and influences greatly on the fatigue capacity of the strengthened beams.
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