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Journal of the Korea Concrete Institute

J Korea Inst. Struct. Maint. Insp.
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  • Korea Citation Index (KCI)

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Title Post-tensioning System with Externally Unbonded CFRP Strips for Strengthening RC Members
Authors 유영찬 ; 최기선 ; 김긍환
Page pp.147-154
ISSN 1226-6205
Keywords 탄소섬유판 ; 박리파괴 ; 외부 비부착 프리스트레스 ; 파단하중 CFRP strip ; Debonding failure ; Externally unbonded post-tensioning ; Rupture strength
Abstract Experimental study has been performed in order to investigate the behavior of RC beams strengthened with externally unbonded post-tensioned CFRP (Carbon Fiber Reinforced Polymer) strips using embedded or stud-type plate anchorages. Total 10 small-scaled specimens were manufactured with the different post-tensioning level and types of mechanical anchorage as a main test parameter. A control specimen and specimens with simply bonded CFRP strips were included to compare the structural performances of each system. From the test results, it was observed that the specimens strengthened with simply bonded CFRP strips showed debonding failure below 50% of CFRP tensile strength due to premature debonding. On the other hand, all the specimens strengthened with post- tensioned unbonded CFRP strips reached the rupture strength of the CFRP strip. Also, it was observed that the specimens with stud-type anchorage have equivalent strengthening performance compared with embedded-type anchorage.