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Title |
An Experimental Study to Prevent Debonding Failure of RC Beams Strengthened by AFRP Sheet
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Keywords |
아라미드섬유쉬트 ; 부착파괴 ; U보강 ; 에폭시 전단키 AFRP ; Debonging failure ; U-wrapping ; Epoxy shear-key |
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Abstract |
This study investigated the failure mechanism of RC beams strengthened with AFRP sheets. Total 5 half-scale RC beams were constructed and tested to estimate the effectiveness of various methods to prevent the debonding failure of AFRP sheets. From the experimental results, it was found that increasing bonded length or end U-wrappings does not prevent debonding failure. On the other hand, the beams with center U-wrappings and shear-keys reached the ultimate state with their sufficient performance. The center U-wrappings tended to control debonding of the longitudinal AFRP sheets because the growth of the longitudinal cracks along the edges of the composites was delayed. In case of shear-keys, it was sufficient to eliminate debonding and the beams failed by AFRP sheets rupture due to the sufficient bond mechanism.
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