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Title |
Effect of Shear Key and Edge Length of Near Surface-Mounted FRP Plate in Concrete
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DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.1.041 |
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Keywords |
부착실험 ; 전단키 ; 연단길이 ; 표면매입보강 ; FRP 판 ; 위치와 규격 ; 부착 미끄러짐 Bond test ; Shear key ; Edge length ; Near surface-mounted retrofit ; FRP plate ; Location and size ; Bond slip |
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Abstract |
This paper presents a bond test to find the effect of shear key and edge length from the bonded FRP in near surface-mounted(NSM) retrofit using FRP plate. Main parameters in the test are the location and size of shear key and the edge length. For the test, 10 specimens were made by embedding FRP plate of 3.6 ㎜×16 ㎜ into 400 ㎜×200(300) ㎜×400 ㎜ concrete block and fixing it by using epoxy. Tensile load was applied to the FRP of the specimens until failure and was recorded at each load increase. In addition, the bond slip and elongation of FRP were measured during the test. From the test, it was found that the further the shear key located from the loading, the higher strength we could get. The bond strength inversely depended on the size of shear key. Especially, when the size of shear key was to be lagger than certain size, the bond strength decreased to very low value; even less than that of the case without shear key. The bond strength somewhat increased corresponding to the increase of edge length from the bonded end of FRP to loading in spite of same bond length. The bond-slip between FRP and concrete governed overall deformation in the bond test of NSM FRP so that the effect of excessive slip is necessary to be considered in the design.
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