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Title |
Bond Properties of GFRP Rebar with Cover Thickness and Volume Fraction of Steel Fiber
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DOI |
https://doi.org/10.4334/JKCI.2012.24.6.761 |
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Keywords |
강섬유 ; GFRP 보강근 ; 피복두께 ; 부착응력-미끄러짐 ; 부착특성 steel fiber ; GFRP rebar ; cover thickness ; bond stress-slip ; bond properties |
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Abstract |
The purpose of this study is to investigate bond properties of GFRP used in SFRC (Steel fiber reinforced concrete) and normal concrete. The experimental variables were rebar diameter (D13, D16), steel fiber volume fraction (0~2%) and cover thickness (1.5db, 5.4db). The experimental results showed a different failure mode depending on the cover thickness. Through the tested specimens, splitting failure occurred for the specimens with small cover thickness and pull out failure occurred in the specimens with large cover thickness. Introduction of steel fiber caused the specimens to have more ductile behavior of bond stressslip after peak stress, but they did not increase the bond strength significantly. These failure modes were shown in both steel reinforcement and GFRP. However, from the difference of micro structure of bond failure mechanism between steel rebar and GFRP rebar, more ductile behavior was observed in GFRP-specimens after maximum bond strength was reached.
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