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Title |
Evaluation on the Bond Stress-slip Relationship of GFRP Reinforcing Bars with Spiral Ribs
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Authors |
이혜진(Hye-Jin Lee) ; 양근혁(Keun-Hyeok Yang) ; 김시준(Si-Jun Kim) ; 박상훈(Sang-Hun Park) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.1.031 |
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Keywords |
GFRP 보강근 ; 부착강도 ; 부착응력-미끄러짐 관계 ; 설계기준 ; 콘크리트 압축강도 reinforcing bars ; bond strength ; bond stress-slip relationship ; code provision ; concrete compressive strength |
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Abstract |
The present study examined the reliability of code equations for the bond strength of GFRP reinforcing bars with spiral ribs and proposed a generalized model for bond stress-slip relationship of such bars based on test results. The test parameters investigated for the bond stress-slip relationship of GFRP bars were the design compressive strength (20 MPa, 40 MPa, and 60 MPa) of concrete and nominal bar diameter (6 mm, 9 mm, and 12 mm). The ACI 440 equations considerably overestimate the bond strength of GFRP bars, whereas the JSCE equations underestimate the bond strength. The CSA equations give better predictions than the above code equations, but tend to overestimate test resutls when the concrete compressive strength is 53 MPa. The proposed models for the bond stress-slip relationship are in good agreement with test results exhibiting a non-linear parabolic shape.
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