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Title |
Evaluation of the Effect of Coupler on the Ductility of Rebar by Uniaxial Tensile Test
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Authors |
우태련(Tae-Ryeon Woo) ; 이종한(Jong-Han Lee) ; 정진환(Jin-Hwan Cheung) ; 정치영(Chi-Young Jung) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.1.090 |
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Keywords |
커플러 이음 철근 ; 인장시험 ; 연성도 ; 커플러 길이 Spliced rebar ; Tensile test ; Ductility ; Coupler length |
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Abstract |
Recently, various reinforced concrete joints have been used in reinforced concrete structures. Therefore, it is important to grasp the tensile properties of the spliced rebar. In this study, uniaxial tensile tests were conducted on Grade 60 D22(#7), D29(#9), and two kinds of couplers manufactured according to ASTM A615 standard for evaluating ductility of coupler joints. The strain was measured using an image processing method more accurate and capable of measuring at various points freely. As the result of uniaxial tensile test, it was possible to calculate the stress-strain relationship and the longitudinal strain distribution according to the stress stages and it was founded that the average strain becomes lower as more occupying the coupler joint portions in the same gauge length. In addition, the empirical equations are proposed to account for the effect of the length of the coupler on the ultimate strain and the rupture strain.
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