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Title |
Experimental Evaluation of Bond Strength of L-Shaped Steel with Flat-Plate Welded
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Authors |
정재원(Jae-Won Jeong) ; 양성주(Sung-Ju Yang) ; 황환명(Hwan-Myung Hwang) ; 김의용(Eui-Yong Kim) ; 김승훈(Seung-Hun Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.1.105 |
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Keywords |
ㄱ형강; 푸쉬아웃 실험; 힘 전달기구; 부착강도 L-shaped steel; Push-out test; Force transfer mechanisms; Bond strength |
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Abstract |
This study conducted the push-out tests to investigate the bond behavior of L-shaped steel members with welded flat-plate shear reinforcement embedded in RC (reinforced concrete) and SFRC (steel fiber?reinforced concrete). The test results showed that all specimens exhibited splitting failure, characterized by concrete splitting along the edge region of the embedded L-shaped steel. As the concrete cover thickness increased, both the maximum load and bond stress generally increased. When the cover thickness was increased by approximately 66.7%, the average bond stress of the F0 (RC) and F1 (SFRC) series increased by about 21.1% and 14.1%, respectively. In contrast, when the bond length was doubled, the average bond stress of the F0 and F1 series increased by about 44.0% and 2.6%, respectively. The average bond stress for all specimens of the F0 series was 3.44 MPa, which was about 2.0% different from 3.37 MPa of the F1 series. Therefore, it is judged that the steel fiber reinforcement is more effective in suppressing the rapid decrease in stiffness after the maximum load rather than improving the bond stress. Considering the safety factor, the lower 5% bond stress of the L-shaped steel specimen welded to the flat plate was calculated and evaluated as 1.88 MPa, and the lower 5% bond stress coefficient (k) normalized by the square root of the concrete compressive strength and the cover thickness correction factor was evaluated as k=0.324.
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