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Title |
Tensile Performance of Torque-Controlled Expansion Anchors Affected by Failure Angle
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Authors |
임정국(Jeong-Guk Im) ; 채경훈(Kyoung-Hun Chae) ; 박태원(Tae-Won Park) ; 허무원(Moo-Won Heo) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.6.679 |
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Keywords |
후설치 앵커; 유효묻힘깊이; 파괴 각도; 파괴저항면적; 직경 post-installed anchor; failure area; failure angle; embedded depth; pull-out test |
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Abstract |
Post-installed anchors are widely used in concrete structures to connect structural and non-structural components due to their flexibility in installation and ease of construction. However, current design standards tend to evaluate anchor performance conservatively, as they do not adequately consider critical factors such as anchor diameter, concrete failure area, and failure angle. This study investigates the pullout strength and failure angle of torque-controlled expansion anchors (M10, M12, M16) through experimental testing under varying embedment depths. The results indicate that the measured pullout strengths generally exceeded the nominal strengths calculated by existing design formulas, suggesting that current standards may underestimate actual anchor performance. The gap between nominal and experimental strengths widened with increasing anchor diameter. Additionally, the failure angle was observed to increase as embedment depth decreased, likely due to intensified stress concentration near the surface, leading to steeper failure planes. These findings highlight the need for revised design formulas that incorporate embedment depth, anchor diameter, and failure angle to enable more accurate strength predictions.
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