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Title |
Seismic Performance Evaluation of Torque-Controlled Expansion Anchor for Non-Structural Anchorage Design
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Authors |
채경훈(Kyoung-Hun Chae) ; 임정국(Jeong-Guk Im) ; 박태원(Tae-Won Park) ; 허무원(Moo-Won Heo) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.5.553 |
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Keywords |
비틀림 제어 확장앵커; 균열 콘크리트; 내진성능평가; 잔류강도 torque-controlled expansion anchor; crack concrete; seismic performance; residual strength |
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Abstract |
In this study, the seismic performance of torque-controlled expansion anchors with improved structural details (sleeve and header) was evaluated. Simulated seismic tension tests were conducted to assess the anchors seismic performance in accordance with the service-condition tests outlined in the “Concrete Anchor Design Method and Example Book (KCI-M-24-018)”. The repeated load tests showed that no damage or failure occurred in any of the anchors up to the end of the test, and the monotonic load tests confirmed that the average residual tension strength of all anchors attained or exceeded the evaluation criterion of 1.6Neq. The failure mode of all anchors was characterized by concrete breakout failure accompanied by radial cracking. This result is attributable to the improved structural details, which provide high tension resistance that effectively inhibits cracking and the effects of repeated loading, thereby evenly distributing the external load over the concrete substrate. In addition, the characteristic strength (F5%) of all the anchors tested was higher than the nominal strength (Nn) as determined by the domestic anchor design formula. Therefore, it was confirmed that the torque-controlled expansion anchor with improved structural details is suitable for non-structural materials that require seismic design through high seismic tensile resistance.
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