슬리브 및 헤드 길이에 따른 후설치 앵커의 인발성능평가
Performance Evaluation of Post-installed Anchor according to Sleeve Length and Header Length
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초록
본 연구에서는 기존의 후설치 앵커의 헤드 부분과 확장슬리브 부분을 개선한 후설치 앵커를 개발하고자 한다. 최적형상을 시뮬레이션 해석을 수행하여 후설치 행커의 확장슬리브와 헤더의 길이를 결정하였다. FEM 해석 결과, 최적 슬리브 길이(9.0㎜)와 헤더 길이(3.0㎜)를 선정하였다. 개선 후 후설치 앵커의 인발강도 실험 결과, 모든 실험체에서 변동계수 15%를 만족하는 것으로 나타났다. 개선 전․후의 묻힘 깊이에 따른 인발강도를 비교한 결과, 묻힘 깊이가 50㎜인 경우에는 1.25배 증가하였고, 묻힘깊이가 70㎜인 경우에는 1.54배 증가하였다. 고강도 콘크리트의 경우에는 묻힘 깊이가 50㎜인 경우에는 1.28배 증가하였고, 묻힘깊이가 70㎜인 경우에는 1.55배 증가하는 것으로 나타났다. 또한, 전단강도 실험결과, 개선 후 앵커가 내력이 1.38배 증가하는 것으로 나타났다.
Abstract
This study presents post-installed anchors whose heads and extension sleeves are improved. The optimal lengths of the extension sleeves and headers were analytically determined by simulations. As a result of analysis using Finite element method (FEM), 9.0mm and 3.0mm were determined as the optimal lengths of sleeves and headers respectively. In pull-out tests using the improved post-installed anchors, all specimens satisfied the coefficient of variation of 15%. Comparing the pull-out strengths of existing anchors and the improved anchors, it was increased by 1.25 times for anchors embedded with a depth of 50mm, and 1.54 times for 70mm. In the cases of high-strength concrete, the strengths were increased by 1.28 and 1.55 times for 50mm and 70mm respectively. Moreover, as a result of shear tests, the improved anchors perform the greater strength of 1.38 times than the existing anchors.
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