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Title |
Concrete Breakout Strength of Cast-in High-Shear Ring Anchors in Shear Installed on Sides of Slabs
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Authors |
전상현(Sang Hyeon Jeon) ; 김문길(Mun-Gil Kim) ; 천성철(Sung-Chul Chun) ; 김재열(Jae Yeol Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2019.31.1.003 |
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Keywords |
고전단 링앵커 ; 전단 ; 콘크리트파괴 ; 앵커철근 High-Shear Ring Anchor ; shear ; concrete breakout ; anchor reinforcement |
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Abstract |
Shear load tests on cast-in High-Shear Ring Anchor (HRA) installed on the sides of slabs were conducted to investigate the structural behavior of concrete breakout. The test variables include slab thickness, anchor location, and placement of anchor reinforcement. All specimens showed concrete breakout failure. Test results show that inclined cracks initiated at both sides of ring at the level of anchor center in the specimens without anchor reinforcement. In the specimens with anchor reinforcement, the cracks started at the hooks of the anchor reinforcement and, therefore, the projected area of the failure surface was enlarged. Due to the large contact area between ring and concrete and the high-shear stiffness of the ring, maximum loads of all specimens developed before displacement of ring reached 2 mm. By placing anchor reinforcement, projected area of failure surface in direction perpendicular to anchor axis as well as edge distance ca1 were enlarged and the maximum loads increased by 64.3 and 127 % for h150 and h210 specimens, respectively. The average of the test-to-prediction ratios was 1.11 with a coefficient of variation of 13.2 %, when the predicted values were calculated using the existing equation with the measured concrete strength. In the test results, it was found that the concrete breakout strength of HRA can be safely predicted using the existing equation.
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