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Title |
Shear Strength Evaluation on Multiple High-Shear Ring Anchors Using Shear Strength Model of a Single High-Shear Ring Anchor
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Authors |
김문길(Mun-Gil Kim) ; 천성철(Sung-Chul Chun) ; 김영호(Young-Ho Kim) ; 심혜정(Hye-Jung Sim) ; 배민서(Min-Seo Bae) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.4.463 |
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Keywords |
anchor ; shear ; splitting failure ; bearing failure ; push test |
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Abstract |
A shear strength model for the high-shear ring anchor consisting of a steel ring and a rod was developed based on the shear tests on single high-shear ring anchors. The shear strength was found to be proportional to fck 0.75 which is a similar characteristic to the strength of shear connectors used in composite structures. The effects of the compressive strength of concrete, edge distance, and embedment length of rod are included in the proposed model. Comparison with 22 tests shows that the average and the coefficient of variation of test-to-prediction ratios are 1.01 and 7.57%, respectively. Push tests on the specimens having four high-shear ring anchors at each face were conducted and the measured shear strengths were compared with the predictions by the proposed model. For the specimen with an edge distance of 100 mm, a splitting failure occurred and for the specimens with an edge distance of 150 mm, a failure mode mixed with splitting and bearing occurred, which were very similar to the failures of shear tests on single high-shear ring anchors. In case of a splitting failure, the overlap of failure surfaces could be prevented by providing the longitudinal spacing of 400 mm which is four times of the edge distance. In case of a bearing failure, the failure area is less than 150 mm from the center of the anchor and therefore the overlap of failure surfaces could be prevented by providing the longitudinal spacing of 200 mm. The average of the test-to-prediction ratios of Push tests is 98%, which means that the proposed mode can be applied to predict the shear strength of the multiple high-shear rings.
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