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Title |
Shear Performance and Residual Tensile Strength of High-Shear Ring Anchors for Steel Members Installed in Normal and Repaired Sections
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Authors |
전상현(Sang Hyeon Jeon) ; 김경록(Kyeong-Rok Kim) ; 천성철(Sung-Chul Chun) ; 김재열(Jae Yeol Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.1.039 |
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Keywords |
전단; 앵커; 고전단 링앵커; 보수단면; 잔존인장강도 shear; anchor; high-shear ring anchor; repaired section; residual tensile strength |
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Abstract |
Structural performance of High-Shear Ring Anchors (HRAs) for steel members is evaluated through shear and tensile tests. The HRAs were developed to join steel members and existing reinforced concrete structures. Test variables include concrete compressive strength, side cover thickness, embedment length of anchor rod, and surface repair. Similarly to normal HRAs, HRAs for steel members under shear with side cover thickness of 100 mm showed side-face blowout failure and HRAs for steel member with side cover thickness of 200 mm showed bearing failure. Shear strengths of HRAs for steel member are not proportional to embedment length of anchor rod. Therefore, an upper limit of embedment length of anchor rod can be set at 125 mm, the same as the upper limit of normal HRAs. Because eccentricity between the applied shear and resistance of HRAs for steel members is greater than that of normal HRAs, an average of test-to-prediction ratios is 0.96, where the predictions are calculated with equations developed from studies on normal HRAs. HRAs for steel member installed in repaired sections show lower load resisting capacities than normal HRAs with the average of test-to-prediction ratios of 0.86. The tensile strength of HRAs for steel member, after shear load was applied, can be safely evaluated by the minimum among the concrete breakout strength and bond strength with the actual embedment length of the rod.
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