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Title |
Experimental Study on Bond Behavior of Hollow Rebar to Concrete
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Authors |
문도영(Do Young Moon) ; 안동욱(Dong Wook Ahn) ; 이기홍(Gi-Hong Lee) ; 최세진(Se Jin Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.6.597 |
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Keywords |
중공철근; 인발실험; 힌지보 실험; 겹이음 실험 hollow rebar; pullout-test; hinged beam test; lap splice beam test |
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Abstract |
The bond between concrete and rebar is the most basic and important property to ensure composite action. In this study, the bond behavior between hollow rebars and concrete was evaluated using a pull-out test, a hinged beam test, and a lap splice beam test. The difference between the bond mechanism of ordinary deformed and hollow reinforcing bars was confirmed using the pull-out test. Since the relative rib area of hollow reinforcing bars is relatively smaller than that of deformed rebars, it was confirmed that the bond of hollow reinforcing bars is greatly affected by the friction between the ribs and the concrete and the shearing-off of the concrete key between the ribs. The results of the hinged beam test for 19 mm diameter reinforcing bars, were used to determine the basic development length required for concrete anchorage. It was found that a basic development length of 11 times the diameter of hollow reinforcing bars, and 15 times the diameter of ordinary deformed reinforcing bars, was required. In addition, the results of the lap splice beam test showed that when a lap splice equal to the development length specified in the KCI design code was required to achieve full bending behavior.
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