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Title |
Evaluation of the Lap Splice Strengths of High Strength Headed Bars by Flexural Tests of RC Beams
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Authors |
이지형(Ji-Hyeong Lee) ; 장덕영(Duck-Young Jang) ; 김승훈(Seung-Hun Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.247 |
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Keywords |
겹침이음; 정착길이; 고강도철근; 확대머리철근; 유효춤 Lap splice; Development length; High strength bar; Headed bar; Effective depth |
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Abstract |
In this paper, a bending test was conducted on beams with two lap splice details when the effective depth of tensile high strength headedbars overlapped is the same and different. Through bending test, the lap splice performance of the high-strength headed bars was evaluated, and theapplicability of the KDS-2021 design formula was evaluated. In the LS specimens with lap splice details where the high strength bars had the sameeffective depth, all specimens with 1.3 times or more of the development length of the KDS-2021 equation and 1 times or more of the ACI318-19had the flexural failure mode after the ductile behavior to ensure sufficient lap splice performance. For specimens with details of lap joints betweenheaded bars with different effective depth, when lap splice length is calculated by the KDS-2021 formula, the flexural stress may be transmitted sothat the flexural strength at the cross section with the large effective depth and the cross section with the small effective depth becomes similar.
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