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Title |
Experimental Studies and Detailing Suggestion for Reinforced Concrete Slabs with Steps
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Authors |
김상희 ; 홍건호 ; 박홍근 ; 한규범 ; 강현구 |
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DOI |
https://doi.org/10.4334/JKCI.2013.25.4.447 |
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Keywords |
슬래브 ; 단차슬래브 ; 휨강도 ; 보강근 ; 사인장 균열 slab ; slab with step ; bending strength ; additional reinforcement ; diagonal tensile splitting |
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Abstract |
In this study, reinforced concrete slabs with steps were experimentally studied to analyze their structural performance and to suggest reinforcing details in the step. Because the stepped slabs may behave very poorly in terms of bending strength, stiffness, deflection, cracking, etc., the study is aimed to suggest proper reinforcing details such that the same bending strength is obtained as that without steps. The bending strengths of 12 test specimens with a variety of different reinforcing detail types or other parameters were compared with each other. The specimen without any additional reinforcement in the step had a very low bending strength and significant damage, and the specimens with diagonal reinforcements in the step showed substantial early cracks, experienced hinging of the step, and had a substantial loss of the bending strength. In contrast, the specimens with a combination of U-bars, reversed U-bars, L-bars, and reversed L-bars performed very well and almost reached to 100% of the slab bending strength. The U-bars and reversed U-bars were effective in controling the diagonal cracks, while the L-bars and reversed L-bars were effective in preventing from yielding of slab reinforcement near the step.
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