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Title |
An Experimental Study for Bond Characteristics of Deformed Bar Embedded in Donut Type Biaxial Hollow Slab
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Authors |
정주홍 ; 강성훈 ; 이승창 ; 최창식 ; 최현기 |
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DOI |
https://doi.org/10.4334/JKCI.2013.25.2.155 |
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Keywords |
도넛형 이방향 중공 슬래브 ; 내부피복두께 ; 부착응력-슬립 관계 ; 부착응력 분포 donut type biaxial hollow slab ; inner cover thickness ; bond stress-slip relationship ; bond stress distribution |
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Abstract |
This study investigated the bond characteristics of embedded deformed steel bar in donut type biaxial hollow slabs. The donut type hollow sphere make concrete inner cover formed between steel bar and hollow sphere due to the hollow shape and arrangement. Generally, inner cover was thinner than outer cover, and some part of donut type biaxial hollow slab has smaller inner cover thickness than 2.5 db. It was affected to the bond condition of deformed bar. Furthermore, inner cover thickness changes along the longitudinal deformed bar due to hollow shape. Therefore, donut type hollow slab was divided 3 regions according to the hollow shape such as insufficient region, transition region, sufficient region. Pull-out test were performed to find out the effect of bond condition by the region. Main parameters are inner cover thickness, embedded length and bond location. Bond characteristics of donut type biaxial hollow slab were confirmed through comparison of bond stress-slip relationship, maximum bond strength and bond stress distribution of each regions. And the calculation method of bond strength of donut type biaxial hollow slab was suggested based on the test results.
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