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Title |
Study on the Extension of Reinforced Concrete Slabs
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Authors |
김진평 ; 김상식 ; 최광호 ; 전병갑 ; 이정윤 |
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Keywords |
리모델링; 철근콘크리트 바닥판; 강절점; 정착길이; 평면확장; remodeling, reinforced concrete slabs; rigid connection; development length; extension of residence area |
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Abstract |
In order to remodel old aged reinforced concrete buildings, it is often required to extend the residence area of the buildings by increasing the slab area. The slab area is usually extended by attaching a new slab to the existing slab with hinged joint or rigid joint. Transmission of the loads of the attached slabs to the existing slabs depends on the connecting methods, such as hinged or rigid connection. In this research, 8 specimens and 24 RC slabs connected by rigid joints were tested. The new slab was connected to the existing slab by three types of rigid joints using dowel bars and longitudinal tensile bars. Main parameters of the slabs were three types of the rigid joints, anchor length of steel bars(0, 50, 60, 100, and 120mm), development length of steel bars(100, 200, and 300mm), and the spacing of the steel bars(150, 200, 300, and 450mm). The test results indicated that the flexural strength of the RC test slabs having various types of rigid joints was approximately the same to that of the slab without any connections.
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