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Title |
Experimental Study on a Web Shear Design Equation for Composite Precast Concrete Hollow Core Slabs
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Authors |
오영훈(Young-Hun Oh) ; 문정호(Jeong-Ho Moon) ; 윤여진(Yeo-Jin Yoon) ; 이진섭(Jin-Seop Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.5.509 |
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Keywords |
중공슬래브; 덧침 콘크리트; 전단보강근; 복부 전단강도; 설계기준 hollow core slab; topping concrete; shear reinforcement; web shear strength; design standard |
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Abstract |
This research aimed to examine the effects of topping concrete and shear reinforcements on the web shear strength of precast concrete (PC) hollow core slabs (HCSs). To this end, previous test data were reorganized so as to be suitable for use in this research. A total of 18 test specimens were grouped into two series according to HCS thickness (320 mm [T_320] and 400 mm [T_400]). Each series contained three types of specimens (G1-G3): G1 corresponded to PC HCS without topping concrete; G2 to composite the HCS without shear reinforcements; and G3 to composite the HCS with shear reinforcements. Test results showed that the G2 and G3 types exhibited a different failure mode compared with the assumption of design standards. Diagonal cracks in the composite HCS did not propagate to the topping concrete, but fracture failures that separated at the interface between the PC HCS and the topping concrete were evident. An analytical examination showed that it should be designed in consideration of the possibility of interface separation that may occur at the intersection between the PC HCS and the topping concrete. A particularly important conclusion was that additional reinforcements should be provided to prevent interface separation and diagonal shear failure in composite HCSs.
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