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Title |
Strength and Stiffness of Deep Deck Slabs (CAP Deck) under Positive Flexural Moment
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Authors |
최재우(Jae-Woo Choi) ; 경제환(Jae-Hwan Kyung) ; 김문길(Moon-Gil Kim) ; 전상현(Sang-Hyeon Jeon) ; 천성철(Sung-Chul Chun) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.5.465 |
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Keywords |
장선; 춤이 깊은 데크; 합성; 처짐 joist; deep deck; composite; deflection |
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Abstract |
Joist floors with deep deck plates do not need concrete formwork nor shoring support or minimum supports, which can reduce the construction period as well as improve construction safety. Typical 4-point loading flexural tests were conducted on composite joist floors with CAP II and CAP III to evaluate the flexural behavior of composite joist floors under positive moment. A total of eight specimens were tested: four composite joist floors and four reinforced concrete (RC) joist floors. The ratios of the measured maximum loads of the composite joist floors to the calculated loads, ignoring the effects of the steel deck plate, ranged from 1.60 to 3.34 indicating superior flexural strengths of the composite joist floors. Especially, the specimens with topping concrete of 110 mm and 120 mm depth had high maximum loads of 3.34 and 3.13 times calculated loads, respectively. The deflections at service loads of the composite joist floors were reduced due to the composite action of the steel deck plate and concrete. The deflections of the composite joist floors were only 0.48~0.75 times those of the RC joist floors with the same configuration. The average ratio of measured to calculated deflections at service loads, including the deep deck plate and reinforcing bar, was 1.04 implying that deflections at service loads can be properly estimated.
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