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Title |
Evaluation on Shear Behaviors of the Dapped Ends of Domestic Composite Double Tee Slabs under the Short-Term Loading
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Keywords |
전단; 더블티; 댑단부; 걸이철근; 프리스트레스트; 프리캐스트; 콘크리트; shear; double tee; dapped end; hanger reinforcement; prestressed; precast; Concrete |
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Abstract |
Shear behaviors of eight dapped ends of four full-scale domestic single-tee slabs were evaluated. The dapped ends with 10cm topping concrete were designed based on live load requirements for the domestic parking lot of m 500kgf/㎡ and for the large market of 1,200 kgf/㎡. All specimens were designed by the ACI 318-99 design. The variations of the experiment were the shape of hanger reinforcements as followings: 1) general PCI design method(currently used in domestic), 2) 90 degree bent-up, 3) 60 degree bent-up. All experiments were conducted with 1.2 m shear span. The results obtained in this study were 1) all specimens fully complied with the shear strength requirements as specified by ACI 318-99 except for one strand bond slip specimen, 2)a specimen with the 60 degree bent up hanger reinforcing detail showed the best shear behaviors under full service and ultimate load, and 3)a specimen with the 90 degree bent up hanger reinforcing detail resulted in the worst shear behaviors.
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