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Title |
Evaluation of the Bending Performance of a Modified Steel Grid Composite Deck Joint
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Keywords |
격자형 강합성 바닥판 ; 바닥판 이음부 ; 콘크리트 전단키 ; 고장력볼트 ; 모멘트-곡률 관계 Steel grid composite deck ; Deck joint ; Concrete shear key ; High-tension bolt ; Moment-curvature relationship |
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Abstract |
For the joint connection of the precast steel grid composite decks, the prefabricated joint which is composed of concrete shear key and high-tension bolts was already proposed. In this study, for the purpose of increasing the bending stiffness and bending strength of the proposed prefabricated joint section details of the proposed joint are modified, and through experimental tests the bending performance, such as stiffness and strength of a modified joint, is compared with those of the proposed joint. Test and analysis results show that the shear cracks in the concrete shear key are clearly reduced by the strengthening of the shear key using shear studs and additional rebars. According to analysis results of the moment-curvature relationship, bending stiffness of the modified joint is about 47% greater than the stiffness of the proposed joint. Furthermore, the modified joint has about 32% greater bending strength than the proposed joint. Compared to specimens without the joint the modified joint has same or slightly higher bending strength, but about 37% lower bending stiffness.
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