| Closed-section steel deck-concrete composite slabs due to superior structure form are widely used today. The two webs of its rib stick tightly each other and the top flange girth distribute as triangle,which can reinforce stability for the webs and the flange girth,and increase rigidity and bearing capacity of steel plate, it has much good characteristic from any other aspect,such as the building external appearance,construction and mechanical property and so on.Through test, the bearing capacity of the composite slabs have been studied.The YJ66-720 Closed-section steel plates are provided by Central Research Institute of Building and Construction, MCC,Group.At the same time,it will determine coefficient in the formula of shear resistance by studing the shear performance between steel deck and concrete.Under two types of shear span, effects on the ultimate bearing capacity by various factors such as thickness of concrete, thickness of steel plate, peg, hoop reinforcement, load-strain relation and load-deflection relation on various place of steel plate was investigated. Experimental results show that thickness of steel plate has effect, and the necessary peg can improve combination function to enhance ultimate load. In addition, setting up some hoop reinforcement can enhance cracking load in order to improve ultimate load. In conclusion, m, k coefficient was obtained through regression analysis and a horizontal shear-bondformula was recommend to consult.using general purpose finite element program-ANSYS the test slabs was analyses,and regularity of distribution of deformation was obtained when the combinationg slabs suffer force,through making a nonliner finite-element analysis. Finally, analysis results and experiment results were compared,and can bereferenced for later computer simulative analysis of this type of structure.
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