The Experimental Study On Rigidity Of Concrete Composite Two-way Slabs With Steel Bar Truss

The steel structure system possesses excellent load capacity and seismic behavior.With the features of environmental protection and recycling,it can realize industrialization so as to make it possible to accelerate construction.The steel structure system plays a significant role in the development of modern architecture.As a main part of the steel structure construction,the floor system is vital for development and research of the system.The cast-in-place reinforced concrete floor,the profiled steel sheet and concrete composite floor and the reinforced concrete superimposed floor slabs are the most wide-spread floor systems used in the steel structure construction.The development direction of the floor system tends to light-weight,high-strength,standard production and rapid construction.The truss-type composite floor slab system researched in this paper is a new type one deriving under demand of the development direction,which satisfies the requires of the steel structure construction.Inthe construction stage,the truss-type composite floor slab undertakes the weight of concrete and live load withoutformwork constructing and stripping.In the normal usage stage,after concrete reach the design standard,it will integrate with thetruss-type composite floor slab to undertake floor load,which comes with the features of light-weight and high-strength.Based on themethodof equivalent moment of inertia of an area,the paper theoretically analyses the sectional flexural stiffness combining with the features of the truss-type composite floor,and works out the calculating formula of the sectional flexural stiffness in the construction and normal usage stages.In addition,using the FEM software,ABAQUS,simulation contrast the steel bar truss concrete two-way slab and deflection in six groups affected by different factors,the paper concludes that the top and bottom chord of truss,the depth of truss and profiled steel sheet have a relative influence on the steel bar truss concrete two-way slab.The paper works out the calculating formula of the steel bar truss concrete two-way slab with comparison of deflection data from the numerical simulation and theoretical calculation data.Providing references for the follow-up study of steel truss composite floor slab,the paper has certain practical engineering significances.