الفهرس 
Flexural behavior of 3d sandwich composite panels
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Abstract
3D Sandwich Composite Panel (3DSCP) system is well known and widely utilized in many countries all over the world. 3DSCP consists of two concrete layers reinforced with steel wire meshes. Concrete layers are separated by Expanded Polystyrene Foam layer. Diagonal steel shear connectors are used to achieve a composite action between both concrete layers.
Most of the research regarding the 3DSCP behavior is experimental oriented work. Analytical oriented research is minor. Experimental work is occasionally associated with numerical simulation. Experimental work on mockup buildings considering interaction among different elements of the building is rarely found. Researchers mainly test standard panels like those commercially produced panels to reflect reality. Others tested samples with different details like using orthogonal shear connectors, using double reversed shear connectors, using corrugated foam layer, using FRP reinforcement, and samples reinforced with additional rebar in tension concrete layer.
Analysis of 3DSCP subjected to flexure is carried out using Finite Element Analysis (FEA). Analysis models are performed using Finite Element based software ABAQUS. Analysis Model parts, input data and results are described. For the sake of model’s validation, Results of the analysis model is compared to published experimental test results. Effect of shear connectors on behavior of 3DSCP is studied. The analysis program consists of two series of 3DSCP samples with different Slenderness ratios. Volumetric ratio of shear connectors is increased by two alternatives. In first series, shear connectors diameter is increased. While in second series, spacing among shear connectors is reduced. Improvement in 3DSCP composite action is analyzed via strain distribution across the panel’s thickness. Other enhancements in 3DSCP behavior like load bearing capacity and deflection are investigated. Recommendation regarding effective method to increase 3DSCP load capacity is proposed.
A simplified analysis method of 3DSCP subjected to flexure is studied. This method aims to model 3DSCP by any structural software using shell element. Several 3DSCP with different Slenderness ratios are investigated using ABAQUS. Behavior of solid concrete slabs that has thickness equals to sum of both concrete layers and the same length of 3DSCP are studied using ABAQUS. Deflections at the same load for both 3DSCP and the corresponding solid panel are obtained. At the same load and having the same length, Deflection ratio is considered stiffness ratio that correlates behavior of both samples. Shell element has the thickness of the solid section. Stiffness ratio is proposed to be used as stiffness modifier for the shell element to yield the same behavior of 3D sandwich composite panel. Value for stiffness modifier is propose