Experimental and Numerical Modeling Investigation of Concrete Sandwich Slab With and Without Concrete Ribs

Abstract

Experimentally and numerically investigation of a prototype cast-in-place concrete sandwich panel (CCSP), which has been subjected to a four-point bending load for a variety of concrete compressive strength values, truss shear connector types, and insulation layer thicknesses, has been carried out to study the structural behavior of concrete sandwich slabs, which are composed of two thin reinforced concrete layers (wythes) isolated by a thermal core layer and tied by steel truss shear connectors embedded in concrete ribs. The setting for the tests, as well as the methodologies, has been thoroughly demonstrated. The load-central deflection response, crack patterns, and failure modes have been all considered when analyzing the specimens. The FE model has been created and validated by using the experimental results. The tests’ results reveal that all the specimens behave as composite members until they break down and that their performance under flexural Load is comparable to that of common reinforced concrete one-way slabs. The type of steel truss shear connector embedded in the concrete ribs greatly affects the flexural behavior of the specimens under test. When the insulation thickness is increased in tandem with the concrete ribs, the ultimate flexural load capacity of the specimens is enhanced by 22 %. Furthermore, when the concrete compressive strength improves between 5.0 percent and 9.0 percent, the maximum flexural capacity increases by the same percentage. All of the specimens have failed in the flexural mode, and the load-central deflection response of the composite slabs is trilinear.
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