Abstract
The ribbed slabs provide a lighter and stiffer slab than an equivalent traditional slab with minimizing the total volume of the materials. Four one-way lightweight concrete panels, including one flat and three ribbed panels were cast and tested under two-point load as simply supported up to the failure. The main investigated variable is a ratio of the rib depth (d) to the overall beam depth (h). All the panels have the same concrete volume and the same steel reinforcement ratio. Also, the width of the rib is equal to the slab thickness as a constraint condition in all the panels. Data were recorded at the loading stages to determine the load capacity and the deflection. A nonlinear finite element analysis carried out by using ANSYS-15 software program to analyze the panels and to verify the results. Increase the (d/h) ratio improved the structural behavior by increase the carrying load capacity and reduces the deflection to a certain limit. Compatibility results have been obtained between the numerical and experimental work.
Highlights
In civil engineering construction, the objective of using or selecting any material is to make full use of its properties in order to get the best performance for the formed structure
The one way ribbed floor systems consist of a series of parallel reinforced concrete tee beams framing into reinforced concrete girders with a whole depth greater than the solid slab depth
The results showed that the significant contribution for the flange is in resisting the shearing stresses
Summary
The objective of using or selecting any material is to make full use of its properties in order to get the best performance for the formed structure. The test plan was designed to inspect the effect of the depth and the spacing of the ribs on the strength and flexural rigidity of the waffle slabs. Two solid slabs were included; the first has the same total slab depth as in the first group to study the torsional and flexural influences, and the second to investigate the equivalent thickness assumption. The reduction in self-weight was about 16% by increasing 20% in the ultimate failure load by increasing the depth of the ribs in the waffle slab system [3]. The first is that the rib width is equal to the slab thickness and the second is that the concrete cross-section and the steel reinforcement areas are the same in the flat and the ribbed panels
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