Abstract
Abstract Ribbed slabs have been widely used in buildings due to their many advantages, especially the decrease of concrete below the neutral line. This paper presents an experimental and computational study on ribbed slabs with wide-beam, two one-way slabs and two two-way slabs, with variable depths were tested to evaluate their resistance to punching and shear strength of slabs. Experimental and computational results showed that the wide-beam ribs connection is a critical point in the design of the slabs due to the difference in stiffness in the transition zone. Best results for the ultimate load estimates for ribs were provided by EC 2 (2004), while estimates of ACI 318 (2008) and NBR 6118 (2014) were respectively conservative and unsafe. Test results on slabs also revealed that the Brazilian alternative to analysis ribbed slabs as solid ones failed to give satisfactory results.
Highlights
One of the most important decisions in the building design process is the type of slab used
This paper presents an experimental and computational study on ribbed slabs with wide-beam, two one-way slabs and two two-way slabs, with variable depths were tested to evaluate their resistance to punching and shear strength of slabs
In relation to displacements of the two-way slabs, it was noted that the slab with the wide-beam of smaller depth, in this case slab L3, showed higher displacements when compared to slab L4, featuring a wide-beam 50 mm higher than L3
Summary
One of the most important decisions in the building design process is the type of slab used. According to Schwetz [1], the volume of concrete in solid slabs may comprise up to two-thirds of the structures total volume In this context, ribbed slabs represent a good option since, according to Macgregor [2], the relationship between the distribution of shear stress, bending moment and length of the slab span is an important parameter to determine the type of slab. It is necessary to increase the widebeam height to avoid excessive displacements in span, to avoid checking the punching shear and combat high bending moments in the slab-column connection. A failure may occur in some cases by punching shear in wide-beam-column connection It would be a design delimiter for ribbed slabs since these wide-beams are only dimensioned to resist the bending moment and beam shear
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