Abstract
Abstract This research work deals with the analysis of torsional tangent rigidity of reinforced concrete waffle slabs by comparisons of the numerical analysis with results of experimental tests, with calculations performed using the ATENA program. This program was specially developed for the calculation of reinforced concrete structures, considering the physical and geometric nonlinear analysis using the finite element method. Numerical analysis considered the tensile strength of the concrete and consequently the fracture energy. Numerical situations were tested to obtain the calibration of the numerical analysis with the laboratory tests. After the calibrations, the results were extrapolated to extreme situations to infer tangent torsion rigidity in new situations. It is concluded that, for waffle slabs, near the rupture, the torsional tangent rigidity should be 5% of the torsional tangent rigidity to the initial torsion. In service, considering one third of the total breaking load, the torsional tangent rigidity should be 85% of the torsional tangent rigidity to the initial twist. This great torsional tangent rigidity in service is another parameter that guarantees the structural efficiency of the waffle slabs and can be used in the most diverse applications of structural engineering.
Highlights
The waffle slab is a system that has lower costs, so it has become widely used
This research work deals with the analysis of torsional tangent rigidity of reinforced concrete waffle slabs by comparisons of the numerical analysis with results of experimental tests, with calculations performed using the ATENA program
In service, considering one third of the total breaking load, the torsional tangent rigidity should be 85% of the torsional tangent rigidity to the initial twist. This great torsional tangent rigidity in service is another parameter that guarantees the structural efficiency of the waffle slabs and can be used in the most diverse applications of structural engineering
Summary
The waffle slab is a system that has lower costs, so it has become widely used. Albuquerque [1] showed that for the region of São Paulo, the waffle reinforced concrete slab with propylene crates has a cost of 15.15% less than the solid slab of reinforced concrete, using both a traditional framework. The building presented differences of 103.54% in the moments and 47.5% in the top displacements, between the linear and non-linear geometric analysis In this calculation, the slab was considered as a rigid diaphragm and the rigidity was not computed. Araujo [12] considers that the waffle slabs, to have great torsional rigidity, must be calculated as solid slabs of equivalent thickness. Araújo himself [12], [13] presents good approximations that can be made, considering an equivalent thickness of massive slab These simplifications, whether considering a massive slab, which is more precise, or for the grid analogy, will always lead to approximate results that will require calibration
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