Study of the Stress-Strain State of Short Hollow Core Slabs Depending on the Width

Abstract

AbstractThe paper dwells on a numerical investigation of short hollow slabs of different width. The length of all specimens was 2400 mm. The calculations were performed analytically according to current technical documents, as well as by the ANSYS software package. In the software, loading was carried out subsequently with a stridden load application. Modern software packages are appropriate to use to study the stress-strain behavior of such constructions, using modern models and yield criteria based on incremental-iterative algorithms and general concepts of building mechanics, when solving physically nonlinear problems. The calculation data for the analytical approach are compared with the computational calculation based on the available Drucker–Prager yield criterion. The load-deflection curves for successive loading of specimens of different width are constructed on the basis of this model. The comparison of analytical and computational results of calculations was performed for the ultimate breaking load, maximum deflections, cracked condition, and in reinforcement stress at failure. It was found out the way in which the width of hollow slabs affects the value of the rupturing load for each square meter of the floor structure with a fixed reinforcement coefficient. What is more, it is shown that the specimens with a larger cross-section width and a larger number of voids had an ultimate load-bearing capacity. The stress-strain state in concrete was appreciated in the centre section of samples at various loading stages.KeywordsStress-strain stateBilinear kinematic hardeningDrucker-Prager modelBearing capacityDeflection