Numerical Study of Crack Formation and Strains Distribution During the Punching of Reinforced Concrete Slabs

Abstract

AbstractThe article presents the results of finite element modeling for the nodes of connection of reinforced concrete floor slabs with columns of different cross sections. Finite element modeling was performed at the Simulia Abaqus for nonlinear formulation using a nonlinear diagram of concrete deformation with a descending branch. The reinforcement of the plate and column was modeled. The variable parameter was the shape of the column cross section. According to the results of a numerical experiment, schemes of cracking on the tension face of the slab, deformation of concrete and reinforcement in the punching shear zone, and the magnitude of failure loads were obtained. In the numerical study, the concentration of deformations in the plate near the corners of the column and their fall along the long side of the rectangular column was noted, which indicates an uneven distribution of internal forces along the length of the control perimeter. The same character of deformation is noted in the results of experiments on test samples. The results of finite element modeling are compared with the results of testing samples, which are prototypes of finite element models. A good convergence of the qualitative and quantitative deformation patterns of full-scale samples and finite element models is noted. Comparison of the results of finite element modeling and a full-scale experiment on prototypes is a verification of the design model and allows us to use the model to study other design parameters that affect the strength of a reinforced concrete slab during punching.KeywordsFinite element modelNon-girder floorFlat plateRectangular columnPunchingStrain