A numerical model capable of accurately simulating the punching shear behavior of a reinforced concrete slab

Abstract

The paper presents the tridimensional numeric model of an inner slab‐column connection of reinforced concrete, which was previously tested against the punching shear in the lab of the University of Brasília. The numerical analysis has been carried out by the finite element method, using the software ABAQUS. To evaluate the sensitivity of the main factors that influence the responses of the model, a parametric investigation was conducted as per the finite element mesh, mechanical properties of the concrete and plastic parameters of the assumed model for the concrete, named by concrete damaged plasticity model (CDPM). The results of the resistance capacity, displacements, strains, cracking pattern, and failure mode were compared with those obtained experimentally. From this comparison, it was concluded that the numerical model was able to reproduce the punching shear phenomenon with a high level of precision.

NLFEA of one-way slabs in transition between shear and punching: Recommendations for modeling

“…The viscosity parameter value chosen was 0.00001 in such a way as to decrease the sensitivity of the results to the viscoplastic regularization in ABAQUS/Standard (implicit integration). However, in the literature, the values applied to vary significantly: between 0.00001 and 0.05, for instance [14,17,[55][56][57]. In practice, a viscosity parameter is a numerical tool used in the CDP model to improve convergence and eventually increase the speed of the simulation through the damping of the crack propagation through the numerical models.…”

“…(ii) The methodology used in several recent publications with numerical studies also needs to be discussed. For instance, during the validation step of the numerical models, it is frequent to use only one test result with a specific failure mechanism for validating the modeling strategy [17]. However, other failure mechanisms could appear when performing parametric analyses with significant changes in material and geometry parameters.…”

Nonlinear analysis of the impact of openings on punching shear strength

“…Many researchers in Brazil and abroad have studied the influence of openings close to columns in reinforced concrete flat slabs. [3][4][5][6][7][8][9][10][11][12][13][14] Although the structural system of flat slabs is widely applied in structural projects, the models proposed by the codes and normative prescriptions have limited experimental observations. 8 The current design codes for punching shear account for the effect of openings on the slab's ultimate capacity based on size and location, by reducing the critical/control perimeter.…”

“…Additionally, it induces greater shear stresses, and the openings make it difficult for the flexural and shear reinforcement to be placed more efficiently. Many researchers in Brazil and abroad have studied the influence of openings close to columns in reinforced concrete flat slabs 3–14 …”

Accuracy and stability of a finite difference scheme for two-dimensional problems of soil dynamics

“…When solving systems of differential equations with initial and boundary conditions (dynamic problems), various methods can be used [11][12][13][14][15]. The most common and widely used among them are the finite difference method and the finite element method [12][13][14][15][16].…”