Finite Difference Energy Method for nonlinear numerical analysis of reinforced concrete slab using simplified isotropic damage model

Abstract

This work presents a model to predict the flexural behavior of reinforced concrete slabs, combining the Mazars damage model for simulation of the loss of stiffness of the concrete during the cracking process and the Classical Theory of Laminates, to govern the bending of the structural element. A variational formulation based on the principle of virtual work was developed for the model, and then treated numerically according to the Finite Difference Energy Method, with the end result a program developed in Fortran. To validate the model thus proposed have been simulated with the program, some cases of slabs in flexure in the literature. The evaluation of the results obtained in this study demonstrated the capability of the model, in view of the good predictability of the behavior of slabs in flexure, sweeping the path of equilibrium to the rupture of the structural element. Besides the satisfactory prediction of the behavior observed as positive aspects of the model to its relative simplicity and reduced number of experimental parameters necessary for modeling.

Numerical analysis of torsional tangent rigidity of reinforced concrete waffle slab

“…This model maintains all the plate compatibilities developed by the cover and also computes the bends and the twists of the cover and the ribs. Other researchers have adopted more advanced models to consider concrete cracking as can be seen in Lima et al [15]. One can even adopt the non-perfect adhesion between steel and concrete, as done by Tavares et al [16] in the numerical simulation of pullout tests.…”