Análisis de la variación de ductilidad en columnas cuadrangulares de hormigón armado debido a su comportamiento biaxial usando el diagrama momento-curvatura

Abstract

This investigation is based in different models to get moment-curvature diagram of several RCC where the research raises to identify a model that allow to obtain adequate results about structural performance of this RCC sections. It is analyzed ductility variation that can be presented by adding nonlinear materials, biaxial behavior and axial load effects. In order to obtain this ductility variation, it was developed two different conditions wich consider deformation limits and damage controls for the materials. Not structural safety affectation is the first condition, and the second is severe damage state of structural elements. This performance conditions were evaluated for several discretization approaches of the cross section and the use of some constitutive materials existing in bibliography; including the ACI proposal, Mander et al. (1988) concrete confined model, and the research study of Zahn (1985). These idealizations were compared to each other, in order to determine different ductility magnitudes and their variations when is considered axial load and biaxial bending behavior.