Title: Constitutive Model for Cracked Reinforced Concrete
Author(s): Vladimir Cervenka
Publication: Journal Proceedings
Appears on pages(s): 877-882
Keywords: compression; cracking (fracturing); finite element method; optimization; reinforced concrete; shear properties; stiffness; stresses; stress-strain relationships;structural analysis; tension.
The constitutive model used to calculate the winning solution that was submitted to the international competition to predict the behavior of four reinforced concrete panels tested at the University of Toronto is based on a smeared representation of cracking and reinforcement in plane stress state. The refined action of cracked concrete includes compressive resistance of concrete parallel to cracks, tension stiffening, and shear resistance of concrete on the crack face. A new basic assumption is that compressive strength and other material properties are reduced due to damage done to the concrete by cracking. The model is formulated so that the material stiffness matrix is directly applicable to nonlinear finite element analysis. The material functions are optimized with respect to the experimental data from Vecchio and Collins,’ which were used for the prediction competition. The parameter study shows the sensitivity of the resulting stress-strain relationship to the separate material parameters.