Abstract
This work presents a numerical model to simulate the failure behavior of slender reinforced concrete columns subjected to eccentric compression loads. Due to the significant influence of the lateral displacements on the loading state provided by an eccentric load, geometric nonlinearity is considered. The responses of the concrete in tension and compression are described by two scalar damage variables that reduce, respectively, the positive and negative effective stress tensors, which lead to two different damage surfaces that control the dimension of the elastic domain. To describe the behavior of the reinforcements, truss finite elements with elastoplastic material model are employed. Interaction between the steel bars and concrete is modeled through the use of interface finite elements with high aspect ratio and a damage model designed to describe the bond-slip behavior. The results showed that the numerical model is able to represent the nonlinear behavior of slender concrete columns with good accuracy, taking into account: formation of cracks steel yielding crushing of the concrete in the compressive region and interaction between rebars and concrete.
Highlights
Due to the important role played by reinforced concrete (RC) columns as structural elements, there are a number of papers available in the literature investigating their behavior
Rodrigues et al / Failure behavior modeling of slender reinforced concrete columns subjected to eccentric load
In the methodology applied in this work for modeling reinforced concrete columns, the interface steel-concrete is discretized using interface finite elements (IFEs), as proposed by Manzoli et al (2012)
Summary
Due to the important role played by reinforced concrete (RC) columns as structural elements, there are a number of papers available in the literature investigating their behavior. Seeking to contribute for a better understanding of the failure mechanisms of RC columns, a numerical model composed by some features which may be implemented in an existent finite element code is proposed. These features are made up by material models based on the Continuum Damage Mechanics Theory (CDMT) to represent the concrete and steel-concrete interface and an elastic-perfectly plastic model to simulate the steel reinforcement behavior.
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