Abstract
Numerical modelling of bond is a challenging due to a number of physical and mechanical phenomena arising from interaction of ribbed reinforcing bars and concrete. In present paper 2D and 3D approaches for bond analysis are compared in terms of global load-displacement behaviour of RC element, formation of microcracks and deterioration of concrete in front of the ribs. Nonlinear Finite element software ATENA was used for both 2D and 3D analysis. It was shown that differences between two approaches are minor and simpler 2D models may be used for the analysis of bond in RC structures.
Highlights
Reinforced concrete (RC) is a composite material comprising relatively brittle concrete and reinforcing bars which carries majority of tensile stresses
The results are presented at three representative load levels: σs = 37, 122 and 489 MPa, where σs is the stress in steel reinforcement
Damage of concrete and debonding of the reinforcement starts at the loaded end, confirming the theory of damage zone in RC elements (Ruiz et al 2007)
Summary
Reinforced concrete (RC) is a composite material comprising relatively brittle concrete and reinforcing bars which carries majority of tensile stresses. Due to simplified representation of stress distribution (average concrete stresses in the section are assumed) it is impossible to model formation of secondary and splitting cracks, damage of concrete in front of the ribs, diffusion of tensile stresses from reinforcement to concrete.
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