Abstract
As a FEM for reinforced concrete bond-slip problems, one important feature of the typical double spring joint element method is the selection of the normal stiffness, which may cause the mutual embedding problem and bring challenges to the calculation. In this paper, a novel single spring joint element method based on the mixed coordinate system is proposed to simulate the interaction of two materials. Instead of choosing the normal stiffness arbitrarily, the proposed method makes DOFs of two materials in the normal direction equal to ensure deformation compatibility. And its solid elements for the concrete are solved in global coordinate system, while the beam elements for the steel bar are solved in local coordinate system. In addition, the proposed method can also be applied to RC structures with irregular arrangements of steel bars. Numerical examples demonstrate the validity and accuracy of the proposed approach. Furthermore, the bond model is applied to RC beams with the description of the damage process.
Highlights
Reinforced concrete (RC) structures are widely used for engineering and construction purposes
The results demonstrate the ability of the isotropic damage model to describe the bending of reinforcement concrete in multiaxial stress state and the advantages of the proposed model over the typical double spring joint element method (DSEM)
A novel single spring joint element method based on mixed coordinate system for bond-slip problems in RC structures has been proposed
Summary
Reinforced concrete (RC) structures are widely used for engineering and construction purposes. Ismail et al [17] studied the mechanical behavior of unidirectional fibre-reinforced polymer composites subjected to transverse tension using a two-dimensional discrete element method (DEM) This method, unlike the conventional FEM, is convenient to deal with local behavior of a material by defining local models or parameters for the specified particles and contacts. It is worth noting that the single spring is set along the tangent direction of the reinforcing bar to simulate the tangential interaction between two materials with its tangential stiffness determined by the relationship of the bond force and slip, while, in the normal direction, DOFs between two nodes are forced to be equal to ensure the deformation compatibility of two materials. The proposed single spring joint method is applied to analyze isotropic damage of reinforced concrete with slender beams
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