In the elements library you must have a bond element of zero thickness to model interaction between concrete and steel. When the rcc structures are modeled in FEM as layered model the same can be used to simulate the behavior of different materials in RCC.
Maybe you find this publication helpful:
Lettow, S., Eligehausen, R., Ožbolt, J. (2004): The simulation of bond between concrete and reinforcement in nonlinear threedimensional finite element analysis. Proceedings of the 5th fib International PhD Symposium in Civil Engineering, Stuttgart
There are various ways to do it. It depends on what kind of model are you using? For analytical modeling or modeling the bond within the framework of concentrated plasticity, fib MC2010 model is very well-suited for modeling the mean bond stress-slip relationship. However, if you are using finite element modeling framework, the modeing of bond depends on how you model the reinforcement. If you model the reinforcement as bar 2-node uniaxial elements, zero length bond springs are typically used to model bond behavior. If you model the reinforcement as solid, modeling of bond requires finite elements to transfer compression and shear. Sometimes, it may be needed to model the reinforcement itself with the ribs in finite element modeling. So you need to first decide the framework of your general modeling and then you can decide on the most suitable way to model bond between reinforcement and concrete.
An efficient (and mechanical based) approach to include the bond properties in a smeared cracked approach is to used the Cracked Membrane Model. Maybe the following paper is useful:
Article Strength and Deformations of Structural Concrete Subjected t...
In Abaqus Software you can define the embedded region between concrete and rebar.
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