r7.01.21 Behavioral law (in 2D) for the steel-concrete bond: JOINT_BA

Summary:

The law of behavior JOINT_BA describes the phenomenon of degradation and rupture of the connection between steel bars and concrete, in reinforced concrete structures. This documentation presents theoretical writing in the thermodynamic framework and the numerical integration of the law, as well as the parameters that manage the model.

For its use, we will rely on finite elements of the joint type (see document [R3.06.09]) already existing in the code.

• 1. Introduction
• 2. Brief description of the steel-concrete bond
• 3. Theoretical writing
  • 3.1. Presentation of the model
  • 3.2. Analysis of damage in the tangential direction
  • 3.3. Analysis of damage in the normal direction
  • 3.4. Analysis of the contribution of sliding crack friction
  • 3.5. Summary of equations
  • 3.6. Tangent matrix expression
• 4. Digital integration
  • 4.1. Calculation of the « crack friction » part with an implicit integration method
  • 4.2. The resolution algorithm
  • 4.3. Internal variables of the model
• 5. Parameters of the law
  • 5.1. The initial settings
  • 5.2. The damage parameters
  • 5.3. The damage parameters on the normal direction
  • 5.4. The parameters of friction
  • 5.5. Parameter summary
• 6. Bibliography
• 7. Verification
• 8. Description of document versions