r7.01.08 MAZARS damage model

Summary:

This documentation presents the MAZARS behavior model that allows to describe the elastic-damaging behavior of concrete. This model is 3D, isotropic and is based on a damage criterion written in deformation and describing traction-compression asymmetry. The initial model does not account for the restoration of stiffness in the event of « reclosing cracks » and does not take into account the possible plastic deformations or viscous effects that may be observed during the deformations of a concrete. The version implemented in Code_Aster takes into account the latest improvements. This reformulation of the Mazars model from the 1980s makes it possible to better describe the behavior of concrete under bi-compression and in pure shear.

Version \(\mathrm{1D}\) of the model makes it possible to report on the restoration of stiffness in the event of cracks being closed; it is only used with multifibre beams [R5.03.09].

• 1. Introduction
  • 1.1. An elasto-damageable law of behavior
  • 1.2. Regularization limits and methods
  • 1.3. Coupling with thermal
  • 1.4. Mazars law in the presence of a drying or hydration field
• 2. The MAZARS models
  • 2.1. Original Mazars Model
  • 2.2. Mazars Revisited Model
• 3. Identification
• 4. Digital resolution
  • 4.1. Evaluation of the internal variable Y
  • 4.2. Assessment of damage
  • 4.3. Stress calculation
  • 4.4. Calculation of the tangent matrix
  • 4.5. Stored internal variables
• 5. Features and verification
• 6. Bibliography
• 7. Document version history