r7.01.01 Behavioral relationships BETON_GRANGER and BETON_GRANGER_V for clean concrete creep

Summary:

This document introduces the « Granger » clean creep model, which is a way to model the clean creep of concrete. It also details the writing and numerical processing of the model.

In Code_Aster, the model is divided into two laws of behavior: the complete version BETON_GRANGER_V and a simplified version, named BETON_GRANGER, without the effects of humidity and aging.

• 1. Introduction
• 2. Reminder on the creep behavior of a visco-elastic material
  • 2.1. Boltzmann principle of superposition
• 3. Presentation of the Granger clean creep model
  • 3.1. Experimental properties of the natural creep of concrete under uniaxial loading
  • 3.2. Modeling non-aging creep using a generalized Kelvin model
  • 3.3. Effect of aging
  • 3.4. Effect of humidity
  • 3.5. 3D modeling
• 4. Code_Aster behavior relationships
• 5. Digital integration of the model
  • 5.1. Discretization (1D)
  • 5.2. Integrating the behavioral relationship
  • 5.3. State variables
  • 5.4. Tangent matrix
• 6. Bibliography
• 7. Features and verification
• 8. Description of document versions