v7.22.137 FORMA41 - Practical work from the « Civil Engineering » training: taking into account withdrawals in the study of a 3-point flexure beam

Summary:

This test \(\mathrm{3D}\) illustrates on a simple case the questions relating to the modeling of shrinkages in concrete; it highlights the effect of drying and temperature on the distribution of stresses.

It is a reinforced concrete beam subjected to 3-point bending to which thermal and drying stress is added.

The objective of the test is to show the possibilities of modeling withdrawals by chaining thermal THER_NON_LINE and mechanical MECA_STATIQUE calculations.

Modeling A corresponds to the calculation of flexure in elasticity. It is used as a comparison for the other models.

Modeling B corresponds to the calculation taking into account desiccation shrinkage, endogenous shrinkage and thermal expansion.

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Initial condition and thermal loads
  • 1.3. Initial condition and drying loads
  • 1.4. Boundary conditions and mechanical loads
  • 1.5. Thermal properties of materials
  • 1.6. Properties of drying materials
  • 1.7. Mechanical properties of materials
• 2. Benchmark solution
  • 2.1. Elastic solution without shrinkage
  • 2.2. Solution with withdrawals
• 3. Modeling A
  • 3.1. Characteristics of modeling
  • 3.2. Characteristics of the mesh
  • 3.3. Tested sizes and results
• 4. B modeling
  • 4.1. Characteristics of modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested sizes and results
• 5. TP implementation
  • 5.1. Objectives of the TP
  • 5.2. Geometry and meshing
  • 5.3. First step: elastic calculation
  • 5.4. Second step: adding the thermohydration calculation and taking into account the dehydration withdrawal
  • 5.5. Third step: adding the drying calculation and taking account of withdrawals
  • 5.6. Analysis of the results
• 6. Summary of results