4. B modeling

4.1. Workflow of the TP

The aim is to carry out the calculation using only structural elements, namely elements DKT for concrete and elements GRILLE_EXCENTREE for reinforcements, by generating the Code_Aster command file using AsterStudy*.*

4.2. Realization of the mesh

Create the concrete mesh using Salomé. Duplicate the meshes to be able to represent the 2 reinforcement layers.

4.3. Elastic calculation

In the command file or in AsterStudy, the various commands necessary to carry out this study will be defined. The various steps are shown below.

Read the mesh in MED (LIRE_MAILLAGE) format.

Assign models to different mesh groups (AFFE_MODELE/DKT and GRILLE_EXCENTREE).

Define the characteristics of structural elements (AFFE_CARA_ELEM, keyword COQUEpour the concrete modelled by DKT, keyword GRILLEpour the elements GRILLE_EXCENTREE).

Define the material properties of steel and concrete (DEFI_MATERIAU/ELASpuis AFFE_MATERIAU).

Affect boundary conditions and loads (AFFE_CHAR_MECA, keywords DDL_IMPOet PESANTEUR).

Create time discretization using DEFI_LIST_REEL.

Use STAT_NON_LINEpour the elastic calculation (COMPORTEMENT/RELATION =” ELAS “) with the instant list defined earlier.

Print the result in MED format (IMPR_RESU/FORMAT =” MED “).

Start the calculation.

4.4. Post-treatment

Post-process the desired information, as in case \(3D\).

4.5. Tested sizes and results

Value of stress components:

Location	Identification	Reference	Tolerance
Edge \(B1X\)	Resulting effort \(DZ\)	\(\mathrm{2,95443}\times {10}^{5}\)	:math:`mathrm{0,001}`%
	Maximum stress in the steel sheet \(ACM\)	\(\mathrm{2,88427}\times {10}^{6}\)	:math:`mathrm{0,001}`%
	Maximum stress in concrete	\(\mathrm{2,44314}\times {10}^{7}\)	:math:`mathrm{0,001}`%

Note: it is also possible to carry out this study by meshing the reinforcements explicitly. In this case, the reinforcement mesh must use the same nodes as the concrete.