B modeling
====


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*.*


Realization of the mesh
----

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


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.


.. csv-table::

    "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."



Post-treatment
----

Post-process the desired information, as in case :math:`3D`.


Tested sizes and results
----

Value of stress components:


.. csv-table::

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