C modeling
==============


Characteristics of modeling
-----------------------------------


.. image:: images/Object_8.png
    :width: 4.6091in
    :height: 3.2173in


.. _RefSchema_Object_8.png:


Characteristics of the mesh
----------------------------

Number of knots: 11

Number of meshes and type: 10 SEG2


Tested sizes and results
------------------------------


Tested values
~~~~~~~~~~~~~~~~

The calculation strategy used is divided into two steps:


*
    *
        * **Imposed load**: a disruptive load of :math:`1\mathrm{/}1000` of the critical load following :math:`X` is imposed to reveal the buckling mode. This load is applied for :math:`P\mathrm{/}{P}_{\mathit{cr}}\mathrm{=}0.98` and up to :math:`P\mathrm{/}{P}_{\mathit{cr}}\mathrm{=}1.015`.


        * **Imposed displacement**: clear of 1.01, the structure has become very flexible, an increase in displacement DZ is imposed (option DDL_IMPO in STAT_NON_LINE) to determine the post-buckling behavior.


        * The results are in good agreement with the reference solution starting at ETA_PILOTAGE = 1.293. Before this value, the disturbing load (necessary to obtain buckling) degrades the solution, and the differences with the analytical solutions are significant (up to 80%). The corresponding values are subject to non-regression tests. But this difference is only linked to the disturbing load, since by increasing the vertical loading, we find the right solution.


.. csv-table::

    "**DZ**", "**Identification**", "**Instants**", "**Reference**"
    "—0.22", "XX", "1.18684", "0.3595"
    "", "DZ", "1.18684", "—0.22"
    "", "ETA_PILOTAGE ", "1.18684", "1.293"
    "", "MYY ", "1.18684", "519.41"
    "", "", "", ""
    "—0.3255", "XX", "1.24521", "0.396"
    "", "DZ", "1.24521", "—0.3255"
    "", "ETA_PILOTAGE ", "1.24521", "1.518"
    "", "MYY ", "1.24521", "674.3"
    "", "", "", ""
    "—0.4385", "XX", "1.30521", "0.4015"
    "", "DZ", "1.30521", "—0.4385"
    "", "ETA_PILOTAGE ", "1.30521", "1.884"
    "", "MYY ", "1.30521", "849.74"



.. image:: images/1000020000000301000002430858321DB7A91A8B.png
    :width: 3.0429in
    :height: 2.2909in


.. _RefImage_1000020000000301000002430858321DB7A91A8B.png:


.. image:: images/100002000000030100000245C6474CB9ED4E7261.png
    :width: 3.0429in
    :height: 2.2992in


.. _RefImage_100002000000030100000245C6474CB9ED4E7261.png:


* In addition, we test the value of the support reactions at the initial moment in order to validate the consideration of TYPE_CHARGE =' FIXE_PILO 'in CALC_CHAMP/EXCIT when reuse is absent.


.. csv-table::

    "**Identification**", "**Reference value**", "**Reference type**", "**Tolerance**"
    "Field REAC_NODA, NodeN1, DZ Component", "0. ", "'ANALYTIQUE'", "1E-3"



*