Modeling A
==============


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


.. image:: images/10001E70000069D500002D10A1C295348BA567FD.svg
    :width: 552
    :height: 235


.. _RefImage_10001E70000069D500002D10A1C295348BA567FD.svg:


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

Number of knots: 241

Number of meshes and type: 72 TRIA7


Tested values
---------------


.. csv-table::

    "**Identification**", "**Instants**", "**Reference**", "**Aster**", "**% difference**"
    "Limit point no. 1", "", "", ""
    "DZ", "1.03", "—0.0140", "—0.0140", "—0.01322", "—5.573"
    "Eta_ PILOTAGE ", "1.03", "1.0", "0.9729", "—2.471"
    "Endpoint No. 2", "", "", "", ""
    "DZ", "1.78", "—0.0171", "—0.0171", "—0.01696", "—0.847"
    "Eta_ PILOTAGE ", "1.78", "0.375
    0.250", "0.07513", "—75.96"
    "Endpoint No. 3", "", "", "", ""
    "DZ", "2.3", "—0.0140", "—0.0140", "—0.01458", "4.176"
    "Eta_ PILOTAGE ", "2.3", "—0.400
    —0.492", "—0.533", "19.67"
    "Endpoint No. 4", "", "", "", ""
    "DZ", "2.48", "—0.0161", "—0.01617", "0.452"
    "Eta_ PILOTAGE ", "2.48", "—0.633", "—0.6442", "1.717"



notes
---------

The calculation strategy used is divided into two steps:


* calculation under imposed load up to :math:`P=582.N` corresponding to 97% of the critical load,


* "imposed displacement" calculation: then, an imposed displacement is imposed using the technique of the arc length imposed on the entire structure (option LONG_ARC in STAT_NON_LINE).

Using the arc-length technique makes it difficult to define the reference value to be entered in the TEST_RESU command, since these values cannot be imposed. To define the reference values, we looked for the values of :math:`\mathit{DZ}` that were as close as possible to those listed in the table in [:ref:`§2.2 <§2.2>`] and we reported the values of the control parameter that we had to obtain for the values of :math:`\mathit{DZ}` in question.