.. _U4.42.02:

**u4.42.02** Macro-command MACR_CARA_POUTRE
============================================

This macro command makes it possible to calculate the characteristics of a beam cross section from a 2D mesh of its cross section.

It makes it possible to build a table of values, usable by the command AFFE_CARA_ELEM [U4.42.01] to assign characteristics of straight sections to all the finite elements of beams (models POU_D_E, POU_D_T, POU_D_TG, pou_d_em, pou_d_tgm) or members (modeling BARRE) of any cross section.

The required characteristics are defined in the reference note [:ref:`R3.08.03 <R3.08.03>`]. These are:

• the geometric characteristics (which can be calculated on the full mesh, half mesh with symmetry with respect to :math:`Y` or :math:`Z`, quarter mesh with two symmetries with respect to :math:`Y` and to :math:`Z`),

• the torsional characteristics: torsional radius, torsional stiffness constant, position and eccentricity of the torsional center for the flexion-torsional coupling,

• shear characteristics for models with shear force deformations,

• warping characteristics for torsional models of non-symmetric open sections.

The macro command produces a table_sdaster concept containing the characteristics of the section. The values contained in this table can be used, via Python, in the AFFE_CARA_ELEM command for a beam calculation or by entering the table produced in AFFE_CARA_ELEM using the table_cara keyword.

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    Syntaxe
    Op_randes
    D_finition_des_grandeurs_produites
    Exemples_d_utilisation
    R_f_rences