.. _V6.04.164:

**v6.04.164** SSNV164 - Tension of prestress cables in a 3D beam
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**Summary**

We consider a reinforced concrete beam with a square cross section, composed of two sections of 10 meters in length, having respectively one and four square meters in cross section. The beam is vertical, with the smallest cross section at the bottom. It is embedded at its base, and contains 5 rectilinear pretension cables.

Here we test the phasing of the pretension, that is to say the successive tensioning of the various cables.

The specific functionalities to be tested are as follows:


* operator DEFI_CABLE_BP: determination of the kinematic relationships between the degrees of freedom of the nodes of a cable and the degrees of freedom of the "neighboring" nodes of a concrete structure modelled by elements :math:`\mathrm{3D}` and calculation of the tensions in a cable under the effect of friction and anchor recoil,


* the AFFE_CHAR_MECA operator associated with the RELA_CINE_BP keyword,


* operator CALC_PRECONT: tension of pretension cables with the classical NEWTON method or with the IMPLEX method.


* operator CALC_PRECONT: tension of the prestress cables modelled by BARRE elements with the presence of CABLE_GAINE elements in the model and vice versa (C and D modeling).

The results obtained are validated by comparison with the calculation code CASTEM 2000.

Modeling :math:`B` makes it possible to validate more specifically the use of the CONE keyword in DEFI_CABLE_BP.


.. toctree::
    :hidden:

    self

.. toctree::
    :maxdepth: 2
    :numbered:

    Probl_me_de_r_f_rence
    Solution_de_r_f_rence
    Mod_lisation_A
    Mod_lisation_B
    Mod_lisation_C
    Mod_lisation_D
    Synth_se_des_r_sultats