.. _V6.02.143:

**v6.02.143** SSNL143 — Validation of the relaxation law for pre-stressed steel cables
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**Summary:**

The objective of this test is to validate the law of relaxation behavior of steel cables used in pre-stressed concrete. The validation is carried out against the expressions from BPEL. Three models are carried out:

• a) Simulation of cable relaxation (class 1, :math:`k1=6.0E-03`, :math:`k2=1.10`) (class 1,,), over a period of 4000 hours, with :math:`\mathrm{\mu }=0.75`.

• b) Simulation of cable relaxation (class 2, :math:`k1=8.0E-03`, :math:`k2=1.25`), over a period of 4000 hours, with :math:`\mathrm{\mu }=0.75`.

• c) Simulation of a relaxation with variable deformation of a cable over a period of 6 years. Over the range [:ref:`0,1an <0,1an>`] imposed deformation :math:`{\mathrm{\epsilon }}_{0}` corresponding to :math:`\mathrm{\mu }=0.75`, over the range] 1 year, 3 years] imposed deformation of :math:`1.025\ast {\mathrm{\epsilon }}_{0}`, over the range] 3 years, 6 years] imposed deformation of :math:`1.050\ast {\mathrm{\epsilon }}_{0}`.


.. 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
    Synth_se_des_r_sultats