.. _V2.01.025:

**v2.01.025** SDLD25 - Spring mass system with proportional viscous damper (spectral response)
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**Summary**

This unidirectional problem consists in carrying out a spectral seismic analysis of a mechanical structure composed of a set of spring weights with viscous dampers subjected to seismic stress provided in the form of a response spectrum of pseudo-accelerating oscillators.

Through this problem, we test the modal combination SRSS of the COMB_SISM_MODAL [:external:ref:`U4.54.04 <U4.54.04>`] operator. In addition, several pre-processing operators are being tested; DEFI_FONCTION and DEFI_NAPPE.

This test is also a POUX resorption test. There is no difference between the Code_Aster results and the POUX results.


.. toctree::
    :hidden:

    self

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

    Probl_me_de_r_f_rence
    Solution_de_r_f_rence
    Mod_lisation_A
    Synth_se_des_r_sultats