.. _V2.01.033:

**v2.01.033** SDLD33 - Spectral seismic response of a 2-mass system - 4 springs multi-supported by 2 uncorrelated support groups
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**Summary:**

The problem consists in calculating the spectral response of a 2 mass—4 multi-supported spring system, subjected to multiple seismic excitation, by considering the 3 supports as 2 uncorrelated support groups.

We test the discrete element in traction, the calculation of the natural modes, the static modes and the spectral response by modal superposition via the operator COMB_SISM_MODAL.

Modeling A: this modeling makes it possible to validate the order of the combinations to be considered in the case of the multi-support system, namely intra-group accumulation then inter-group accumulation.

B modeling: this modeling makes it possible to validate the combination rules to be considered in the accumulation of decorrelated support groups with DDS equal intra-group.

C modeling: this modeling makes it possible to validate output options for spectral modal calculations in case of correlated multi-support.

The results obtained are in very good agreement with the reference analytical results.


.. toctree::
    :hidden:

    self

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

    Probl_me_de_r_f_rence
    Solution_de_r_f_rence
    Mod_lisation
    R_sultats_de_la_mod_lisation_A
    R_sultats_de_la_mod_lisation_B
    R_sultats_de_la_mod_lisation_C
    Synth_se_des_r_sultats