.. _R7.07.01:

**r7.07.01** Limit load calculation using the Norton-Hoff-Friaâ method, behavior NORTON_HOFF
===================================================================================================

**Summary:**

Limit analysis makes it possible to determine the allowable loads of a structure, with a given fixed geometry, made of a material having a resistance criterion. We consider the case of loads consisting of the sum of a permanent load and another parameterized by the load factor, whose extreme bearable value is sought.

After a review of the theoretical formulation, the regularized kinematic approach applied to the VonMises resistance criterion (Norton-Hoff-Friaâ method) and implemented in *Code_Aster* is presented. Refer to [:ref:`bib4 <bib4>`] for the various possible regularization methods proposed in the literature. The calculation of the solutions to this nonlinear problem is then presented and the post-processing providing an estimate of the limit load (an excess value in all cases, and when there is no permanent load, a value by default) is presented.

 **Table of Contents**




.. toctree::
    :hidden:

    self

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

    Formulation_th_orique_de_l_analyse_limite
    Aspects_num_riques_du_calcul_de_la_charge_limite
    Fonctionnalit_s_et_v_rification
    Bibliographie
    Description_des_versions_du_document