3. Principle

The command makes it possible to calculate the combinations of mechanical and thermal loads by superimposing linearly the results of the individual loads, with 3D elements and most of the structural elements: DKT, COQUE_3D, BARRE, 2D_ BARRE, POU_D_T /E/EM/ /E/EM/ TGM, MEMBRANE, GRILLE_MEMBRANE/ EXCENTRE, DIS_T /TR, CABLE.

The mechanical loads that can be taken into account by COMBINAISON_CHARGE are as follows:

• Volumic effort

• Nodal effort

• Distributed effort

• Variable pressure in space

• Compulsory travel

The thermal loads taken into account correspond to thermal expansion, via a cham_mater field from AFFE_MATERIAU/AFFE_VARC by affecting a temperature field or an sd_result data structure (several temperature fields with a list of times).

With each thermal load in the command, mechanical results are calculated with MECA_STATIQUE or STAT_NON_LINE, and two envelope fields, maximum and minimum, are created in order to superimpose with the results of other loads in the combinations.

Note:

The thermal calculation for elements MEMBRANE is approximated by elements DKT.