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The purpose of the command is to calculate the torsor of forces resulting from the action of a given group of elements on a group of nodes at a given point.

The torsors of forces are calculated by calculating (CALC_CHAMP) the nodal reactions (REAC_NODAou FORC_NODA) on the cells entered by the user and then by extracting the nodal reactions on the given group of nodes and integrating these efforts (POST_RELEVE_T). The force torsor is then calculated as a point whose coordinates are specified by the user, in a coordinate system that the user can define.

As part of a modal-spectral analysis, when the result is of the mode_meca type, the user can choose to calculate the contribution of each mode and to combine these contributions via the CQC method. In this case, the user enters information such as the acceleration spectra to use, the amortizations to remember and the type of combinations to be performed. For more information on the spectral method, refer also to documents [U4.84.01] and [R4.05.03]).

The result is a table containing the force torsors for each moment (INST), load case (NOM_CAS), order number (NUME_ORDRE) or mode number (NUME_MODE), according to the data structure of the result at the input of the command.