Manual pages | Cast3M

$$$$ REAC     NOTICE  CHAT      11/09/12    21:17:52     7124           
                                             DATE     11/09/12

    Operateur REAC                           Voir aussi : BLOQ ANTI
    --------------                                        RELA     RESO   
                                                          SYMT   
    | CHPO2 |  =  REAC  RIG1 | CHPO1 | ;
    | TAB2  |                | TAB1  |
     ( TAB4 = )              | TAB3  |


    Description :
    ____________

    The REACTION operator constructs from the solution CHPO1 of
 a linear system on the first member of which conditions have
 been imposed, the variation of the second member allowing the
 verification of these conditions.

    Contents :
    __________

    RIG1  : object containing among other things imposed  
            conditions (RIGIDITE type)

    CHPO1 : solution field (obtained for instance by means of RESOU)
            (CHPOINT type)

    TAB1  : TABLE object defining the modes, pseudo-modes, ...
                - of BASE_MODALE subtype, or
                - ENSEMBLE_DE_BASES subtype

    CHPO2 : generated field of actions (CHPOINT type, 'discret' nature) 
            required for verifying the imposed conditions

    TAB2  : same structure as TAB1, but completed at the index
              'REACTION_MODALE' for the modes
              'REACTION' for the pseudo-modes,
            by the generated field of actions (CHPOINT type)

    TAB3  : type TABLE, subtype 'LIAISONS_STATIQUES' 
            (TAB4 optional). Must include indices of ENTIER type
            pointing at objects of type TABLE. These ones must include
            an index 'DEFORMEE', CHPOINT type and are completed with 
            an index 'REACTION', CHPOINT type.

    Example :
    _________

    Given RIG1 a structure stiffness matrix, BLO1 the object
 containing the restraints and the relations, FORC1 a field of
 external forces, the displacement fields of the structure
 is obtained by :

             DEP1 = RESOU  ( RIG1 ET BLO1 ) FORC1 ;

    The reactions at the supports are obtained by :

             CHPO1 = REAC  BLO1 DEP1 ;

    Note :
    _______

    If RIG1 does not contain any elementary matrix associated
 with imposed conditions, an empty field CHPO2 should be
 created.