DATE     95/01/06
    Opérateur BSIGMA
    ----------------


      FORC1 =  BSIGMA MODL1 SIG1 ( CAR1 ) (HOO1) ;

    Description :
    ___________

    The BSIGMA operator calculates the nodal force field
 resulting from a stress field integration.


      Contents :
      __________


      MODL1 : model object (MMODEL type).

      SIG1  : stress field (MCHAML type, CONTRAINTES 
              subtype)

      CAR1  : field of geometrical properties (MCHAML type,
              CARACTERISTIQUES subtype) required for some elements
              (beams, shells...)
              It is also composed of the material properties for 
              the DST shell element in absence of the field of
              Hooke matrices.

      HOO1  : field of Hooke matrices required for the DST shell
              when CAR1 does not contain the material 
              characteristics (MCHAML type, MATRICE DE HOOKE
              subtype)

      FORC1 : field of nodal forces (CHPOINT type)