FIXSYMM

This command changes the boundary conditions of all the nodes on the symmetric/anti-symmetric planes the user has defined with the SYMM command. If a node is on a symmetric plane the translation in the direction of the normal and the rotations perpendicular to the normal to the plane will be fixed. For anti-symmetric planes the translations perpendicular to the normal and the rotation in the direction of the normal will be fixed. Any nodes that lie on 2 symmetric planes will have the combination of boundary conditions from both planes.