The dialog box for member eccentricities also corresponds to the dialog box for the calculation with 6 degrees of freedom when using the Warping Torsion add-on. The function of the member eccentricities is described in the chapter Member Eccentricities of the RFEM manual.
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Connection point to adjacent components
If other objects are connected to a member to be calculated with 7 degrees of freedom, the connection point is always assumed to be in the center of gravity. Shear loads from an adjoining component or bearing thus generate an additional torsional moment depending on the position of the shear center.
When calculating members with 6 degrees of freedom, however, shear forces from other components are introduced at the shear center. In both cases, normal forces from other components are transferred in the center of gravity.
If the connection is to be made at a different point, you can model the connection with rigid members or use member eccentricities.