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Linked beams are transformed into 'Supports' (Ref.[2] p22), with elastic restraint.
The direction of the restraint is dependent on the direction of the linked beam:
If the linked beam has an angle less then 45° with the local y-axis of the beam under consideration, the restraint is set as Cy. In all other cases the restraint is set as Cz.
The position of the restraint z(Cy) or y(Cz) is depending on the application point of the linked beam (top/bottom).
The position is only taken into account in case of a flexible restraint (Ref.[2] p23).
The end forces of the linked beam are transformed to point loads on the considered 1D member,
Specifically for U-sections, if the linked beam has an angle less then 45° with the local y-axis of the beam under consideration, the restraint is set as Cz. In all other cases the restraint is set as Cy. This is due to the rotation of U-sections in the FriLo LTBII solver. (see Chapter "Supported Sections")