Answer:
When selecting the global reference coordinate system, you can select special types of hinges, such as the scissor hinge. With scissor hinges, you can model the crossing of beams in RFEM and RSTAB.
Target
In the sample file, you have four members connected in one node. Each of the two member pairs transfers moments in its "continuous direction", but they do not transfer any moments to the other pair. Only axial and shear forces are transferred in the node.
Solution
Use a global hinge definition to realize a scissor hinge in RFEM or RSTAB.
In this case, the hinge must be assigned either to Member 1 and Member 2, or to Member 3 and Member 4. The other crossing member pair is modeled as bending-resistant without hinge.
There is also a short video tutorial about "scissor hinges", which you can watch by clicking the link below.
