Answer:
The nested components of a telescopic boom of a construction machine, for example, transport their forces mechanically between the components.
This special force transfer can be solved in RFEM 6 as follows:
A characteristic plug connection like the one shown in the sketch consists of four members. Two members (Members 2 and 4) lie on top of each other in the overlap area.
You can create superimposed members using line releases. To do this, define a line release on Line 2 that releases Member 2. The line release creates the released Line 4, with the corresponding released Nodes 4 and 5. However, the members should be connected at their nodes, so Line 4 should be defined by the same Nodes 2 and 3 as Line 2. Therefore, the generation of the released Nodes 4 and 5 is prevented by specifying the Definition Nodes 2 and 3.
The properties of the line release are described by hinges in the line release type. The members should be completely decoupled from each other along their length, so that all degrees of freedom are released.
Member 4 can now be defined on Line 2.
To ensure that the force is only transferred by the force pair at the ends of the overlapping members, it is necessary to arrange specific member hinges there.
A moment hinge (scissors hinge) on Members 1 and 2 at Node 2 as well as on Members 4 and 3 at Node 3 should ensure that the bending moment load between the red members (Members 1 and 2) and the green members (Members 3 and 4) is transferred by the force couple on Node 2 and Node 3.
An axial force hinge (scissors hinge) on Members 4 and 3 at Node 3 should ensure that the axial force load is only transferred between the green and red continuous members for the planned fixation at Node 2.
