Beam continuity is destroyed by rigid and weighted links

[ilyachaban]

Hello, I've been trying to simulate one interesting case in which i did stuck. 
Here is an image of what i've been trying to achieve

Here is an example of using advanced rigid link beam is discontinued after first rigid link is applied

Here is an example of using advanced spring (point to suface(projection)). It is deforming in wrong direction 

Can you help me solve this mystery?

[ilyachaban]

Looks like all models hasn't been uploaded so here it is again

[fdio-2]

Do you mean like this?

These is my boundary conditions and I only use sketches, points and no solid model

 

[ilyachaban]

yes,exactly how you've shown it.
but i have to attach beam to solid geometry by some kind of a link

[SweetPeasHub · Accepted solution]

The mystery is that nodes on solid elements only have 3 dof and links to them will receive this limitation from them. This means that the selection of rotational dof on the advanced rigid link have no effect. It is also quite easy to create dof conflicts and unconstrained conditions when using links.

Add an intermediate rigid link between your original links and the beam that is point to point and the rotational dof are now in effect and can be free. Chaining links like this is not unusual in FEM.

[ilyachaban]

As you are saying it is unusual to use chained linka but it will work for this.
For now I've used solid beam with ridig link on central points and than via spring i've connected solid 3d beam to solid 3d geometry. It takes alot of elements but it was also working