Bug in RigidLink beam?

[Lost]

Hello! I am trying to use in series a rigidLink beam element and then an equalDOF constraint (for a zero-length element), however I have a problem.
When creating the zero-length element to use after a rigidLink beam and connecting its nodes with equalDOF (all 6 DOFs) the eigenvalues are different than those when using only the rigidLink beam element. However, they are the same as if I were using two equalDOFs in series. Is there a possibility that when a constraint comes after a rigidLink beam, it is treated as equalDOF 1 2 3 4 5 6;
Thanks!

[Lost]

Hm, maybe I haven't followed the rule for the Transformation command:
2) If multiple nodes are constrained, make sure that the retained node is not constrained in any other constraint.
I'll look into it and post again if the problem persists.

[Lost]

Yep, replacing the equalDOFs with very rigid materials in the ZeroLength Element fixed the problem!

[fmk]

another option would have been to use the Penalty method for enforcing the constraints.

[Lost]

Thanks for the answer! I prefer to use the Transformation constraints though so I don't have to change and check the penalty factors and if the results are correct.