Assign frames releases

[geoStru]

Hello everyone,
For assign frames releases (joint beam/column) how could I do?
I want assign a hinge joint about connection of the elements beam and column (for example, to obtain M3=0 at the end of the beams)
I tryed with fix $nodetag but I think it is wrong.
I appreciate your help

[selimgunay]

You can generate two nodes with the same coordinates at the member end. One of these nodes will be connected to the member and the other to the joint. Then you can use equaldof constraint for all the DOFs of these two nodes except the one that you want to release.

[mhscott]

If you are using elasticBeamColumn elements, you can specify a moment release.

https://wp.me/pbejzW-Cd

For the nonlinear elements, you'll need to do what Selim said.