Assign frames releases

Forum for OpenSees users to post questions, comments, etc. on the use of the OpenSees interpreter, OpenSees.exe

Moderators: silvia, selimgunay, Moderators

Post Reply
geoStru
Posts: 37
Joined: Mon Aug 24, 2020 12:24 pm

Assign frames releases

Post by geoStru » Wed Sep 23, 2020 11:46 am

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
Posts: 882
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: Assign frames releases

Post by selimgunay » Wed Sep 23, 2020 3:56 pm

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
Posts: 586
Joined: Tue Jul 06, 2004 3:38 pm
Location: Corvallis, Oregon USA
Contact:

Re: Assign frames releases

Post by mhscott » Thu Sep 24, 2020 11:21 am

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.

Post Reply