Search found 4 matches

by jiadarenUA
Tue Aug 25, 2020 12:44 pm
Forum: Framework
Topic: In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal DOF
Replies: 6
Views: 1472

Re: In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal

Thank you very much for your help and patience Dr Scott. I think basically I get your meanings, but maybe I need to learn more knowledge about the FE formulation based on the basic system. Could you please recommend me some references about the displacement-based FE formulation based on the basic sy...
by jiadarenUA
Sat Aug 22, 2020 1:17 pm
Forum: Framework
Topic: In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal DOF
Replies: 6
Views: 1472

Re: In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal

Hi Dr Scott, Thank you very much for your reply. I am sorry that I can not understand well that you mentioned "you'll want to have 6 local DOFs and 3 basic DOFs, then have an internal DOF". I am trying to develop a flexure-shear coupled displacement-based beam element in OpenSees, so I want to use a...
by jiadarenUA
Fri Aug 21, 2020 1:52 pm
Forum: Framework
Topic: In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal DOF
Replies: 6
Views: 1472

Re: In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal

Hi Dr Scott, Thank you so much for the suggestions. It is so amazing that it is you who replied to my question. I am actually a big fan of your research work. For my question, I also think I should still be able to use the basic system with 4 DOFs , and then I will use static condensation to get it ...
by jiadarenUA
Fri Aug 21, 2020 11:21 am
Forum: Framework
Topic: In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal DOF
Replies: 6
Views: 1472

In the formulating of beam elements, is the concept of the basic coordinate system still valid when we have internal DOF

Hi all, I am trying to study how to develop a new displacement-based beam element in the OpenSees source code, and I got confused with the basic coordinate system. For a general displacement-based beam element, 6 DOFs are expected in the local coordinate system. In the source code of the OpenSees, t...