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There is a “rigidLink” command:
http://opensees.berkeley.edu/wiki/index ... nk_command

Hope that helps!

Seems like the source of the error is because of using 2 model commands. After removing the beam element the model works. Now my question is how can I model a beam element connected to a quad element?

Thanks in advance!

Hi, I have modeled a beam element connected to a quad element. I think I need to put two model commands (I am not sure though), one at the beginning of the code for defining the beam element, and the other one before defining the quad element. Although the quad element is defined correctly, I receiv...

The latest version is 8.5.11. You can download it from the following link or from the OpenSees page after registration.

http://www.tcl.tk/software/tcltk/download.html

I’m glad that the suggestion worked and you solved the problem.
Best of luck in your research!

No problem! Thanks for the file.
My research is not on CBF systems, but I’m learning too. I’m curious what makes the different displacements of the nodes in one type of analysis while there is a constraint between them!
Anybody have any Idea?

I checked displacements of nodes 2, 5, 7, 8, 6 and 4 in a pushover analysis of the system. They all have the same horizontal displacements. Rigid diaphragm definition works well for Static Pushover Analysis of your example then. By the way, could you please send the same EQ file to me (eidinin1 [at]...

Hi, I think the problem lies in the definition of the rigid diaphragm and connectivity. For the time being, just remove the following lines (rigid diaphragm), and monitor the results. You still need to keep the definition of the beam by 2 elements. #rigid diaphragm equalDOF 2 4 1 equalDOF 2 7 1 Now,...

No problem!
Yes, I'm Iranian.

My previous suggestion solves the period problem, but still you need to define 2 beam elements at the top of the bracing:

#beam
element nonlinearBeamColumn 2 5 7 $np $BeamSecTag $transftagbeam
element nonlinearBeamColumn 8 7 6 $np $BeamSecTag $transftagbeam

You need to make a constraint between nodes 2 and 7 too. Just add “equalDOF 2 7 1” to your code and the warnings will disappear.
Hope that helps!

Maryam

Thank you very much André for the reply!

Hi, I need to model a tapered beam element with distributed plasticity. Is there any way other than dividing the beam into smaller elements with constant cross sections? The beam cross section is rectangular, and in the view the cross section changes linearly from one end to the other one. Thank you...