Question regarding brace buckling

[Joesh]

Hi,

I am a student who just started using OpenSEES, and am trying to model a large multi-bay multi-story 2D steel frame and would like to model brace buckling.

Currently I am thinking about introducing a half sine wave sweep in each brace in the out of plane direction with the maximum deflection equal to the maximum allowable of L/1500. But to do this, I think I will need to change my model from

model BasicBuilder -ndm 2 -ndf 3

to

model BasicBuilder -ndm 3 -ndf 6

am I correct in this regard? Is this the best way to model out of plane brace buckling? It looks like I am going to have to change my elements to their 3D counterparts as well, is this also correct?

[vesna]

look at the PEER 2008/08 report. it explains the modeling of brace buckling.

yes, you are right about the change of your model.