constraints Transformation or Plain

khatibi_m · Post by **khatibi_m** » Sun Oct 31, 2010 5:40 am

Dear

I modeled 2-D RC resistant frame by considering soil-structure interaction. The model was subjected to nonlinear dynamic analysis. Nodes of each story were restricted in x direction by equalDof command. I used â€œconstraints Transformationâ€

vesna · Post by **vesna** » Mon Nov 01, 2010 11:02 am

Transformation constraint currently donâ€™t allow master node in one
constraint to be a slave node in another constraint. Make sure you do not have this situation.

Plain constraint supports equaDOF command bat not rigidLink.

I do not know enough about your model to be able to say which one will work better for you.

sajad.gh · Post by **sajad.gh** » Tue Nov 02, 2010 7:18 am

Dear fmk
please reply to above question?
You explain about Constraints Plain and Transformation!

Thanks,
Sgh

silvia · Post by **silvia** » Tue Nov 02, 2010 7:57 am

The Cook Book on finite element has a great explanation about these handlers. they are not OpenSees-specific.

sajad.gh · Post by **sajad.gh** » Tue Nov 02, 2010 11:47 pm

Dear Silvia
Thanks for your attention,
What's your opinion about using of the Constraint Plain or Transformation for nonlinear time history analysis in my model (RC moment frame) with equalDof?Which is Constraint Handler suittable for this modeling?
Meanwhile, I performed static analysis before nonlinear time history analysis.

Respectfully,

Sadjad.Gh
UK-I