a command to record plastic rotation!

[aminmirzaee]

Dear Vesna!!

I saw in a post here, that you answered one of the questions about the plastic rotation....your answer was:
"To get plastic rotation of plastic hinges for element 1 here is the command:

recorder Element -file Element1.out -time -ele 1 plasticDeformation

The file will contain 4 columns. The 1st is time, the 2nd is axial plastic deformation, the 3rd is plastic rotation at node i, and the 4rt is plastic rotation at node j."

can i use this command to record the plastic rotation for a beam that is defined by nonlinearbeamcoloumn element?!

[vesna]

Yes, you can. Acctually, plasticDeformation is valid argument only for nonlinearBeamColumn (forceBeamColumn) element.

[aminmirzaee]

dear Vesna
tanks for your answer!
I tried this command for a beam in a simple symmetric steel moment frame with nonlinearbeamcolumn elements, but the plastic rotations at two ends were different!
I am confused and do not know the problem!

[vesna]

What type of load did you apply to your model?

[aminmirzaee]

Dear Vesna!

I've Found my mistake!

Tnx