recorders which one?

[seu]

I find many recorders in the forum, as example, my nonlinearBeamColumn element 136 has two nodes 125 and 126.

recorder Element -file e136plast.txt -time -ele 136 plasticDeformation; #plasticRotation;
recorder Element -file e136chord.txt -time -ele 136 chordDeformation; #basicDeformation;
recorder Node -file n125.txt -time -node 125 -dof 1 2 3 disp;
recorder Node -file n126.txt -time -node 126 -dof 1 2 3 disp;

I open the C++ source code, and also contrast the results of them ,then find that the parameter "plasticDeformation" is the same with "plasticRotation"; and the "chordDeformation" is the same with "basicDeformation".
Am I right?

Then what do you mean in this topic, while you said "chordRot = nodeRot-basicDef;"
http://opensees.berkeley.edu/community/ ... ord#p45462

because the chordDeform is the same with basicDeformation.

[seu]

Dear vesna,
Need your help. Give me your power.
Thanks.

[seu]

Where are you,dear vesna?
Need your help.

[seu]

hoping your viewing

[vesna]

Sorry for not replying until sooner. What I sad in my previous post is correct.

Chord rotation and basic deformations are not the same. It just happened that the developer of the force-based element used different names for outputting basic deformations.

With using chordDeformation recorder you will not record chord rotation but basic deformations.

[seu]

vesna wrote:
> Chord rotation and basic deformations are not the same. It just happened that the developer of the force-based element used different names for
> outputting basic deformations.
> With using chordDeformation recorder you will not record chord rotation but basic deformations.

you mean both of two parameters here are basic deformation?

Then I must use "nodal rotation - basic deformation" to get the chord rotation?

how about the plasticDeformation? It's the plastic of basic or the chord ?

[seu]

I think the chordRotation-elasticRotation=plasticRotation, is it right?

In the recorder xml files, what do thetaZ(P)_1 and thetaZ(P)_2 mean?
when I apply very small load on the beam 13,the results are:
chord: 0.001 5.9728e-009 -8.23438e-010 4.51237e-008 -2.42711e-010 -2.32515e-010 -2.63267e-010
plastic: 0.001 1.60331e-023 -4.59532e-007 4.59532e-007 -8.39847e-022 8.37831e-022 5.16988e-026
Here,at the time 0.001 second, why the thetaZ_1<thetaZP_1?
Hoping for your help!
Best Regards.

[vesna]

thetaZ(P)_1 and thetaZ(P)_2 are plastic rotations at element ends.

The developer calculates the plastic deformations as (current basic deformation) - (initial flexibility x current element basic forces).

Plastic deformations should not be bigger than the total deformations. What happens if you apply realistic load on your elements?