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Hi... I am going to run nonlinear time history analysis on a few of my models. I am not sure which kind of structures need leaning column. As far as I understand leaning columns are needed when there are gravity column in a structure and in a 2D model we have to consider their effect. So I think we ...

Thank you...
Suppose that I have a beam with a uniform load.(w)
total weight on beam=wl
mass of each node=(wl)/(2g)
Is it correct?

Hi All, I have a few problems with finding periods in my model. How can I get the periods values? And how can I save these values in a text file? model basic -ndm 2 -ndf 3 # tag X Y node 1 0 0 node 2 3 0 node 3 5 0 node 4 0 3 node 5 3 3 node 6 5 3 node 7 0 5 node 8 3 5 #\\\\\\\\\\\\\\\\\\\\\\\\\ #Re...

Thank you for your reply. I've seen another answer for chord rotation from Frank here... http://opensees.berkeley.edu/community/viewtopic.php?t=20859 As you see Frank said that chordDeformation is the recorder for chord roation. What is the difference between chordDeformation and basicDeformation to...

Hi...
I am not sure if curvature at the IPs is related to chord rotation.
FEMA uses chord rotation for evaluating plastic hinges.
I want to compare FBE rotations with FEMA criteria.
I want to know how does opensees calculate curvature and if it raltes to chord rotation?
Thank you

Hi niloufar

Do you think that I can compare curvature results (deformation recorder) to FEMA criteria?
FEMA considers teta @ teta plastic with chord rotation.

Hi...
I had the same problem...
http://opensees.berkeley.edu/community/ ... =2&t=59682
http://opensees.berkeley.edu/community/ ... =2&t=22338

Dear caosasa
Would you please send the PDF for me?
amir70007-@-yahoo.com
thank you

Hi... If Plasticdeformation records only plastic part of rotations why the results are not zero for elastic response of the element? (I have a recorder for stressstrain of fiber sections that have Fy=2400kg/cm2 to check when fiber section is inelastic) In other words if the stress in fiber sections ...

Thank Dear Vesna...
I could not find the posts about calculate elastic and plastic rotations from curvature at the integration points.

Hi... I have a few question about recorder command: "stressStrain – record stress-strain response. example: recorder Element -file ele1sec1StressStrain.out –time -ele 1 section 1 fiber $y $z <$matID> stressStrain $y local y coordinate of fiber to be monitored* $z local z coordinate of fiber to ...

Hi...
I can not understand what does "fiber 0.1 0.1" do in this command?and for what 0.1 , 0.1?
recorder Element -file Element1_9StressStrain.out -time -ele 1 9 section 1 fiber 0.10 0.10 stressStrain
THX

Hi...

How can I decide about number of subdivisions in a fiber section?
Does it give better results If I model it with more subdivisions?

Thank you Your post was very helpful. I need a source that explains how to use Rayleigh damping and how to determine its parameters practically. I did not find information about "$betaKinit $betaKcomm" in chopra's book For example how can I decide which of the following parameters are need...

Hi...
What is the suitable method of defining Leaning column?
Element with end pin connections?
And the same questions as the 1st post!