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Hi everybody, I am modeling an RC beam-column assembly under column removal. In my model, I want to perform a displacement-controlled analysis while material and geometry nonlinearities are considered. For this purpose, I used two different approaches to present beam and columns: 1- dispBeamColumn w...

Hello everybody, I have my experimental data for a 2-story Rc frame. I built its model in OpenSees based on different assumptions as follows: Model #1: Used zero length spring for the plastic hinges and an internal elastic element between them that its stiffness modified for cracking. Model #2: Used...

Many thanks for the reply.

Hello everybody; I would be appreciated if you answer my question about time history analysis. Is there any way to change some model properties (loads, materials, or some modeling parameters) during a transient analysis in a certain time step? can I use a loop to do analysis step by step and change ...

Dear afakhimi I’ve searched for using of hysteretic material in fiber model for making deterioration but there isn’t any valid report or experiment to calibrate it. So I suggest use steel02. Also take a look to section aggregator command in opensees manual and opensees wiki. May be you can make a se...

Dear afakhimi The most effective parameters are Lambda and theta coefficients that can be obtained by empirical formulas that have been given in Lignos dissertation. It must be pointed that he has used capital lambda (ᴧ) so you need convert it to small lambda (λ) by dividing to plastic rotation (Θp)...

Hi dears I want to use Hysteretic Material for my fiber columns instead of Steel02 because the Steel02 doesn’t Make any deterioration in elements. You know the effect of strength deterioration in collapse capacity is significant. But I couldn’t find a good reference for damage parameters for steel c...

Hi dears I want to use modified Ibarra-Krawinkler deterioration model for my steel frames. For testing I have made a simple cantilever beam with concentrated spring at an end. But I don’t know why i don't have any reaction in node 1 that has been fixed!! I always use these recorders and i think i ma...

Thank you vesna I have used fiber section for my nonlinear beam columns. I want to obtain average section rotation and average axial forces in the ends of elements I have used these reorders (element has 5 integration points): recorder Element -xml start.xml -ele 1 section 1 deformation recorder Ele...

What are Section recorder Outputs? Hi dears In accordance to OPENSEES Manual, we have the section recorders for recording section deformations and forces. But I have not found any about these output parameters. For example, section deformation outputs are two. I think the first is average axial defo...

Dear zvidrih thank you . but i have a problem with this code. When i use eval(['!openseespath.exe',' ','matlabinput.tcl']); it works but i have another sourced file (records.tcl) in “matlabinput.tcl” file and must be executed; but it get out this error couldn't read file "records.tcl": no such file ...

Hi everybody I Want to Run Matlab in my Opensees script and wait for Matlab results and then continue my code. I have used this script for invoking Matlab but after runing of this script program runs the rest of Tcl code. At this time Matlab is running still. I wonder if you could help me. Thanks It...

Hi masoudshr Please, read FEMA 356 Chapter 5 page 13. It is about definition of beams rotation. Accordance this definition, if you have used nonlinearBeamColumn with fiber section or Beam With hinges, you can use node recorders (DOF 3) for start and end nodes of elements and then calculate Beam chor...