Search found 13 matches

by alima2065
Sun Mar 06, 2022 1:45 pm
Forum: OpenSees.exe Users
Topic: Convergence Issue
Replies: 0
Views: 12311

Convergence Issue

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...
by alima2065
Tue Jan 23, 2018 9:24 am
Forum: OpenSees.exe Users
Topic: Stiffness modification for fiber elements.
Replies: 0
Views: 1985

Stiffness modification for fiber elements.

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...
by alima2065
Mon Sep 18, 2017 11:08 am
Forum: OpenSees.exe Users
Topic: Updating model properties during time history analysis
Replies: 2
Views: 2963

Updating model properties during time history analysis

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 ...
by alima2065
Sat Jun 09, 2012 12:11 pm
Forum: OpenSees.exe Users
Topic: fiber and ibbara model
Replies: 11
Views: 9103

Re: fiber and ibbara model

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...
by alima2065
Wed Jun 06, 2012 10:11 pm
Forum: OpenSees.exe Users
Topic: fiber and ibbara model
Replies: 11
Views: 9103

Re: fiber and ibbara model

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)...
by alima2065
Sun Jun 03, 2012 7:54 pm
Forum: OpenSees.exe Users
Topic: Use Hysteretic Material instead of Steel02 for columns
Replies: 1
Views: 2139

Use Hysteretic Material instead of Steel02 for columns

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...
by alima2065
Mon May 28, 2012 2:00 am
Forum: OpenSees.exe Users
Topic: Problem in Bilin usage.
Replies: 3
Views: 3696

Problem in Bilin usage.

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...
by alima2065
Tue May 01, 2012 7:59 pm
Forum: OpenSees.exe Users
Topic: What are Section recorder Outputs?
Replies: 3
Views: 3467

Re: What are Section recorder Outputs?

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...
by alima2065
Tue May 01, 2012 6:06 am
Forum: OpenSees.exe Users
Topic: What are Section recorder Outputs?
Replies: 3
Views: 3467

What are Section recorder Outputs?

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...
by alima2065
Thu Apr 19, 2012 11:57 am
Forum: Framework
Topic: parameters optimization in MATLAB with OPENSEES
Replies: 5
Views: 11610

Re: parameters optimization in MATLAB with OPENSEES

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 ...
by alima2065
Sat Apr 14, 2012 8:02 pm
Forum: OpenSees.exe Users
Topic: How Wait for Matlab subprocess in opensees(Tcl programming)
Replies: 7
Views: 7806

How Wait for Matlab subprocess in opensees(Tcl programming)

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...
by alima2065
Sat Apr 14, 2012 12:09 am
Forum: OpenSees.exe Users
Topic: how record the rotate in Hinges in steel frames?
Replies: 14
Views: 12923

Re: how record the rotate in Hinges in steel frames?

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...