Search found 883 matches

by selimgunay
Wed Jun 23, 2021 9:01 am
Forum: OpenSees.exe Users
Topic: How to model gear-pinion-rack system in OpenSees?
Replies: 1
Views: 15

Re: How to model gear-pinion-rack system in OpenSees?

There is no built-in command. You can try modeling it with translation and rotation springs.
by selimgunay
Fri Jun 18, 2021 11:55 am
Forum: OpenSees.exe Users
Topic: nonlinear time history analysis
Replies: 11
Views: 3523

Re: nonlinear time history analysis

If you want an identical analysis time step for all motions, you can use the smallest, which is 0.004 sec. But if there is no specific reason for running all with the same analysis step, you can run each with the corresponding ground motion step. What is the period of your structure?
by selimgunay
Fri Jun 18, 2021 11:52 am
Forum: OpenSees.exe Users
Topic: analyze failed
Replies: 2
Views: 120

Re: analyze failed

Can you run an eigenvalue analysis successfully?
by selimgunay
Mon Apr 12, 2021 5:20 pm
Forum: OpenSees.exe Users
Topic: Bridge Model with Truss and Beam-Column Elements OR End Moments Release
Replies: 8
Views: 959

Re: Bridge Model with Truss and Beam-Column Elements OR End Moments Release

If you have distributed forces on the truss elements, that could be the problem.
by selimgunay
Mon Apr 12, 2021 5:17 pm
Forum: OpenSees.exe Users
Topic: My pushover analysis (2D Frame) is not converging.
Replies: 1
Views: 419

Re: My pushover analysis (2D Frame) is not converging.

Instead of the analyze $Nsteps command, you can try other nonlinear solution algorithms, convergence tests and tolerances to overcome the convergence problems. Below is an example of this type of adaptive solution algorithm for nonlinear dynamic analysis. You can adapt it for the nonlinear static (p...
by selimgunay
Mon Apr 12, 2021 5:07 pm
Forum: OpenSees.exe Users
Topic: Math Does Not Work On OpenSees Wiki
Replies: 1
Views: 364

Re: Math Does Not Work On OpenSees Wiki

Because of that issue, documentation is being transferred to GitHub:

https://opensees.github.io/OpenSeesDocumentation/
by selimgunay
Mon Apr 05, 2021 10:31 am
Forum: OpenSees.exe Users
Topic: Tangent Stiffness Proportional Damping on Updated Frequencies
Replies: 1
Views: 394

Re: Tangent Stiffness Proportional Damping on Updated Frequencies

To be able to use tangent stiffness proportional damping, you need to use $betaK or $betaKcomm, where $betaKcomm is preferred for numerical purposes and better convergence. Instead of computing $betaKcomm for each time step and instantaneous frequency, you can approximately compute it for an elongat...
by selimgunay
Sun Apr 04, 2021 9:28 pm
Forum: OpenSees.exe Users
Topic: Joint2D
Replies: 2
Views: 465

Re: Joint2D

You can use it for RC as it was developed as a result of a study that focused on RC structures:

Arash Altoontash, 2004, "Simulation and damage models for performance assessment of reinforced concrete beam-column joints", PhD Dissertation, Stanford University, California, USA.
by selimgunay
Wed Mar 31, 2021 9:50 am
Forum: OpenSees.exe Users
Topic: A problem with verification for Forcebased Element
Replies: 1
Views: 489

Re: A problem with verification for Forcebased Element

You are conducting the analysis with load control and using a large tolerance for the displacement convergence test. From your plot, it is obvious that the solution is not correct and there are errors in the convergence, but the analysis continues probably due to the large norm. I would recommend ru...
by selimgunay
Wed Mar 31, 2021 9:44 am
Forum: OpenSees.exe Users
Topic: rupture strain of FRP
Replies: 1
Views: 414

Re: rupture strain of FRP

If you do a quick literature search, I think you can find publications related to FRP rupture strain
by selimgunay
Sun Mar 21, 2021 9:17 am
Forum: OpenSees.exe Users
Topic: equivalent masonry frame
Replies: 6
Views: 867

Re: equivalent masonry frame

Are you getting this error in gravity analysis? It looks like gravity analysis as you are using load control
by selimgunay
Sun Mar 14, 2021 9:45 am
Forum: OpenSees.exe Users
Topic: Problem with the "Pushover Analysis of 2-Story Moment Frame Example"
Replies: 3
Views: 637

Re: Problem with the "Pushover Analysis of 2-Story Moment Frame Example"

Okay, sounds good. Now I remember other people experienced this problem also and that was the solution
by selimgunay
Sat Mar 13, 2021 10:42 am
Forum: OpenSees.exe Users
Topic: Model a diagonal gap
Replies: 2
Views: 557

Re: Model a diagonal gap

Your model with the gap could be unstable when the truss is at an angle