Search found 879 matches

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: 832

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: 343

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: 306

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: 328

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: 396

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: 430

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: 354

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: 762

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: 571

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: 490

Re: Model a diagonal gap

Your model with the gap could be unstable when the truss is at an angle
by selimgunay
Sat Mar 13, 2021 7:53 am
Forum: OpenSees.exe Users
Topic: Overturning moment and Resisting Moment
Replies: 1
Views: 473

Re: Overturning moment and Resisting Moment

For the resisting moment, you should also consider the moments at the bottom of the columns. From equilibrium, overturning moment should be equal to the resisting moment
by selimgunay
Sat Mar 13, 2021 7:50 am
Forum: OpenSees.exe Users
Topic: Problem with the "Pushover Analysis of 2-Story Moment Frame Example"
Replies: 3
Views: 571

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

You can try a different linear system of equations solver and see if it works
by selimgunay
Mon Feb 22, 2021 9:52 am
Forum: OpenSees.exe Users
Topic: How to model a element failure during the seismic excitation?
Replies: 1
Views: 531

Re: How to model a element failure during the seismic excitation?

You can use the remove command or you can check this link here for an example of automated element removal:

https://opensees.berkeley.edu/wiki/inde ... nt_Removal
by selimgunay
Mon Feb 22, 2021 9:50 am
Forum: OpenSees.exe Users
Topic: 3D RC frame Pushover
Replies: 3
Views: 1126

Re: 3D RC frame Pushover

In this case, there should be something that makes your model not stable. Did you check your eigenvalues, are they reasonable? What are your periods?