Search found 913 matches
- Wed Jun 23, 2021 9:01 am
- Forum: OpenSees.exe Users
- Topic: How to model gear-pinion-rack system in OpenSees?
- Replies: 2
- Views: 2010
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.
- Fri Jun 18, 2021 12:23 pm
- Forum: OpenSees.exe Users
- Topic: How to implement a conical spring instead of cylindrical one in OpenSees?
- Replies: 4
- Views: 2763
Re: How to implement a conical spring instead of cylindrical one in OpenSees?
You can try use a hysteretic material to define the force-deformation of your spring: https://opensees.berkeley.edu/wiki/inde ... c_Material
- Fri Jun 18, 2021 11:55 am
- Forum: OpenSees.exe Users
- Topic: nonlinear time history analysis
- Replies: 12
- Views: 11103
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?
- Fri Jun 18, 2021 11:52 am
- Forum: OpenSees.exe Users
- Topic: analyze failed
- Replies: 2
- Views: 2739
Re: analyze failed
Can you run an eigenvalue analysis successfully?
- Tue Apr 13, 2021 2:28 pm
- Forum: OpenSees.exe Users
- Topic: element zeroLengthSection-The moment curvature analysis cannot output the stress and strain of the fiber
- Replies: 11
- Views: 8935
Re: element zeroLengthSection-The moment curvature analysis cannot output the stress and strain of the fiber
You can find the stress-strain recorder command at the very bottom of this link:
https://opensees.berkeley.edu/wiki/inde ... t_Recorder
https://opensees.berkeley.edu/wiki/inde ... t_Recorder
- 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: 5982
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.
- Mon Apr 12, 2021 5:17 pm
- Forum: OpenSees.exe Users
- Topic: My pushover analysis (2D Frame) is not converging.
- Replies: 2
- Views: 3087
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...
- Mon Apr 12, 2021 5:07 pm
- Forum: OpenSees.exe Users
- Topic: Math Does Not Work On OpenSees Wiki
- Replies: 1
- Views: 994
Re: Math Does Not Work On OpenSees Wiki
Because of that issue, documentation is being transferred to GitHub:
https://opensees.github.io/OpenSeesDocumentation/
https://opensees.github.io/OpenSeesDocumentation/
- Mon Apr 05, 2021 10:31 am
- Forum: OpenSees.exe Users
- Topic: Tangent Stiffness Proportional Damping on Updated Frequencies
- Replies: 4
- Views: 8955
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...
- Sun Apr 04, 2021 9:28 pm
- Forum: OpenSees.exe Users
- Topic: Joint2D
- Replies: 2
- Views: 2165
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.
Arash Altoontash, 2004, "Simulation and damage models for performance assessment of reinforced concrete beam-column joints", PhD Dissertation, Stanford University, California, USA.
- Wed Mar 31, 2021 9:50 am
- Forum: OpenSees.exe Users
- Topic: A problem with verification for Forcebased Element
- Replies: 1
- Views: 3221
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...
- Wed Mar 31, 2021 9:44 am
- Forum: OpenSees.exe Users
- Topic: rupture strain of FRP
- Replies: 1
- Views: 1943
Re: rupture strain of FRP
If you do a quick literature search, I think you can find publications related to FRP rupture strain
- Sun Mar 21, 2021 9:17 am
- Forum: OpenSees.exe Users
- Topic: equivalent masonry frame
- Replies: 6
- Views: 2095
Re: equivalent masonry frame
Are you getting this error in gravity analysis? It looks like gravity analysis as you are using load control
- 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: 1445
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
- Sat Mar 13, 2021 10:42 am
- Forum: OpenSees.exe Users
- Topic: Model a diagonal gap
- Replies: 2
- Views: 1853
Re: Model a diagonal gap
Your model with the gap could be unstable when the truss is at an angle