Search found 913 matches
- Sat Mar 13, 2021 7:53 am
- Forum: OpenSees.exe Users
- Topic: Overturning moment and Resisting Moment
- Replies: 1
- Views: 2515
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
- 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: 1495
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
- 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: 1081
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
https://opensees.berkeley.edu/wiki/inde ... nt_Removal
- Mon Feb 22, 2021 9:50 am
- Forum: OpenSees.exe Users
- Topic: 3D RC frame Pushover
- Replies: 3
- Views: 3880
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?
- Mon Feb 15, 2021 12:49 pm
- Forum: Reliability Analysis
- Topic: Plastic hinge length in Beam with hinge element
- Replies: 1
- Views: 10853
Re: Plastic hinge length in Beam with hinge element
Plastic hinge length equations are all empirical, therefore it is difficult to comment on which one is the best option. But, with the beamwithhinges element, you can choose the larger value not to miss any inelastic effect around the plastic hinge length. You can neglect the axial stiffness by using...
- Mon Feb 15, 2021 12:43 pm
- Forum: OpenSees.exe Users
- Topic: Opensees on AWS amazon
- Replies: 6
- Views: 5828
Re: Opensees on AWS amazon
You can also try running OpenSees SP or MP on Design Safe. It may be possible to get more technical support there.
- Mon Feb 15, 2021 12:36 pm
- Forum: OpenSees.exe Users
- Topic: Support for a new damper
- Replies: 2
- Views: 3334
Re: Support for a new damper
I could not find where $matTag_SD was defined in your script.
- Mon Feb 15, 2021 12:33 pm
- Forum: OpenSees.exe Users
- Topic: MultiLinear Material
- Replies: 1
- Views: 1992
Re: MultiLinear Material
You can assign any value. 2f1, 2f2, etc. in the image are used to show the unloading rules.
- Tue Feb 09, 2021 8:40 pm
- Forum: OpenSees.exe Users
- Topic: The tolerance criteria used to check for convergence
- Replies: 3
- Views: 3639
Re: The tolerance criteria used to check for convergence
If the convergence issues start at low levels of inelasticity, that may indicate that there might be some issues with your material. But, overall if it takes long with many iterations, but if it gets completed with meaningful results, it should be okay
- Tue Feb 09, 2021 3:07 pm
- Forum: OpenSees.exe Users
- Topic: FRP Material
- Replies: 6
- Views: 7384
Re: FRP Material
With Concrete07, it looks like you need to compute the confined concrete properties yourself, The others would do it for you, but I don't know how good they are. You can always try different materials and record the stress and strain at a fiber and check if it looks like what you want
- Tue Feb 09, 2021 2:59 pm
- Forum: OpenSees.exe Users
- Topic: Problem related to Eigen Analysis
- Replies: 1
- Views: 1399
Re: Problem related to Eigen Analysis
It looks like you have a leaning column, You can check if the large period is dues to something wrong that you may be defining with that. So one quick check could be to remove the leaning column and see what happens
- Tue Feb 09, 2021 2:56 pm
- Forum: OpenSees.exe Users
- Topic: The tolerance criteria used to check for convergence
- Replies: 3
- Views: 3639
Re: The tolerance criteria used to check for convergence
1e-4 seems to be a bit large. The best way is to use a smaller tolerance (e.g., 1e-8) and if non-convergence happens, try to overcome that using adaptive strategies (including increase of the tolerance only at the problematic time step). You can also consider using energyincr to start with as it con...
- Tue Feb 09, 2021 8:46 am
- Forum: OpenSees.exe Users
- Topic: 3D RC frame Pushover
- Replies: 3
- Views: 3880
Re: 3D RC frame Pushover
There is a potential convergence problem at that step. How does the pushover curve look like before this convergence issue happens? You can try other nonlinear solution algorithms, convergence tests and tolerances. Below is an example of this type of adaptive solution algorithm for nonlinear dynamic...
- Tue Feb 02, 2021 3:53 pm
- Forum: OpenSees.exe Users
- Topic: Equivalent viscous damping for new damper
- Replies: 1
- Views: 2439
Re: Equivalent viscous damping for new damper
This study can provide good information on the optimized damper locations:
https://peer.berkeley.edu/sites/default ... _mahin.pdf
https://peer.berkeley.edu/sites/default ... _mahin.pdf
- Tue Feb 02, 2021 3:51 pm
- Forum: OpenSees.exe Users
- Topic: Recorder Output and Matlab Post-Processing
- Replies: 1
- Views: 1037
Re: Recorder Output and Matlab Post-Processing
load command in Matlab should not be that slow I think. The best approach could be 1) Make sure your OpenSees file works as intended 2) Run all your analyses 3) Do the postprocess with Matlab This may be faster than finishing the complete OpenSees-Matlab cycle for one ground motion and moving to the...