Search found 112 matches
- Thu Aug 17, 2017 12:00 pm
- Forum: OpenSees.exe Users
- Topic: Horizontal gravity in pseudo-static analysis
- Replies: 0
- Views: 1867
Horizontal gravity in pseudo-static analysis
Hi, Is there anyway to turn on/off the horizontal gravitational acceleration (i.e. $b1) in quadUP elements? element quadUP $eleTag $Node1 $Node2 $Node3 $Node4 $thick $matTag $bulk $fmass $PermX $PermY <$b1=0 $b2=0 $t=0> I am trying to perform a pseudo static analysis, and I want to first perform the...
- Wed Mar 22, 2017 11:41 am
- Forum: OpenSees.exe Users
- Topic: Applying displacement and absorbing boundary condition
- Replies: 6
- Views: 7992
Re: Applying displacement and absorbing boundary condition
Sanazzz, 1) Are your base nodes fixed? I expect them to be free to move. 2) My understanding is that the "Mulit-Support Excitation" command applies external displacements to your system. Accordingly, if your earthquake stops, there will be no external displacements added to the system. But...
- Tue Mar 21, 2017 11:00 am
- Forum: OpenSees.exe Users
- Topic: opensees.exe has stopped
- Replies: 2
- Views: 3192
Re: opensees.exe has stopped
Thanks Frank,
We had same problem here too, and it took us lots of time to figure it out. The element/recorder removals are necessities in excavation analyses.
Regards,
Soheil
We had same problem here too, and it took us lots of time to figure it out. The element/recorder removals are necessities in excavation analyses.
Regards,
Soheil
- Mon Mar 20, 2017 10:26 pm
- Forum: OpenSees.exe Users
- Topic: Applying displacement and absorbing boundary condition
- Replies: 6
- Views: 7992
Re: Applying displacement and absorbing boundary condition
You can apply displacements to your model by using "Multi-Support Excitation" command. Just be careful, if you are applying the displacements to a fixed node, your displacements will be the average of zero and the input displacement (double check this as I am not sure).
- Mon Mar 13, 2017 10:08 am
- Forum: OpenSees.exe Users
- Topic: Applying displacement and absorbing boundary condition
- Replies: 6
- Views: 7992
Re: Applying displacement and absorbing boundary condition
Sanazzz, To define absorbing boundary conditions, you need to follow these steps: 1. Remove all the constraints from your base (i.e. both x and y). 2. Tie all the base nodes to one of them in both x and y directions (i.e. equalDOF Node1 Node2 1 2 - Doesn't matter which one. Take one as the master an...
- Mon Mar 13, 2017 9:52 am
- Forum: OpenSees.exe Users
- Topic: Does WipeAnalysis remove Load Patterns?
- Replies: 1
- Views: 2424
Does WipeAnalysis remove Load Patterns?
Hi,
Would you please tell me if the WipeAnalysis command removes all the load patterns defined before it?
Thanks,
Soheil
Would you please tell me if the WipeAnalysis command removes all the load patterns defined before it?
Thanks,
Soheil
- Wed Oct 05, 2016 7:34 am
- Forum: Parallel Processing
- Topic: Extremely Different Results in Cluster vs. PC
- Replies: 2
- Views: 5172
Re: Extremely Different Results in Cluster vs. PC
Dear Frank, Thanks for the comment. The problem was that VT-Cluster server had OpenSees/2.4.5 while I am using the latest version. I checked the displacements and noticed that I am assigning fix boundaries to the base two times during gravity analyses (once before the elastic state and once before t...
- Sun Oct 02, 2016 8:13 pm
- Forum: Parallel Processing
- Topic: Extremely Different Results in Cluster vs. PC
- Replies: 2
- Views: 5172
Extremely Different Results in Cluster vs. PC
Hi, I have a simple 3D model. It applies a ground motion to base of a reinforced soil profile and records the accelerations at its top surface. I run the code on my PC and results are just fine. Then I copy-paste the code to VT-Cluster server (linux machine) and run it there. The results are in orde...
- Fri Sep 09, 2016 2:19 pm
- Forum: OpenSees.exe Users
- Topic: FATAL: second_order_eqn: Complex roots
- Replies: 4
- Views: 5633
Re: FATAL: second_order_eqn: Complex roots
Hi, I faced this problem today, and spent one full day to solve it. Then I said let's add a few lines here for future people. Hopefully, it can save some time for them. The fatal error that we are seeing, is simply because OpenSees cannot solve a 2nd order (quadratic) equation somewhere in the model...
- Fri Aug 26, 2016 5:09 am
- Forum: OpenSees.exe Users
- Topic: uniaxialmaterial hysteretic error
- Replies: 5
- Views: 5326
Re: uniaxialmaterial hysteretic error
For your recorders to save the outputs, you need to wipe out your results. For that, just add "wipe" to the end of your script.
SK
SK
- Thu Aug 25, 2016 4:54 am
- Forum: OpenSees.exe Users
- Topic: uniaxialmaterial hysteretic error
- Replies: 5
- Views: 5326
Re: uniaxialmaterial hysteretic error
Why don't you send us your code for defining the material?
SK
SK
- Fri Aug 12, 2016 5:33 am
- Forum: OpenSees.exe Users
- Topic: Pressure Dependent Multi Yield02
- Replies: 1
- Views: 2389
Re: Pressure Dependent Multi Yield02
Hi Omer, If my understanding is right, the number after the "material" indicates the Gaussian point at which the stresses are calculated. I am not aware of any element with 17 Gauss points. Usually in 2D problems and with quadrilateral elements, we have four Gauss point. Therefore, you rec...
- Wed Aug 10, 2016 7:22 am
- Forum: OpenSees.exe Users
- Topic: Odd records
- Replies: 2
- Views: 2918
Re: Odd records
Hi Jhno, It really depends on the material you are using. For example if you are using ND-Material: PDMY for 2D problems you will record: Sigma_XX, Sigma_YY, Sigma_ZZ, Sigma_XY and Eta_r. Where Eta_r is the ratio between the shear (deviatoric) stress and peak shear strength at the current confinemen...
- Mon Jul 25, 2016 5:11 am
- Forum: OpenSees.exe Users
- Topic: element removing from analysis
- Replies: 2
- Views: 3195
Re: element removing from analysis
Hi, When you remove an element/node, you need to remove it and its connections (if used, e.g. interface elements) from recorder too. This should happen before performing any subsequent analyses. Note that the tags for recorders start from 0, then 1, 2, 3, ... For an example, please check: http://ope...
- Tue Jun 28, 2016 1:12 pm
- Forum: OpenSees.exe Users
- Topic: release the end moment of element
- Replies: 4
- Views: 5055
Re: release the end moment of element
Hi - I am not that much familiar with rigidDiaphragm setting, but can't you remove the rotational constraints on your interested node? (i.e. using the command: remove sp $nodeTag $dof)
Regards,
Soheil
Regards,
Soheil