Search found 583 matches

Mon Jun 14, 2021 6:47 am
Forum: OpenSees.exe Users
Topic: How to simulate the eccentric compression test of column in 3D state.
Replies: 1
Views: 23

Re: How to simulate the eccentric compression test of column in 3D state.

Apply an equivalent force couple to the column node. Force "P" and moment "P*e" where e is the eccentricity.
Fri Jun 11, 2021 1:02 pm
Forum: OpenSees.exe Users
Topic: the problem of the output is 0
Replies: 4
Views: 74

Re: the problem of the output is 0

Node 4 is fixed in the direction of your load.
Fri Jun 11, 2021 5:06 am
Forum: OpenSees.exe Users
Topic: the problem of the output is 0
Replies: 4
Views: 74

Re: the problem of the output is 0

Your load is Z-direction at node 4 but your displacement control is on Y-direction of node 3.
Tue Jun 08, 2021 9:58 am
Forum: OpenSeesPy
Topic: Parametes from J2 plasticity model
Replies: 2
Views: 58

Re: Parametes from J2 plasticity model

The math equations do not render, but delta is an exponential strain hardening parameter and H is a linear strain hardening parameter https://opensees.berkeley.edu/wiki/index.php/J2_Plasticity_Material For linear strain hardening, you can set delta=0 then select H to match a desired plastic stiffnes...
Tue Jun 08, 2021 9:52 am
Forum: OpenSees.exe Users
Topic: Starting a new analysis from the results of a previous one
Replies: 1
Views: 42

Re: Starting a new analysis from the results of a previous one

If you start a second analysis after the first (and do not wipe or reset the model), the state of the model will be retained. Or you can use database commands to save/restore the model, but not all elements/materials implement the appropriate methods. https://portwooddigital.com/2020/12/22/every-end...
Fri May 28, 2021 7:33 pm
Forum: OpenSeesPy
Topic: WARNING material type QzSimple2 is unknown
Replies: 2
Views: 107

Re: WARNING material type QzSimple2 is unknown

OK, should be fixed now and available in a future release of OpenSeesPy.

https://github.com/OpenSees/OpenSees/pull/586
Fri May 28, 2021 11:14 am
Forum: OpenSeesPy
Topic: Learning Openseespy through a very simple example [one more good drift, but still failure]
Replies: 11
Views: 445

Re: Learning Openseespy through a very simple example

This is close to what you're looking for: https://portwooddigital.com/2020/11/03/ ... oad-beams/
Tue May 25, 2021 6:09 am
Forum: OpenSees.exe Users
Topic: How does OpenSees perform dynamic analysis of earthquakes and other dynamic loads at the same time?
Replies: 2
Views: 131

Re: How does OpenSees perform dynamic analysis of earthquakes and other dynamic loads at the same time?

Yes, they can be analyzed at the same time. Define concurrent pairs of load patterns and time series.
Sun May 23, 2021 6:05 am
Forum: OpenSeesPy
Topic: Problems with eleLoad
Replies: 5
Views: 270

Re: Problems with eleLoad

In the RC frame script, GJ is set to 1e100 for the section and the elastic beam!!! Reduce that to something reasonable. Also, use -ele.
Sun May 23, 2021 5:29 am
Forum: OpenSeesPy
Topic: Problems with eleLoad
Replies: 5
Views: 270

Re: Problems with eleLoad

Thanks for the elastic beam. You'll need to use -ele instead of ele Your boundary conditions are not sufficient. You have node 1 as 1 1 1 0 0 0 and node 2 as 0 1 0 0 0 0 - you need to fix torsion at one and and also out of plane translation at node 2 - so for node 1 use 1 1 1 1 0 0 and for node 2 us...
Sat May 22, 2021 7:37 pm
Forum: OpenSeesPy
Topic: Problems with eleLoad
Replies: 5
Views: 270

Re: Problems with eleLoad

Please try a simply-supported elastic beam with distributed load and see if you can get that to work.
Wed May 19, 2021 5:38 am
Forum: OpenSees.exe Users
Topic: Cyclic Point Load
Replies: 2
Views: 173

Re: Cyclic Point Load

You can assign a sine time series to a nodal load.

timeSeries Sine tsTag ...
pattern Plain 1 \$tsTag {
load nodeTag ...
}
Mon May 17, 2021 6:28 am
Forum: OpenSees.exe Users
Topic: Issues on the Stiffness Matrix Extraction & Output
Replies: 3
Views: 229

Re: Issues on the Stiffness Matrix Extraction & Output

This recorder option is not implemented for all elements. Which element are you using?
Mon May 17, 2021 6:24 am
Forum: OpenSees.exe Users
Topic: Problems with the force-based element
Replies: 1
Views: 308

Re: Problems with the force-based element

You have a singular section stiffness somewhere in your model.
Sun May 09, 2021 6:19 am
Forum: OpenSees.exe Users
Topic: fatigue material
Replies: 2
Views: 262

Re: fatigue material

No, you do not need to define fatigue material for the concrete.