Search found 513 matches

by STKO Team
Fri Mar 19, 2021 4:51 pm
Forum: OpenSees Sequential
Topic: Incorrect result when using fixed number of iterations command
Replies: 9
Views: 135

Re: Incorrect result when using fixed number of iterations command

Then you should directly move to explicit dynamics. However, you will find many issues when running explicit dynamics for the first time... The main issue is the critical time step. Theoretically, it should be less than 2/max_freq. However computing the maximum frequency requires the computation of ...
by STKO Team
Fri Mar 19, 2021 12:58 pm
Forum: OpenSees Sequential
Topic: Incorrect result when using fixed number of iterations command
Replies: 9
Views: 135

Re: Incorrect result when using fixed number of iterations command

If you take your FixedNumIter example, reduce the time step by 10 times, you will see that the results are still wrong. But if you switch to Newmark instead of NewmarkHSFixedNumIter it will work. The problem is in the integrator. The NewmarkHSFixedNumIter does a very weird update of the solution. It...
by STKO Team
Fri Mar 19, 2021 12:03 pm
Forum: Analysis
Topic: mass assignment in face
Replies: 13
Views: 433

Re: mass assignment in face

Hi ALok, Here is a working version of your model. It was not running because your vertical analysis was not set up for parallel processing (I added the Parallel RCM numberer and the MUMPS solver). Now it converges till the end. I have only some doubts about your lintels... You added them all over th...
by STKO Team
Wed Mar 17, 2021 11:19 am
Forum: Interaction
Topic: soil structure interaction
Replies: 51
Views: 4963

Re: soil structure interaction

Maybe you are right and in this case, the soil is not affecting the behaviour.. but if I model the springs, it does...You can see that in the plot attached. That's why I wanted to check what happens if I add another type of interaction... Probably the properties you used for the springs were not eq...
by STKO Team
Tue Mar 16, 2021 9:24 am
Forum: Interaction
Topic: soil structure interaction
Replies: 51
Views: 4963

Re: soil structure interaction

I have read this other topic viewtopic.php?f=29&t=1711&p=2350&hilit=CONTACT#p2350. I am not sure if you have modified this element so that the direction can be omitted. I think that it is not available yet from your comment. We are in the last stages of testing this new contact element, it will be ...
by STKO Team
Tue Mar 16, 2021 9:18 am
Forum: Analysis
Topic: Error in Analysis
Replies: 3
Views: 68

Re: Error in Analysis

1. How have you created these extra partitions (Figure attached) in my model?. Is there any particular command to do such partitions, because for me I would have created the whole model from beginning. The lines you highlighted in the picture are not geometric features, they are just the mesh edges...
by STKO Team
Mon Mar 15, 2021 3:49 pm
Forum: Property
Topic: Error in zero length element
Replies: 16
Views: 716

Re: Error in zero length element

Hi, I had a look at your file and it looks like the zero length are properly defined. I have also checked these values for each spring and the behaviour of each model is practically the same. I think that these values are okey for a stiff and soft clay. A) pult=187 kPa / tult=208.47 kPa / qult= 552 ...
by STKO Team
Mon Mar 15, 2021 12:13 pm
Forum: Post processing and data visualization
Topic: Extraction of Reaction Force
Replies: 3
Views: 176

Re: Extraction of Reaction Force

Happy Modeling!
by STKO Team
Mon Mar 15, 2021 12:09 pm
Forum: Mesh
Topic: Removing solid elements
Replies: 10
Views: 320

Re: Removing solid elements

Glad to help! Good luck!
by STKO Team
Mon Mar 15, 2021 11:44 am
Forum: Analysis
Topic: Error in Analysis
Replies: 3
Views: 68

Re: Error in Analysis

The error is saying that the linear solver is unable to do the symbolic analysis of your matrix. This happens either when your model is singular, or when your model is too large to fit a single processor. Your model is fine. But the mesh is too small, in fact you have more than 1 million nodes. Keep...