Search found 611 matches

by STKO Team
Fri Jun 04, 2021 12:50 pm
Forum: Mesh
Topic: mesh type related error
Replies: 5
Views: 90

Re: mesh type related error

It means that you assigned a wrong Element Property (with 5 nodes, what element is that?) to an Edge (mesh with 2 nodes).
This happens when you use the sub-selection and erroneously select the boundary edges of a face or of a solid.

Can your share your SCD file? (Zipped)
by STKO Team
Fri Jun 04, 2021 12:47 pm
Forum: Condition
Topic: Boundary condition Shear wall
Replies: 15
Views: 88

Re: Boundary condition Shear wall

However, even when the monotonic response should be a bit stiffer it should not differ that much. It really depends on how much the first cycles induced tensile damage. What do you suggest I do now? change the elastic parameters until I reduce the difference between both curves in the elastic range...
by STKO Team
Fri Jun 04, 2021 11:00 am
Forum: Analysis
Topic: Issue with using PDMY model
Replies: 21
Views: 245

Re: Issue with using PDMY model

Although I could resolve the convergence error with PDMY by using Enhanced Quad, You are right, some elements like the EnhancedQuand and the 9-Node quad, do not implement in OpenSees the setParameter method, that's why they do not catch the updateMaterialStage call! But the standard quad and the SP...
by STKO Team
Thu Jun 03, 2021 5:49 pm
Forum: Analysis
Topic: Soil-Pile model with dynamic loading-issues
Replies: 9
Views: 126

Re: Soil-Pile model with dynamic loading-issues

The model looks ok. Regarding the topic of adding the raft in a subsequent stage, after the pile settlement: Now it is not possible because you should use 2 subsequent initialStateAnalysis ON/OFF pairs, but this is not supported in OpenSees. There is a bug that prevents doing it more than once. Actu...
by STKO Team
Thu Jun 03, 2021 5:07 pm
Forum: Condition
Topic: Boundary condition Shear wall
Replies: 15
Views: 88

Re: Boundary condition Shear wall

More weird is that I drastically reduce the elastic parameters of the masonry and even then the response was stiff. This is why I thought I had sth wrong with the boundary conditions. In fact, this is what I noticed. Now do not focus on non-linear parameters. You first have to understand why the el...
by STKO Team
Thu Jun 03, 2021 4:30 pm
Forum: Analysis
Topic: Issue with using PDMY model
Replies: 21
Views: 245

Re: Issue with using PDMY model

As I mentioned in a few hours ago, using "EnhancedQuad" element looks resolving the issue that I mentioned although I loose the speed of analysis, unfortunately. Oh I missed it! so if the Enhanced Quad works, it certainly is a problem with the plasticity integration. In fact the Enhanced Quad resol...
by STKO Team
Thu Jun 03, 2021 3:16 pm
Forum: Condition
Topic: Boundary condition Shear wall
Replies: 15
Views: 88

Re: Boundary condition Shear wall

I had a look at your model, and even the elastic range is very different. I don't think it's a problem of boundary conditions... they seem to be applied as you described. Are you sure about the material parameters? Starting from the elastic constants? Do you have any experimental data on the materia...
by STKO Team
Thu Jun 03, 2021 2:42 pm
Forum: Analysis
Topic: Issue with using PDMY model
Replies: 21
Views: 245

Re: Issue with using PDMY model

The reason I ask for is that the LK dashpot and LK bottom (compliant base) in STKO seems not to work properly. The animation result shows that the seismic waves are trapped around the FF column and LK dashpot. Keep in mind that it is not a problem of how they are implemented in OpenSees (and genera...
by STKO Team
Thu Jun 03, 2021 8:39 am
Forum: Condition
Topic: Boundary condition Shear wall
Replies: 15
Views: 88

Re: Boundary condition Shear wall

Ok, so you may want to play with the m1 parameter. It controls how much dilatant your material will be. A value of 0 gives the maximum dilatancy, while a value of 1 gives the minimum. Since your wall is fixed, and the experimental test showed an increasing vertical reaction during the application of...
by STKO Team
Thu Jun 03, 2021 7:46 am
Forum: Interaction
Topic: Pile-soil Interaction Convergence
Replies: 26
Views: 625

Re: Pile-soil Interaction Convergence

You are welcome, let us know how it goes!
STKO Team