MESH ERROR SOIL DOMAIN

[allano89]

Dear STKO team
I was modeling the soil-structure interaction with the half-space of soil without problemes. But I modeled the basement and the mesh of the soil dont let me advance in the analysis, please your help
I´ve attached the model and the mistake.
Best regards.

[Lin Sun]

If you look at the error:
File "C:/Program Files/STKO\external_solvers\opensees\element_properties\brick_elements\SSPbrick.py", line 114, in writeTcl
raise Exception('Error: invalid type of element or number of nodes')

Your foundation is four node solid elements (tetra) while using brick elements (hexa). in the mesh, you need to mesh the foundation as hexa not tetra.

[allano89]

Dear Lin Sun
Thanks for your recommendation, I get better meshing but I still have the same problem.
could you expand your answer?
I´ve attached the model and some pictures.

[STKO Team]

You also assigned the sspbrick element property to some Edges of the soil domain. That's why it was keeping on giving the error.

Now it works, but you have another error due to the contact options. Please look at the webinar about the ASDContactElement for more information

04-MODELO UN PISO Y SOTANOS ENFOQUE DIRECTO SUELO NO LINEAL TIME HISTORY.zip

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[allano89]

Dear STKO team
Thanks so much
I get to run the model and I had a razonable results. I´ve attached some pictures of the model.
Now, can I send you the model to some e-mail for your revition? because I want to start my final project with the model that I got made works.
In the same line maybe, Do you have any recommendation to how model the ML (silty - sand) soil with non-linearity? Wich ndMaterial can I use?
Best regards

[STKO Team]

Now, can I send you the model to some e-mail for your revition? because I want to start my final project with the model that I got made works.

Unfortunately we do not include this customized revision of private models in the research license. But you can share here your dubts about analysis results to that it we can check them one by one, and it will be useful for other users.

In the same line maybe, Do you have any recommendation to how model the ML (silty - sand) soil with non-linearity? Wich ndMaterial can I use?

Intermediate soils are hard to model. I don't know if there is a single material that can model it. I know there are the PM4Sand and the PM4Silt materials respectively, but they are only for 2D plane strain problems

[allano89]

Dear STKO team
Thanks a lot. Now I have a problem with the transient analysis. I just modeled layers of the soil.
Please yout help
I´ve attached the mistake and the model.

[STKO Team]

First I removed the eigen, because to make a fast test I partitioned the model in 6 partitions and eigen does not work in parallel.
Then I made a few changes in the constraint handler settings, test norms (in both analyses) and also the stiffness parameter in the embedding domain was too high

[allano89]

Thanks a lot you are the best.
I dont understand what do you mean about " and also the stiffness parameter in the embedding domain was too high"
could expand your answer please?

[STKO Team]

I dont understand what do you mean about " and also the stiffness parameter in the embedding domain was too high"
could expand your answer please?

If you read the documentation of the stiffness penalty parameter, it's suggested to make it few (2 or 3) order of magnitude larger than the Young's modulus of the Embedding Domain (Soil in your case).
It's based on the penalty apporach, so using a too high stiffness can make the convergence difficult