mesh problem

[Charon]

There's a problem with the interaction you used for the beam-solid-coupling.

The master should be the beam-end-node (pile-top node)

The slave should be the face of the cap solid
However, since your cap is made of a single cube, there is only one face at the bottom. Doing this, the beam-solid-coupling constraint will make the whole face rigid.
Instead, you should divide it in such a way that you have sub-faces that correspond to the pile-cross section. That is the part that is rigid with the pile

Thanks for the quick reply! I will revise my model and may need your help if I still run into problems.

Regards,
Charon

[STKO Team]

You're welcome

[Charon]

However, since your cap is made of a single cube, there is only one face at the bottom. Doing this, the beam-solid-coupling constraint will make the whole face rigid.
Instead, you should divide it in such a way that you have sub-faces that correspond to the pile-cross section. That is the part that is rigid with the pile

Can you elaborate on this statement? I didn't understand it.
(To the original author of this post, sorry I'm taking up your post to communicate with the STKO team)

Best wishes，
Charon

[Charon]

Dear STKO Team，

I meet a new problem.
I set the master as the pile-top node and the slave as the bottom side of the cap as you suggested, and I retooled the model so that it can now perform operations.

My new problem is that when the initial state analysis is finished, my analysis step number 10 "update plastic" should put the soil into a plastic state. Then the analysis step number 11 "analysis plastic" should start the plastic analysis, right?

However, the content displayed on my cmd.exe window has not changed and remains in the "SUCCESS" state at the end of the previous analysis. The analysis does not seem to be going on? But in the background OpenSees is still running and calling on cpu resources. Why is this? What should I do?
I have attached the file below.

Best wishes，
Charon

[STKO Team]

It's something inside your material model that takes too many iterations inside the plastic integrator.
Try to run it with a very coarse mesh (subdiv=1) just to see that it runs.

I don't know why, in plastic state, it takes so much time. Probably the material entered a very expensive loop. Double check the material parameters and make sure they are correct

[Charon]

Dear STKO Team，

Thank you fast reply, I'll try what you said.
It stands to reason that if the material is ok it won't take so long right?

However, since your cap is made of a single cube, there is only one face at the bottom. Doing this, the beam-solid-coupling constraint will make the whole face rigid.
Instead, you should divide it in such a way that you have sub-faces that correspond to the pile-cross section. That is the part that is rigid with the pile

Can you elaborate on this statement? I didn't understand it.
(To the original author of this post, sorry I'm taking up your post to communicate with the STKO team)

Best wishes，
Charon

Also, can you explain more about this issue I quoted?

[STKO Team]

When you link a face(slave) to a beam-node (master), the whole face will be rigid, and constrained to move/rotate as the beam node.
It makes sense if you only constrain a small portion of the whole cap's bottom face (a portion equal to the beam-cross-section), but not the whole surface