mesh problem

[shijun@hit.edu.cn]

There is a mesh problem in my model

2022-05-09_142012.jpg (159.04 KiB) Viewed 5882 times

. And this is the model

actual size-480-2.zip

(191.87 KiB) Downloaded 316 times

.
Because the line element was used to establish the boundary column, the actual size of line element need to extend the cetain distance and there is the repeat area

2022-05-09_144551.jpg (38.96 KiB) Viewed 5882 times

. I want to separate the boundary column and web wall in the shear wall to garantee the actual length

2022-05-09_144609.jpg (25.48 KiB) Viewed 5882 times

. The interaction of General link is defined between boundary column and web wall

General link.png (29.26 KiB) Viewed 5882 times

. However, I dont know if the set is correct and the model is abovementioned.

[STKO Team]

There were some issues in your model:

The first error in the mesh is because you used quadratic line elements (3-node line elements) with a beam element that wants only 2 nodes.
Keep in mind that the "quadratic" order means quadratic order of interpolation for displacement and generates element with mid-edge nodes.

Another error is the mesh type. You need:

• Triangular shape with Linear order on the top face
• Quadrilateral shape with Linear order on the other faces

Then I also adjusted your geometry for a structured mesh. Keep in mind that for structured meshes you need 4-sided faces.

Finally the interaction you used are wrong. You need a node-to-node interaction, where the beams are the masters and the shell-sides are the slaves.
Then you need to use a RigidLink boundary condition on them, otherwise the interaction alone is just a geometric feature.

[shijun@hit.edu.cn]

Thank you for your reply.

[STKO Team]

You're welcome

[Charon]

Dear STKO Team，

I also encountered this problem, and after making many changes the error was still not solved, I don't know what went wrong. I have attached the file below.
I would be grateful if you could help me with this problem.

Regards,
Charon

[STKO Team]

The error given in red is pretty clear:
You assigned a 2-node Element Property (dispBeamColumn) to a linear mesh with 3 nodes. This means that somewhere in your mode you use a line mesh with quadratic interpolation (i.e. a 3-node line element).
Please, select all those edges and assign Linear interpolation and re-mesh

meshquad.png (136.84 KiB) Viewed 5472 times

After this, you will see another error regarding the pile-cap coupling condition. I don't know what you are trying to do there, but the interaction you use is wrong

[Charon]

Thank you for your reply！ I will check my model.

[ValentinaSB]

You are welcome!

[Charon]

You are welcome!

Dear STKO Team：

Thanks for the quick reply! I set it up as you suggested and re-mesh it, now it works fine and I can enter the analysis program.
1. As for the interaction issue you mentioned, I am using beamSolidCoupling for my pile-cap connection because I want to use a rigid connection between the pile and the bearing. What is wrong with this?
2. I want to simulate a cluster pile centrifuge shaker test, I set my analysis step according to the webinar section on SSI, but I get an error when running and it shows no convergence, can you help me to check that this is the correct way to set the analysis step? What should I do next?
Sorry I have no experience with other FEM software, so I will make mistakes in many of the most basic questions, thank you for your patience and answers!

Regards，
Charon

[STKO Team]

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