Learning Forum

[Andreyteston]

Hello, members.

I am modeling a circular concrete-filled steel tube. Based on other examples, I have been testing two approaches for the contact between the mechanism and the column.

1) Using command "CEINTF", generating constraint equations at an interface. However, definitively, I don't want to use this command because of the creating of invisible spiders.

2) Using command "CERIG" or "RBE2". However, this command is recommended for linear analysis and small deflections, definitively, my model is non-linear.

3) Using command "RBE3". However, this command to be recommended for linear analysis too, and reading about that I saw that this command is recommended to distribute forces and moments of mass. 

Based on this:

4) What must I use for contact in this region?

5) I would like to use the command "MPC184" connecting all nodes in the faces. Is it possible to connect all nodes of the tube and all nodes of concrete in a master node and all nodes of the mechanisms in the same master node? I am talking about MPC184 because my analysis involves large deformations.

I wonder if any member may help me to solve this problem.

Regards.

[Andreyteston]

Hello, members.

The solution is here: https://forum.ansys.com/forums/topic/constraint-equations-may-not-be-valid-for-elements-that-undergo-large-deflections/

Thank you,

Regards,

Ândrey