Column with 2 different materials

[imadelkhouri]

Hello,

I am trying to model a Frame with its columns made up of 2 different materials.
I am using a FiberSection to define the cross-section of the column; the column material and steel detailing changes at the top.

So my question is: how do I split the column into 2 elements but keep the behavior as if it is one element. (how should i model the connection).
_________BEAM___________
[**]~~~~~~~~~~~~~~~~~~~~~[**]
[**]~~~~~~~~~~~~~~~~~~~~~[**] <-----
[]~~~~~~~~~~~~~~~~~~~~~~[] <----- How to connect these 2 elements into ONE column behavior
[]~~~~~~~~~~~~~~~~~~~~~~[]
[]~~~~~~~~~~~~~~~~~~~~~~[]
[]~~~~~~~~~~~~~~~~~~~~~~[]
[]~~~~~~~~~~~~~~~~~~~~~~[]
_[]__~~~~~~~~~~~~~~~~~~~_[]__
////~~~~~~~~~~~~~~~~~~~////

Thank you!

[imadelkhouri]

Apologies for posting in the wrong Forum, I was not aware of that.
(but still if you have an answer for my question, it would be much appreciated).

[bahramabdollahi]

hello
i hope you be fine
i think it's better to define two members with different materials and connect both of them with rigid link command.

[imadelkhouri]

Hello and thank you for your reply,

I will try your method soon, but theoretically will that cause a stress concentration at that rigid link point ?
Comparing this to ABAQUS, one full element/column is modeled, then it is partitioned into 2 parts and each assigned a material without having any stress concentrations.

Thank for the support!