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Hello Mohsen,

I am dealing with a similar issue and I am not sure why i am getting more displacement for the "one element" frame rather than the frame with 2 elements.
Did you manage to solve the problem, would you mind if we can share some code to overcome this problem?

Thank you.

Regards,
Imad

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!

Hello Frank,

I have a similar issue of a SHORT COLUMN, and i need to get the shear behavior as we are experimentally failing it in shear and not flexure. (1 bay 1 storey)
Fiber Model
NonlinearbeamColumn elements
Beams has elastic material
Confined and Concrete02 and steel01 materials

I was looking into "Flexure-Shear Interaction Displacement-Based Beam-Column Element" but still in the process of rewriting my code to accommodate it.

Would you advice that or how can I implement the section aggregator ?

Thank you!

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).

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!