Learning Forum

[usmanz]

The paper is (The post-buckled coupled mode interaction behavior of thin-walled members in compression using finite element simulation)

Chapter 5 describes Pinned end conditions in detail in the above paper which is online. I was wondering on how to apply pin ends to the channel column... do I use remote displacement or just displacement and what should the x,y,z and Rx, Ry, Rz be free or zeros.

Dimensions of the channel column are as follow: 

flanges = 50mm

web = 100mm

 

thickness = 1mm 

 

x, y and z for the channel column are the same as the papers so if anyone could please tell me how to apply the pin end to the column.

[peteroznewman]

You might use most of the advice provided the last time you asked this question.

[usmanz]

I did but for some reason, the answers obtained were incorrect

[usmanz]

can you use ansys to check if you get the same answer? im super confused at the moment.

[peteroznewman]

Select the three bottom edges, create a remote displacement. That will create a remote point at the centroid of the thee edges, which is perfect. Set X, Y, Z, Rx and Rz to zero, and leave Ry Free, that is the pin axis.

Select the top three edges and create another remote displacement.  Set Y, Z, Rx and Rz to zero, and leave Ry Free, that is the pin axis.  Set X to some negative number that will compress the column and take it into the post-buckled regime.

 

 

[usmanz]

Yes that's perfect I got the same critical buckling load as the paper by changing the x-component value at the top edge...

How do I apply fix to fix ends for the same channel column, do i use remote displacement or just displacements?

[peteroznewman]

You can just set Ry to 0 and that is Fixed.

[usmanz]

So to get fix-fix end column, I set the remote displacement on top edges to = Y,Z,Rx,Rz,Ry =0 and X=negative number
Remote displacement on bottom edges = X,Y,Z,Rx,Ry,Rz =0
Is this correct for fix-fix end?