Autodesk Robot Structural Analysis

[#1]

Hi, I am trying to create a Z-Purlin using section builder. But to do that, I am creating the section in autocad then transforming it to robot using import as dxf. The problem is I am getting weird things after I import it. Please see figure. I get weird results even if i draw a rectangular section. Any ideas.

[#2]

Please attach this dxf

[#3]

dxf attached

[#4]

Set correct units before importing.

If you want to calculate it as thin walled section you  have to import only one  "middle" line.

Dxf for thin walled section attached.

[#5]

thanks for your reply. However, could you please enlighten me as to why I would want to import and analyze the purlin as a thin walled sections. I know this is not a robot question, but the help would be greatly appreciated. 

[#6]

I have checked results and they are comparable so no need to use thin walled approach.

As far as I remember theory says : section part thickness divided by height or width of section > 0.1 -> thick walled