Autodesk Robot Structural Analysis

[#1]

I'm modeling a monosymetric beam. 

I have the next message : " For bars  1   the program has not performed the lateral buckling verification. Bars were assigned such section types for which the program does not perform the lateral buckling analysis or the lateral buckling verification is not required (for example My = 0.0 - no bending)."

At detailed results Mr was calculated with Z, it should be with S. (see Canadian standard S16-09 Cl 13.6.e)

Can you help me ?

Thanks 

-- 
David Moreno

the model is attached

[#2]

Please make sure that when you save a user defined section in the user section database you select the correct section type and fill in geometrical data needed for calculations of a section class.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[#3]

I was tray with tapered equivalent section (area, I, Z, S…) and it works. But I want to know how I create and use a section built with 2 profiles (W and C).

Thanks a lot

[#4]

The picture you inserted is not displayed correctly. Could you attach it as a compressed file?

[#5]

The picture is attached.

Thanks

[#6 · Accepted solution]

Assuming the verification should be done as for standard I section you have two options:

1. Define this section as a parametric one with one of the flanges defined with thickness and width that would be equivalent for additional channel

2. Save it from the section builder module and decide what value of b and tf enter to determine the section class.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[#7]

One more remark:

for the 1st approach you can save this section from the sections dialog in the user section database and then edit its properties so that they are exactly as calculated for the real shape of the section.