Global Buckling Shape

[Pedro.MQ]

Hello,

I'm trying to get the global buckling mode shapes of my structure (4937 nodes and 11544 bars). The results I got are only local buckling modes (15 modes).. How can I get the global buckling modes?

Thank you,

Pedro

[Artur.Kosakowski]

You need to increase the number of modes and check their shapes to identify the right ones. 

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[Pedro.MQ]

I've increased for 100 modes. There is no global buckling shpe... Only for local elements buckling. Should I increase indefinitely?

Thank you

[Artur.Kosakowski]

Either this or try to use the shift as explained in http://forums.autodesk.com/t5/Robot-Structural-Analysis/Negative-critical-coefficients-in-buckling-a...

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.