TORSIONAL BUCKLING

Question was asked:

 

In which conditions torsional buckling of columns will be more critical =
than lateral buckling? I read in a book that torsional buckling in CROSS =
shape columns may govern the allowable axial stress, but there was no =
specific reason mentioned. Has anybody experience in this area?

Thanks,
Hossein Mardanlo

 

 

ANSWER:

 

The slenderness ratio has a lot to do with it.

 

High slenderness: usually bending dominates (Euler)

Low slenderness: usually plasticity governs

Intermediate range: Open sections tend to buckle in torsion-with-bending mode.

Examples: CROSS columns and angles.

 

Sincerely, Gregory from Oz