Calculating Critical Buckling Load for 3D Rectangular Beam - Ixx or Iyy?

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SUMMARY

The discussion focuses on calculating the critical buckling load for a 3D rectangular beam with a small thickness in the z-direction. When a load is applied in the negative y direction, the appropriate second moment of area to use is either Ixx or Iyy, depending on the buckling plane. Participants suggest computing both Ixx and Iyy to determine which buckling plane is more likely to fail under the applied load. This method provides a practical approach to identifying the critical buckling load for the beam.

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  • Familiarity with second moment of area (Ixx and Iyy)
  • Knowledge of beam theory and mechanics
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I should probably know the answer to this but anyway...

I want to compute the critical buckling load for a simple 3D rectangular cross-section beam, though the thickness in the z-direction is small.

attachment.php?attachmentid=24439&stc=1&d=1268832382.jpg


If a load is applied in the negative y direction, which direction do I use for my second moment of area value? Ixx or Iyy?

Thanks for any info.
 

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How about trying both, then using the results to decide what buckling plane is most likely?
 

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