How to Calculate Buckling Force for Edge-Applied Loads?

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SUMMARY

Calculating buckling force for edge-applied loads requires understanding the interaction between eccentric compressive loads and bending moments. The discussion emphasizes that such loads generate both axial compressive forces and bending stresses, which are critical in steel structure design. Key references include the AISC ASD (Allowable Stress Design) code and API RP 2a WSD for steel pipes. The combined effects of compressive axial stress and bending stresses must be evaluated against the applicable design criteria for accurate buckling analysis.

PREREQUISITES
  • Understanding of Euler's buckling theory
  • Familiarity with AISC ASD (Allowable Stress Design) code
  • Knowledge of API RP 2a WSD for steel structures
  • Basic principles of structural mechanics, including axial and bending stresses
NEXT STEPS
  • Study the application of Euler's buckling theory to edge-applied loads
  • Review the AISC ASD code for practical design insights
  • Examine API RP 2a WSD guidelines for buckling in steel pipes
  • Learn about the calculation of combined stresses in beam-column systems
USEFUL FOR

Structural engineers, steel design professionals, and students studying mechanics of materials will benefit from this discussion, particularly those focused on buckling analysis in steel structures.

roanoar
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When calculating buckling force i have only found how to calculate it with a force applied to the entire cross section, how can you use Euler's if the force is applied just to an edge or point.


Thanks
 
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An eccentric compressive load will act also like a bending moment, at the same time it generates an axial compressive force. This is closer to what happens in steel structures.

If you are looking for a more theoretical aproach, this link might be useful:

http://www.efunda.com/formulae/solid_mechanics/columns/theory.cfm

Also, I recommend AISC ASD (Allowable Stress Design) old code for an insight of how this behaviour could be taken into account in steel structures design, or API RP 2a WSD for steel pipes.

For short, the compressive axial stress, inplane bending stress and outplane bending stress are added as fractions of the whole beam-column elastic buckling state, and compared to the code's criteria that applies to your specific beam-column.
 
Last edited:
thank you i'll look at this
 

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