Hello!

Situation:

I`m doing a buckling analysis on a "simply-supported" pinned-end solid beam (IPE-profil) with high slenderness ratio and with a

concentraded/stationary load on the middle on top of the topflange. The topflange is retained against rotation about the

x-axis (the beams neutral axis). The results from the simulation then show buckling of the web. The load is 1 N, so the critical buckling load

will be 1 N multiplied with the BLF if I understanded this correctly?

The main question:

The critical buckling load is based on Euler`s theory and elastic behavior, right?

How do I decide the factor of safety in witch im searching for the design buckling load?

I have read that a safety factor of 4 is a good estimate, but how is this number determined?

Thanks!

I might have posted that at some other point - it was the AMSE pressure vessel code FOS. How it was determined - don't have a clue. Might be experience.

You can do a post buckling analysis and it will be a much closer estimate.

If the structure doesn't move much in a linear buckling estimate - small displacements such that the eccentricities of the loads on the deformed shape are small then it might be close. Best to be cautious if it looks like it moves such that the eccentricities grow by a large amount.