Pick the section (bar, tube, rectangle, box or I-shape), the material, the supports on each axis and the bracing, and get the critical buckling load, the slenderness, the effective length factor K from finite elements, the buckled shape and the safety factor by Euler, Johnson, AISC 360 or the secant formula for eccentric loads.
Euler applies to long columns (slenderness above Cc = π√(2E/Fy)); intermediate columns use Johnson's parabola.
The length of an equivalent pinned column: Le = K·L, where K depends on the supports (0.5 fixed–fixed, 1 pinned–pinned, 2 fixed–free).
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