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eng.steel-column-capacity Calculator
Calculates steel column design strength per AISC 360 from effective length, section properties, and yield strength. The AISC column curve combines the Euler elastic buckling formula for slender columns with an inelastic formula for intermediate and stocky columns.
Inputs
Fy Mpa
Stress at which permanent deformation begins. Design loads should stay below this — apply a safety factor of 1.5–3×.
A Cm2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Iy Cm4
Reference formula or conversion factor shown for context.
Le M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
E Gpa
Material stiffness (GPa). Stress divided by strain in the elastic range. Steel: 200 GPa. Aluminium: 70 GPa. Rubber: 0.01–0.1 GPa.
Results
design buckling resistance Nb,Rd (kN)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
plastic resistance Npl (kN)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
Euler critical load Ncr (kN)
Sample size or count used in the calculation.
non-dimensional slenderness λ̄
Sample size or count used in the calculation.
buckling reduction factor χ
A dimensionless multiplier applied in the calculation.