Scope & assumptions
Pin-ended equivalent member with user-entered buckling length, area, second moment and imperfection factor α for the selected buckling curve.
METRIC REPUBLIC ENGINEERING · PRELIMINARY
EC3 Column Buckling Check
EC3-style flexural buckling reduction using Euler critical load, non-dimensional slenderness and user-selected imperfection factor α.
EC3-style buckling curveEuler NcrUser-selected α
Calculation basis
Ncr = π²EI/Lcr²; λ̄ = √(Afy/Ncr); Φ = 0.5[1+α(λ̄−0.2)+λ̄²]; χ = 1/(Φ+√(Φ²−λ̄²)); Nb,Rd = χAfy/γM1.
Important engineering note: Use the correct buckling curve, effective length, cross-section class/effective area and National Annex values. Flexural-torsional buckling, torsional buckling, local buckling and beam-column interaction are not included.
Reference basis
Related tools
Frequently asked questions
Is this a complete code design?
No. It is a transparent preliminary calculation. Code-specific limits, detailing, stability and project conditions must be verified independently.
Can I use the result for construction?
Use the result as a screening or checking aid only. Final design and construction documents should be verified by a qualified professional where required.
Why are some resistance factors entered by the user?
Many design standards contain member-, material-, product- or project-specific values. Metric Republic keeps these visible and user-controlled instead of hiding assumptions.