Volex Labs / Calculations / Reinforced concrete column design to Eurocode 2.

Reinforced concrete column design to Eurocode 2.

Enter the column size, concrete grade, reinforcement and the axial load with moments about both axes — Volex Anvil returns the squash load, the N–M interaction and the biaxial utilisation by the EC2 §5.8.9 exponent method, with the slenderness check and the nominal second-order moment where the column is slender.

Every step carries its clause: the design axial resistance to §6.1, the exponent a interpolated from Nᴇᴅ/Nʀᴅ, and the biaxial interaction (Mᴇᴅᴢ/Mʀᴅᴢ)^a + (Mᴇᴅᵧ/Mʀᴅᵧ)^a ≤ 1 — an auditable calc sheet, not a black-box utilisation.

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What Volex Anvil checks

Validated against the published example

Short braced RC column — squash load and biaxial interaction EC2 §6.1 axial capacity (αcc = 0.85); §5.8.9 Eq (5.39) biaxial exponent method
QuantityPublishedVolex AnvilError
Axial resistance N,Rd3763 kN3763 kN0.00%
Biaxial utilisation0.4690.4690.09%
This case is one of 359 published checks the platform passes — the full table, with every source and every error, is public at volexlabs.com/verification.

Frequently asked

Does it do biaxial bending?
Yes — biaxial columns are checked by the EC2 §5.8.9 exponent method, with the exponent a interpolated from the axial load ratio Nᴇᴅ/Nʀᴅ. Both the uniaxial resistances and the combined utilisation are reported.
Can it handle slender columns?
Yes. The slenderness ratio is compared with the §5.8.3.1 limit λlim; where the column is slender, the nominal-curvature second-order moment (§5.8.8) is added to the first-order moment before the interaction check.
Is the calculation validated?
The axial capacity and biaxial utilisation are checked against EC2 worked examples — squash load within 0.00% and the §5.8.9 utilisation within 0.09%. The verification page lists the cases.
Is it free to use?
The free tier includes 10 calculations a month with the full column check set and clause references. Pro (£29/month) adds unlimited calculations and PDF calc sheets.

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