Volex Labs / Calculations / Castellated and cellular beam design to Eurocode 3.

Castellated and cellular beam design to Eurocode 3.

Enter the parent section and opening geometry, and Volex Anvil designs the castellated or cellular beam: the overall bending resistance, the Vierendeel bending across the tee sections at the openings, the web-post buckling and horizontal shear, and the deflection including the shear-flexibility of the perforated web.

Web-post buckling usually governs castellated beams, so it is reported explicitly alongside the geometry, following SCI P355 and the Westok/CelBeam design approach.

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What Volex Anvil checks

Section geometry (depth, opening, web-post) — SCI P355 §2
Overall bending resistance — EC3 §6.2.5
Vierendeel bending at openings — SCI P355 §5
Web-post buckling & horizontal shear — SCI P355 §5
Deflection including web shear flexibility

Validated against the published example

Castellated beam — geometry and governing web-post check SCI P355 §2.3 geometry; §5.1 web-post; Westok / CelBeam

Quantity	Published	Volex Anvil	Error
Castellated depth D	680 mm	680 mm	0.00%
Web-post utilisation	0.946	0.946	0.00%

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

Castellated and cellular both?

Yes — both hexagonal-opening castellated beams and circular-opening cellular beams are supported, with the opening geometry set accordingly.

Does it check web-post buckling?

Yes — web-post buckling and horizontal shear are the governing castellated checks and are reported explicitly to SCI P355 §5.

What is it validated against?

The section geometry and web-post utilisation are checked against SCI P355 and manufacturer design methods — within 0.00%.

Is it free?

Yes — 10 calculations a month free with clause references; Pro (£29/month) adds unlimited runs and PDF calc sheets.

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