Volex Labs / Calculations / Reinforcement anchorage and lap length to Eurocode 2.

Reinforcement anchorage and lap length to Eurocode 2.

Enter the bar diameter, concrete grade and bond conditions, and Volex Anvil computes the design bond strength fbd, the basic required anchorage length lb,rqd, the design anchorage length lbd (with the α coefficients for shape, cover and confinement) and the lap length l0 — for good and poor bond conditions.

Anchorage and curtailment follow EC2 §8.4-§8.7, so the lengths match the code and the Concrete Centre 'How to' guides used for detailing reinforcement.

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What Volex Anvil checks

Design bond strength fbd — EC2 §8.4.2
Basic anchorage length lb,rqd — EC2 §8.4.3
Design anchorage length lbd (α1-α5) — EC2 §8.4.4
Lap length l0 — EC2 §8.7.3
Good / poor bond condition factor — EC2 §8.4.2

Validated against the published example

Rebar anchorage — bond strength and required length EC2 §8.4.2 (fbd); §8.4.3 basic anchorage length lb,rqd

Quantity	Published	Volex Anvil	Error
Design bond strength fbd	3.041 MPa	3.041 MPa	0.00%
Basic anchorage length lb,rqd	715 mm	715 mm	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

Does it handle poor bond conditions?

Yes — the fbd and the required length are increased by the poor-bond factor (η1 = 0.7) for bars in the top of deep pours per EC2 §8.4.2.

Anchorage and laps both?

Yes — the design anchorage length lbd and the tension/compression lap length l0 (with the α6 lap coefficient) are both computed.

Is it validated?

The bond strength and anchorage length are checked against EC2 §8.4 — within 0.00%.

Is it free?

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

Related calculations

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