Volex Labs / Calculations / Seismic design to Eurocode 8.

Seismic design to Eurocode 8.

For buildings in low-to-moderate seismicity — and for export projects that demand an EC8 or ASCE 7 check — Volex computes the design response spectrum for your ground type and behaviour factor, the fundamental period by the Ct method, base shear by the lateral force method, and the storey force distribution.

Each step is validated directly against the EC8 equations (§3.2.2.5, §4.3.3.2.2) and the ASCE 7-22 seismic chapter for US projects.

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What Volex checks

Validated against the published example

Base shear Fb — lateral force method EC8 §4.3.3.2.2 Eq 4.5
QuantityPublishedVolexError
Fb710 kN709.9 kN0.02%
T1 (Ct method)0.648 s0.6479 s0.02%
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 the UK need seismic design?
Rarely for conventional buildings — but export projects, nuclear-adjacent work and some client specs require an EC8 or ASCE 7 verification, which is exactly what this module produces with full clause references.
Which methods are implemented?
The lateral force method with the Type 1/Type 2 spectra and ground types A–E, plus modal response spectrum input and a pushover module for existing buildings.
Can I run ASCE 7-22 instead?
Yes — the equivalent lateral force procedure of ASCE 7-22 is available alongside EC8 for US-code projects.
Is it validated?
Against the code equations themselves and published examples — base shear within 0.02% on the reference case, shown on the verification page.

Related calculations

Wind loading to EN 1991-1-4, with the UK National AnnexSteel beam design to Eurocode 3, in your browserReinforced concrete beam design to Eurocode 2

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