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Your engineer record — printed in the title block of every issued sheet.
Approved by — completed at approval.
A second engineer of your organisation signs this design off at approval; their name, registration and authority appear on the issued drawings automatically.
Your surveyed section and water levels, frozen for reference. Drag the design scour and groundwater lines — or type the depths below.
Which code family the record and terminology follow. The arch rating itself is always CS454 with its single 3.4 global factor; foundations are always checked under EC7 — those pins do not change with this choice.
How much ground investigation you have. Tier 1 works from a presumptive bearing value; Tier 2 unlocks measured strength inputs and the settlement screen.
Drained (granular) or undrained (cohesive) bearing model — changes which strength inputs apply.
Tier-1 allowable bearing pressure from tables for the founding stratum — flagged as a screening value on the sheet.
Drained friction angle — drives bearing capacity, sliding resistance and the earth pressures on the abutment.
Undrained shear strength of the clay at founding level (Tier 2, cohesive soils).
Weight of the founding soil — feeds overburden, bearing and earth pressure.
Depth to the water table below the river bed. Shallow groundwater halves effective stresses and cuts bearing resistance.
Depth below the bed at which ground good enough to found on starts — the footing must reach it.
How deep a design flood can erode the bed (manual input — always verified on site). The footing must found below scour plus an embedment margin.
Peak ground acceleration for the site. At or above 0.10 g the design routes to engineering review (East-African-Rift screen).
The axle the bridge is rated against. It sets the load patch the thrust-line search pushes across the arch and the pass / fail target on the summary step.
Single-axle weight in tonnes for a custom rating target.
The site mortar. It derives an EC6 guide masonry strength (shown as unconfirmed) — the rating uses the recorded strengths below, never the guide.
The stone or block the arch ring is built from — sets the EC6 K class for the guide value.
Compressive strength of the masonry unit itself (not the wall). Raise only with test evidence.
Recorded crushing strength of the ARCH RING masonry — the value the crushing check and the rated axle actually use. Default is conservative.
Recorded strength of the bonded masonry backing over the haunches — weaker than the ring; governs backing-mode crushing on Roman arches.
Unit weight of the masonry — sets the dead load, which stabilises an arch: do not overstate it.
Signed in as . In-envelope designs are issued as a stamped construction pack under your licence; designs outside the envelope are submitted to vada for review. The design itself remains your responsibility as engineer of record.
You have inspected the parameters, site, hydraulics, quantities and drawings above. Approving signs this design off for issuance and stamps you as the approver in the title block of the construction pack.
Starting configurator…