Overall stability (EQU), 6.5.1
Destabilising vs. stabilising moment, with favourable variable actions correctly excluded from the stabilising sum (gamma_Q,stb = 0) and the lever arm matched to the loaded axis.
EN 1997-1DIN EN 1997-1/NA
Verify isolated footings geotechnically to Eurocode 7
Describe the footing geometry, unit weight, and the loads at its base (characteristic or design, per check). Mia runs the EN 1997-1 checks you select: overall stability, bearing resistance, sliding resistance, core width, highly eccentric loading, or plan-dimension sizing, per the German National Annex.
Worked exampleOverall stability verified
Footing 2.70 x 1.80 x 1.00 m, overall stability (EQU)
Key results
- Destabilising moment Md,dst
- 376.0 kNm
- Stabilising moment Md,stb
- 607.5 kNm
- Utilisation eta
- 0.619
Transparent stepsStandards-basedDocument as PDF
Worked example
Footing 2.70 x 1.80 x 1.00 m, overall stability (EQU)
- Footing
- 2.70 x 1.80 x 1.00 m
- Horizontal load axis
- a-direction
- Self-weight
- 121.5 kN (footing) + 12 kN (column)
Check the overall stability (EQU) of a rectangular isolated footing 2.70 x 1.80 x 1.00 m, gamma = 25 kN/m3, column self-weight 12 kN, VG,k = 366.5 kN, VQ,k = 110 kN, horizontal load along the a-direction HG,k = 50 kN, HQ,k = 26 kN, acting at h = 4 m above the footing base.
Calculate the example with MiaKey results
- Destabilising moment Md,dst
- 376.0 kNm
- Stabilising moment Md,stb
- 607.5 kNm
- Utilisation eta
- 0.619
The favourable variable load VQ,k is excluded from the stabilising sum (gamma_Q,stb = 0), and the lever arm a/2 matches the stated a-direction load axis.
- — Footing and column self-weight are added to the permanent vertical action.
Required inputs
- Footing plan dimensions a x b and thickness t, and the reinforced-concrete unit weight gamma
- Loads at the footing base, stated as characteristic or design (each check uses its own combination); state whether self-weight is already included
- For overall stability and sliding: the axis the horizontal load acts along
- For bearing resistance: characteristic bearing resistance sigma_R,k from a geotechnical report (never derived from soil parameters here)
- For sliding resistance: characteristic base friction angle delta_s,k, and an optional passive earth resistance
- National Annex: German NA (DIN EN 1997-1/NA, Verfahren 2*) only in this version
What you receive
- Utilisation ratio and governing clause for every check you selected
- Eccentricities ea, eb and the resultant's position relative to the footing centre
- Sized footing plan dimensions, for the sizing check
Prepare your calculation
Configure your footing check
System sketch
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m
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kN/m3
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kN
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m
All required fields completed
Inputs completeReady to calculate
What this skill checks
Bearing resistance (GEO), 6.5.2
Effective footing area from the characteristic eccentricities, checked against a characteristic bearing resistance from your geotechnical report.
Sliding resistance (GEO), 6.5.3
Design horizontal action against the characteristic base friction resistance, with an optional passive earth resistance.
1st and 2nd core width (Kernweite)
Permanent-only and permanent+variable eccentricity limits, with each eccentricity correctly paired to its own footing axis.
Highly eccentric loading, 6.5.4
The |e| <= dimension/3 limit under the permanent+variable combination, or a standalone resultant position and eccentricity report without a pass/fail claim.
Footing sizing from the 2nd core width
Iteratively sizes the footing plan (rounded to 5 or 10 cm) so the resultant sits exactly on the 2nd core width boundary.
Frequently asked questions
Which National Annex does this use?
The German National Annex (DIN EN 1997-1/NA, Verfahren 2*) only, in this version. If you name another National Annex, Mia flags the check set as unvalidated for it and offers the German numbers as reference only.
Can it derive the bearing resistance from soil parameters?
No. The characteristic bearing resistance sigma_R,k must come from your geotechnical report (or be supplied directly) — this skill never derives it from soil parameters like phi', c', or gamma.
How is this different from the RFEM foundation design skill?
This skill runs the seven EN 1997-1 checks analytically from geometry and loads you provide, without any RFEM model. For automatic RFEM-based EC2+EC7 foundation design and modelling, use 000015-foundation-design instead.
Can I run just one check, like the core width?
Yes. Tell Mia which of the seven checks you want (overall stability, bearing, sliding, core width, highly eccentric loading, resultant/eccentricity only, or sizing) — only the checks you select are run and reported.
Standards & references
EN 1997-1DIN EN 1997-1/NA
Ready for your first check?
Start with the example and adapt it to your structural system.
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