Run Eurocode Calculations
Select load cases, choose your national annex, and let FrameAI run EN 1993, EN 1992, and EN 1998 checks automatically.
Run Eurocode Calculations
FrameAI automates Eurocode structural checks across steel, concrete, composite, and seismic domains. This guide explains how the calculation engine works and how to interpret the output.
Supported Eurocode standards
| Standard | Scope |
|---|---|
| EN 1993-1-1 | Steel — cross-section classification, member buckling |
| EN 1993-1-8 | Steel — bolted and welded connections |
| EN 1993-1-9 | Steel — fatigue assessment |
| EN 1993-1-10 | Steel — material toughness and Z-quality |
| EN 1992-1-1 | Concrete — RC beams, columns, foundations |
| EN 1994-1-1 | Composite — steel deck + concrete slab beams |
| EN 1998-1 | Seismic — response spectra, q-factor, ductility |
| EN 1991-1-1 | Actions — dead, imposed, crane loads |
| EN 1991-1-3/4 | Snow and wind actions |
How calculation results are structured
Every job produces a structured result object. The key fields for steel members are:
| Field | Description |
|---|---|
memberid | Part mark from the extracted schedule |
profile | Cross-section (e.g., HEB 300) |
lengthm | Effective length in metres |
class | EN 1993-1-1 §5.5 cross-section class |
bucklingx | Flexural buckling utilisation ratio |
bucklingz | Lateral-torsional buckling utilisation ratio |
combined | Interaction formula (6.61/6.62) utilisation |
status | OK, WARNING, FAIL |
Cross-section classification
FrameAI classifies each section per EN 1993-1-1 Table 5.2.
For a welded I-section in bending (internal part, Class 1 limits):
ε = √(235 / fy) where fy is in MPa
c/tf ≤ 9ε → Class 1
c/tf ≤ 10ε → Class 2
c/tf ≤ 14ε → Class 3
c/tf > 14ε → Class 4The effective section properties for Class 4 sections are calculated per EN 1993-1-5.
If you override the material grade, FrameAI recalculates the class automatically.
Member buckling
FrameAI calculates buckling resistances using:
- Flexural buckling about both axes (EN 1993-1-1 §6.3.1)
- Lateral-torsional buckling for beams (EN 1993-1-1 §6.3.2)
- Imperfection factors α (curve a/b/c depending on section type)
- Slenderness reduction factor χ
Load combinations
FrameAI generates load combinations per EN 1990:
| Combination | Formula |
|---|---|
| Characteristic | 1.35 G + 1.5 Q |
| Frequent | G + ψ1 Q |
| Quasi-permanent | G + ψ2 Q |
Understanding warnings
A **WARNING** status means the member is within code limits but approaching a limit (ξ > 0.9). Review the member before approving.
A **FAIL** status means the member exceeds its design resistance. You can:
1. Increase the profile size
2. Reduce the effective length (add lateral restraints)
3. Adjust the connection detail to provide additional stiffness
4. Override the material grade to a higher steel
All overrides are recorded in the job's audit log.
National annex values
The National Annex tab shows which parameters differ from the EN 1993-1-1 normative values:
Exporting calculation results
From the results panel, you can:
- **Download PDF** — full calculation report with formulas, values, and results
- **Download IFC** — model with member metadata including utilisation ratios
- **Share link** — send a read-only view to a client or reviewer
Next steps
Export to Fabrication — download the fabrication package
Shop Drawing PDF — understand what the PDF contains