NBCC 2020 Load Combination Generator
Enter signed, unfactored loads for one load effect and the tool lists every NBCC 2020 ultimate and serviceability combination that applies, then picks the governing maximum and minimum. Both 1.25D and 0.9D dead-load variants are generated, so uplift and counteracting cases are covered. The governing combinations are shown as substituted equations.
NBCCBy Arun Kishore, P.Eng. Updated
Open calculatoropens in a new tabCode references
- NBCC 2020 Table 4.1.3.2: ultimate limit states, Cases 1 to 5
- NBCC 2020 Table 4.1.3.4: serviceability limit states
Inputs and outputs
| Inputs | Specified loads D, L, S, W and E, signed (uplift negative) |
|---|---|
| Lateral earth or hydrostatic H, prestress or permanent P, temperature or shrinkage T | |
| Unit label (display only) | |
| Live-load occupancy: standard, or storage, assembly or parking | |
| Include ULS, SLS or both | |
| Outputs | Governing maximum and minimum combination, with the substituted equation |
| Table of all active combinations with limit state, clause, expression and total | |
| Number of active combinations |
Worked example
Worked example coming soon.
Limitations and assumptions
- Importance factors are assumed already applied (I = 1.0).
- One generic load effect at a time (all axial, or all moment) in one consistent unit.
- Combinations whose principal load is zero are dropped.
- The SLS factors and the temperature and shrinkage factor are provisional in the app. Verify them against the code tables before relying on SLS results.
These calculators are aids, not a substitute for engineering judgment. Check results independently and against the governing code edition before relying on them.