Load Combinations
Combine load cases with factors for code-compliant analysis.
What are Load Combinations?
Load combinations multiply load case results by factors and sum them:
Combo = f₁×LC₁ + f₂×LC₂ + f₃×LC₃ + ...Example: 1.4D means 1.4 × Dead Load
Creating Combinations
- Open the Load Combinations dialog
- Click "Add Combination"
- Enter a name (e.g., "1.4D")
- For each load case, enter a factor
- Click Save
Common Combinations (ASCE 7)
| Combination | Formula |
|---|---|
| 1.4D | 1.4 × Dead |
| 1.2D + 1.6L | 1.2 × Dead + 1.6 × Live |
| 1.2D + 1.0W + L | 1.2 × Dead + 1.0 × Wind + 1.0 × Live |
| 1.2D + 1.0E + L | 1.2 × Dead + 1.0 × Seismic + 1.0 × Live |
| 0.9D + 1.0W | 0.9 × Dead + 1.0 × Wind |
| 0.9D + 1.0E | 0.9 × Dead + 1.0 × Seismic |
Viewing Combination Results
After running analysis:
- Open the Results dropdown
- Select the load combination
- Results display the factored sum of all included load cases
Envelope Results
Create envelope combinations to find maximum/minimum values across multiple combinations. Useful for design where you need the worst-case scenario.