Load Combination Generator

Structures are designed to avoid unrealistically high loads by identifying a dominant action.

Permanent Loads (G): Self-weight. Always present. Multiplied by γ_G.
Leading Variable Action (Q_lead): The dominant load (e.g. Max Wind). Multiplied by γ_Q.
Accompanying Actions (Q_others): Occur simultaneously but reduced by ψ (e.g. 0.7 × Q).

1. Define Actions (Loads)

Action Name

Type ?

Category (ψ Lookup) ?

Value (kN)

Mark as Stabilising? (For EQU Uplift Checks) ?

ID	Name	Type	Category	ψ₀	ψ₁	ψ₂	EQU Role	Value

Ultimate Limit States (ULS)

STR (Set B)
Structural failure (Beams, Cols)

GEO (Set C)
Geotechnical (Footing size)

EQU (Set A)
Equilibrium (Overturning)

Seismic / Acc
Earthquake, Fire, Impact

Serviceability Limit States (SLS)

Characteristic
Irreversible (Yield check)

Frequent
Reversible (Cracking)

Quasi-Permanent
Long-term (Deflection)

Action Category	ψ₀ (Combo)	ψ₁ (Freq)	ψ₂ (Quasi)
Cat A: Domestic, Residential	0.7	0.5	0.3
Cat B: Office areas	0.7	0.5	0.3
Cat C: Congregation areas	0.7	0.7	0.6
Cat D: Shopping areas	0.7	0.7	0.6
Cat E: Storage areas	1.0	0.9	0.8
Cat F: Traffic area (weight ≤ 30kN)	0.7	0.7	0.6
Cat G: Traffic area (30kN < weight ≤ 160kN)	0.7	0.5	0.3
Cat H: Roofs	0.0	0.0	0.0
Snow: Altitude < 1000m	0.5	0.2	0.0
Snow: Altitude > 1000m	0.7	0.5	0.2
Wind: All buildings	0.6	0.2	0.0