CivilLab · Study Aid

Actions & Load Combinations

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What am I seeing?
  • Characteristic actions (unfactored) are multiplied by partial factors to obtain design actions. The bars show each contribution.
  • Eq 6.10 applies both γ factors in full. Eq 6.10a reduces the leading variable by ψ₀ and 6.10b reduces the permanent by ξ = 0.925. The designer may use whichever governs.
  • The three SLS combinations use different ψ factors because rare overloads, frequent service loads and long term loads each matter for a different check.
  • The BS column shows the older 1.4 Gk + 1.6 Qk approach. It is usually more conservative than Eq 6.10, especially when the variable to permanent ratio is low.
  • Changing the building category changes only the ψ factors. Storage (Cat E) has ψ₀ = 1.0 so its 6.10a equals 6.10.