Page 14 prEN 1991-1-4:2004
zmin minimum height
Greek upper case letters
Φ upwind slope Φ1,x fundamental alongwind modal shape θ torsional angle
Greek lower case letters
αG galloping instability parameter αIG combined stability parameter of interference galloping δ logarithmic decrement of damping δa aerodynamic logarithmic decrement of damping δd logarithmic decrement of damping due to special devices δs structural logarithmic decrement of damping ε coefficient ε0 bandwidth factor ε1 frequency factor η variable ϕ solidity ratio, blockage of canopy λ slenderness ratio µ opening ratio, permeability of a skin ν up-crossing frequency, Poisson ratio, kinematic viscosity ρ air density σv standard deviation of the turbulence σa,x standard deviation of alongwind acceleration ψmc reduction factor for multibay canopies ψr reduction factor of force coefficient for square sections with rounded corners ψλ reduction factor of force coefficient for structural elements with end-effects ψλα end-effect factor for circular cylinders ψs shelter factor for walls and fences ψsc reduction factor of force coefficient for scaffoldings effected by solid building face ζ exponent of mode shape
Indices
crit critical e external, exposure
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