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TitleMS-1553
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Page 18

MS 1553 : 2002

8

Cfig aerodynamic shape factor.

Cfs cross-wind force spectrum coefficient generalised for a linear mode shape.

Cp,b external pressure coefficient for sides of bins, silos and tanks.

Cp,e external pressure coefficient.

Cp,i internal pressure coefficient

Cp,l net pressure coefficient for the leeward half of a free roof.

Cp,n net pressure coefficient acting normal to the surface for canopies, free standing roofs,
walls etc.

Cp,w net pressure coefficient for the windward half of a free roof.

Cpl(θb) external pressure coefficient on walls of bins, silos or tanks of unit aspect ratio (c/b =
1) as a function of θb.

c i) constant for ease of calculation (see E4.2.3);

ii) net height of a hoarding, bin, silo or tank (not including roof or lid height); and

iii) height between the highest and lowest points on a hyperbolic paraboloid roof.

d i) minimum roof plan dimension;

ii) depth or distance parallel to the wind stream to which the plan or cross
section of shape extends; and

iii) length of span of curved roof.

da along-wind depth of a porous wall or roof surface.

E the modulus of elasticity.

Et spectrum of turbulence in the approaching wind stream.

e i) the base of Napierian logarithms (≈ 2.71828); and

ii) horizontal eccentricity of net pressure.

F force on building element.

G ratio of peak to mean along-wind response, Ma,p/Ma,m (related to gust effects).

gR peak factor for resonant response (10 min period).

gv peak factor for up-wind velocity fluctuations.

H height of the hill, ridge or escarpment.

Hs height factor for the resonant response.

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