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Notation
b = Width of the structure
e = Edge distance
cpe,10 = External pressure coefficient
h = Height of the structure
qb = Basic velocity pressure
qp(ze)= Peak velocity pressure
ze = Reference height
we = Wind pressure acting on the external surfaces
θ = Wind direction angle
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The wind pressure acting on the external surfaces, we is obtained from equation below.
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The roof, including its protruding parts, should be divided in zones. Pressure coefficients cpe should be defined for each zone. Zones are given in EN 1991-1-4 Figure 7.8. Pressure coefficient values are given in EN 1991-1-4 Table 7.4a and Table 7.4b.
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Pressure coefficient values are given in EN 1991-1-4 Table 7.4a and Table 7.4b.
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In the ideCAD software, the regions to which the pressure coefficients of duopintch roofs will be applied are calculated automatically.
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