Duopitch Roofs - Wind Pressure Coefficients

Notation

b = Width of the structure
e = Edge distance
c_pe,10 = External pressure coefficient
h = Height of the structure
q_b = Basic velocity pressure
q_p(z_e) = Peak velocity pressure
z_e = Reference height
w_e = Wind pressure acting on the external surfaces
θ = Wind direction angle

The wind pressure acting on the external surfaces, w_e is obtained from equation below.

The roof, including its protruding parts, should be divided in zones. Pressure coefficients c_pe 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.