wind 16 16' am日 80 48 (a) q,GC, h q.GC, 9,GC, Section (b)
The dimensions of an enclosed gabled building are
shown in Figure P2.13a. The external pressures for the
wind load perpendicular to the ridge of the building are
shown in Figure P2.13b. Note that the wind pressure can
act toward or away from the windward roof surface. For
the particular building dimensions given, the Cp value for
the roof based on the ASCE standard can be determined
from Table P2.13, where plus and minus signs signify
pressures acting toward and away from the surfaces, re-
spectively. Where two values of Cp are listed, this indi-
cates that the windward roof slope is subjected to either positive or negative pressures, and the roof structure
should be designed for both loading conditions. The ASCE
standard permits linear interpolation for the value of the
inclined angle of roof θ. But interpolation should only
be carried out between values of the same sign. Establish
the wind pressures on the building when positive pressure
acts on the windward roof. Use the following data: ba-
sic wind speed = 100 mi/h, wind exposure category = B,
Kd = 0.85, Kzt = 1.0, G = 0.85, and Cp = 0.8 for windward
wall and –0.2 for leeward wall.
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