BS 6399-2:1995 Loading for buildings - Part 2. Code of practice for wind loads
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This Part of BS 6399 gives methods for determining Fo
the gust peak wind loads on buildings and
components thereof that should be taken into
account in design using equivalent static
procedures.
Two alternative methods are given:
a) a standard method which uses a simplified
procedure to obtain a standard effective wind
speed which is used with standard pressure
coefficients to determine the wind loads for
orthogonal design cases.
NOTE 1. This procedure is virtually the same as in CP3 :
Chapter V Part 2.
b) a directional method in which effective wind 1
speeds and pressure coefficients are determined
to derive the wind loads for each wind direction.
Other methods may be used in place of the two
methods given in this standard, provided that they
can be shown to be equivalent. Such methods
include wind tunnel tests which should be taken as
equivalent only if they meet the conditions defined
in annex A.
NOTE 2. Wind tunnel tests are recommended when the form of
the building is not covered by the data in this standard, when
the form of the building can be changed in response to the test
results in order to give an optimized design, or when loading
data are required in more detail than is given in this standard.
Specialist advice should be sought for building shapes and
site locations that are not covered by this standard.
The methods given in this Part of BS 6399 do not
apply to buildings which, by virtue of the
structural properties, e.g. mass, stiffness, natural
frequency or damping, are particularly susceptible
to dynamic excitation. These should be assessed
using established dynamic methods or wind tunnel
tests.
NOTE 3. See references [1] to [4] for examples of established
dynamic methods.
NOTE 4. If a building is susceptible to excitation by vortex
shedding or other aeroelastic instability, the maximum dynamic
response may occur at wind speeds lower than the maximum.
