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RE: WIND DESIGN-Buffeting?

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-----Original Message-----
From: Wontae Kim [mailto:Wontae.Kim(--nospam--at)unistresscorp.com] 
Sent: Thursday, June 02, 2005 2:46 PM
To: seaint(--nospam--at)seaint.org
Subject: WIND DESIGN-Buffeting?

Hi!
What is the exact definition of 'buffeting'?

-----Original Message-----

"Buffeting" is the result of the forces applied on a structure due to
wind TURBULENCE effects. The most prominent example of a turbulence
effect is "vortex shedding."

"Buffeting" is more pronounced at higher wind speeds--which results in
greater turbulence at the "boundary layer" near the ground where
structurally significant winds will occur. It generally results in
oscillation roughly transverse to the wind direction.

At low wind speeds wind exhibits "laminar" flow.

(Note that "buffeting" is really the EFFECT of wind turbulence, and is
NOT the same thing as the wind GUSTING, the effects of which typically
cause structure movement parallel to the wind direction. However both
effects will be more pronounced for flexible structures).


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