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RE: vortex shedding

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ASME has a publication dealing with all facets of design of steel
stacks.  The designation is  STS-1-1992.  SMACNA Guide for Steel Stack
Design and Construction also has useful information, but I didn't see
anything about dynamic wind effects in my 1990 copy.

> ----------
> From: 	P.Rajendran[SMTP:rajendra(--nospam--at)edumaster.net]
> Sent: 	Saturday, July 25, 1998 6:09 AM
> To: 	seaint(--nospam--at)seaint.org
> Subject: 	Re: vortex shedding
> 
> I have been trying find some reference material for designing spoilers
> on tall stacks.  Your participation in discussing "vortex shedding"
> makes me believe that you may have some leads to the information I am
> seeking.  If you have such information, please respond to my email
> address which is: rajendra(--nospam--at)edumaster.net.
> 
> Thanks
> 
> Rajendran
> 
> Christopher Wright wrote:
> > 
> > >the wind load acting only onto
> > >the upper third of a column while checking vortex shedding
> instability.
> > >
> > >Does any one of you know the justification of this assumption?
> >  My guess is that the 'instability' (I think it's actually flutter)
> only
> > imposes dynamic loading on the upper 1/3 because the movement of the
> > lower portion is too small to shed vortices. Could also be that the
> > bottom two thirds lies in the boundary layer or lies in the lee of
> > surrounding structures. All of which is preamble to saying I don't
> > actually know.
> > 
> > Christopher Wright P.E.    |"They couldn't hit an elephant from
> > chrisw(--nospam--at)skypoint.com        | this distance"   (last words of Gen.
> > ___________________________| John Sedgwick, Spotsylvania 1864)
> > http://www.skypoint.com/~chrisw
> > 
> 
>