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Re: vortex shedding

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Dynamic effects are dealt with in the appendices of ASME STS-1-1992.  Just
be careful with units.  For example, I haven't been able to correlate hand
calculations of natural frequency with computer analysis.  

Fountain

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> From: Horning, Dick/CVO <dhorning(--nospam--at)CH2M.com>
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: vortex shedding
> Date: Monday, July 27, 1998 10:16 AM
> 
> 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
> > > 
> > 
> > 
> 
>