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Re: [TowerTalk] LM-470 at 100 MPH

Subject: Re: [TowerTalk] LM-470 at 100 MPH
From: jimlux <>
Date: Sat, 29 Nov 2008 21:11:54 -0800
List-post: <">>
Bob Selbrede, K6ZZ wrote:
> Obviously true, however the building department won't look
> at it that way.  They'll want to see an
> analysis/certification showing the conditions under which
> the structure will meet the wind loading requirements.  They
> may accept my committment to "keep it cranked down when the
> winds are up", but I suspect not.  I'll find out soon
> enough.
> Bob  

Bear in mind, also, that there's a big difference between "permanent 
deformation of structure" and "catastrophic failure".. the engineering 
analysis might show that you exceed the yield of the metal, which means 
the tower gets "bent", but doesn't necessarily mean that it will 
collapse into the neighboring pre-school impaling children with Yagi 

On a guyed tower, failure of a guy or tower might well imply 
catastrophic collapse (depending on design).

On a self supporter, though, there's a whole lot of room between "bend" 
and "collapse"

You might well be able to get the city to sign off on an engineer's 
analysis that "collapse" isn't going to happen at 100 mi/hr.  A few 
hundred bucks to an engineer in your local jurisdiction might be money 
very well spent.

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