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Re: [TowerTalk] Is A Tower Weaker in Some Directions?

To: "Gene Smar" <ersmar@verizon.net>, towertalk@contesting.com
Subject: Re: [TowerTalk] Is A Tower Weaker in Some Directions?
From: Charlie Gallo <Charlie@TheGallos.com>
Reply-to: Charlie Gallo <Charlie@TheGallos.com>
Date: Sun, 5 Oct 2014 21:23:20 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 10/5/2014 Gene Smar wrote:

>      Now consider the case when the wind is from the single leg side of the
> tower and towards the opposite face.  The single windward leg will be in
> tension and the two opposite legs will be in compression.  Unlike the first
> example with the wind applied on the face, the two leeward legs of the tower
> resist the downward force from the wind with twice the counteracting force
> of a single leg.  To get this tower's two legs to buckle will require twice
> the wind force on the opposite leg vs the single leg example above.

Of  course  this  assumes  the  failure  mode  is due to a compression
failure.   As others have said, there is a significant torsion mode of
failure,  and at least in theory the leg COULD fail in tension, so say
that single up wind leg could fail as it is pulled apart

-- 
73 de KG2V - Charles Gallo
Quality Custom Machine-shop work for the radio amateur (sm)

www.baysidephoto.com
www.thegallos.com

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