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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