[TowerTalk] 4 Way Guying

[Chanel1096@aol.com]

In a message dated 3/30/00 11:28:43 PM Eastern Standard Time, 
dx@northcoast.com writes:

> For the record, Rohn tower stress
>  specifications, are, by design, @ 50% of "real world" --just FYI

FYI Under AISC ASD 9ed The steel code used by EIA/TIA-222-F (which 
incidentally Rohn does not always follow)  The factor of safety for columns 
under compression varies from 5/3 to 23/12, However there is an allowable 
stress increase of 33% therefor the 'real' factors of safety range from 5/4 
to 23/16 with the lower number being for shorter members and the large number 
for longer members (length refers to relative length of the member).  So 
actual Rohn specs range from 83% to 70% of the yield for the material. Just 
some food for thought.

-Bill King

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