[TowerTalk] Question on R-TA-45 Torque Bracket

[jimlux]

On 6/14/19 10:24 AM, k7lxc--- via TowerTalk wrote:
>>      I had one of these on the top guy set of my 110' R45 tower.   And I had torque arms on the lower two guy sets.
>>      My question is aside from twisting, does this change any of the wind loading numbers?
>>      My suspicion is the double guy sets per face can only help but I have never seen it quantified.
>      Since the capacity of a tower is determined by the leg strength, I'd say that the use of a star guy bracket doesn't really do anything to change it. I'm not an engineer so I don't have any calcs to provide.
> Cheers,Steve     K7LXCTOWER TECH

a double guy set would put more down force on the legs, wouldn't it. 
You'd tension the guys all to the same value, and the downforce on the 
legs (and the diagonal braces) would be the sum of the downforce from 
the first set of guys plus that from the second set of guys.

Interestingly, on one analysis I saw, the actual limit was the buckling 
of the diagonal members in the truss sections - they're longer and 
skinnier than the vertical corner members.

The maximum load on a slender column isn't so much the straight up 
compression strength of the metal, but, rather, the column buckling, 
which is more a function of the length/diameter ratio.