[TowerTalk] Question on R-TA-45 Torque Bracket
jimlux at earthlink.net
Fri Jun 14 14:02:01 EDT 2019
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.
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