Good point! I have both US and Tri-Ex towers - older models. The shop
drawings for both of my tri-ex towers spec A307 as you say but with a bucket
of A325's "use 'em if you got 'em"... which should be OK since they have a
higher strength rating. Interesting to note in stress analysis of the
tri-ex tower design using finite element modeling, the tri-ex design uses
more bolts per leg at lower loadings... I used the model to develop the
leg reactions for subsequent design of adjustable bases. I loaded the
tower model all the way to failure then put a factor of safety in the
reaction loads to get a base design that is predictably stronger than the
tower itself.
Regarding the torqueing thing, jurisdictions of authority are free to adopt
their own standards or modifications therein... and typically do.
Matt
KM5VI
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
kj6y@aol.com
Sent: Tuesday, June 25, 2013 10:33 PM
To: towertalk@contesting.com
Subject: [TowerTalk] A325 bolts 3/4"
These bolts require torquing to 350 lbs. I know US Tower says to just
tightened. I've done installations where the permit required torquing and
had to have a registered deputy inspector watch me torque them to 350 lbs.
Tri-Ex many years ago went from the A325 to a A307. Still high strength but
did not require the torquing.
Skip, KJ6Y
Communications Service Co
Sent from my iPad
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