In a message dated 1/14/2010 10:37:56 A.M. Pacific Standard Time,
towertalk-request@contesting.com writes:
> Rohn says 25G is not self supportiing, at all, but I have in my hand a
drawing of a Rohn "Self Supporting Base Plate"!!
> SO, keep 'em coming. I'm sifting all the data to decide what I want to
do.
It's obvious that 25G is a strong tower that can do way more than they say.
I'm not trying to cut corners and be unsafe, but would like to know the
real
structural responses in a real tower. Maybe I should use some of my
considerable experience with strain gages!
You're asking engineering questions and you need engineering
calculations to answer them. Strain gauges will tell you at what point
something
failed but I don't think that's the result you're after.
> What I really want, of course is a spreadsheet or drawing giving
windload,
bending, and shear at all points on a 70' stick of 25G! Who knows, I may
have to buckle down and do it myself.
Umm, good idea. More engineering data. And of course if you ask an
engineer a specific question, many times their response is "It depends."
Rohn published a pamphlet called "Manufacturer's Technical Information
For Bracketed or Self Supporting Towers" where they have provided that
information. I have it in a Word file and if you're interested, I'll email it
to you. It's not the whole pamphlet but the pertinent 25G & 45G sections.
Cheers,
Steve K7LXC
TOWER TECH
and
www.championradio.com
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