[TowerTalk] Lateral Forces on Tower Base?

[leeonline@mindspring.com]

Then a question.   Equalizer plates.  If I understand the function, as the wind
applies force against the top of the tower, the plate then rocks forward and
pulls on the bottom section.

Therefor putting more force on the middle section.

What is wrong with this picture?


I have 80 feet of Rohn 25 with 3 foot in the ground.   800 pounds of cement on
the base, 2 guys per leg with 3'' leg guy brackets.   First guy is up abount 40
feet then the next is up about 65 feet.   The guys do not have EQ brackets but
are joined together to one big turnbuckel.   The guy posts are 2'' 5 foot out
of the ground with 5 in the ground.   Filled with concret and a back guy with
3-4 bags each.

And I'm thinking about another guy on the top section, but do I need anything
else?

Thanks

Lee

Bill Aycock wrote:

> Tom- let me stick in my comments- not as an expert on towers, but in
> understanding what Kurt said.
>
> 1.- his entire set of comments were in the context of the actions that take
> place when line stretches.
>
> 2. when lines stretch, the longer lines stretch more than the shorter ones.
> (ie, the top guy grows more than the lower ones) this is because the
> stretch is the same per unit length, and the upper ones are longer.
>
> 3. if the top guy has stretched more, the tower is going to try to bend
> around the support point of the shorter guy, puting a force TOWARD the
> wind, on the base. Imagine what would happen if the upper guy were made of
> rubber bands, and the base was on wheels.
>
> Bill- W4BSG
>
> At 07:34 AM 8/5/98 -0600, you wrote:
> >
> >>
> >
> >OK, if you dispute that the lateral forces are NOT zero (or near zero)
> >at the BASE of a tower,  would you kindly explain the origin and
> >magnitude of these lateral forces you claim to exist?
> >
>
> Bill Aycock   W4BSG
> Jackson County, AL
> EM64vr
> W4BSG is "vanity" this time, but was
> earned by exam in 1954, the first time.
>
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