[TowerTalk] PIPE ANCHORS

[Bill Gillenwater]

So, what is the best anchor for sandy soil, like in central Florida?
73 Bill K3SV

----- Original Message ----- 
From: "Jim Lux" <jimlux at earthlink.net>
To: <towertalk at contesting.com>
Sent: Sunday, October 30, 2011 2:51 PM
Subject: Re: [TowerTalk] PIPE ANCHORS


> On 10/30/11 10:39 AM, Grant Saviers wrote:
>> A couple more comments, some not covered before:  (all comments w/o
>> engineering calcs - YMMV)
>>
>> 1.  Square tube is stiffer/stronger than round pipe or wide flange beams
>> (I-beams) of same #/ft..
> 
> Hmm. I'm not sure this is true.  Bending strength goes as the radius to 
> the 4th power, and for a given perimeter, a circle has the section 
> moment.  (sort of like a circle has the most included area for a given 
> perimeter).
> 
> Cross sections with right angles are easier to use in construction, 
> especially for bolted connections, and a I beam typically has more metal 
> farther from the center than a square tube (which is why they use that 
> shape).
> 
> However, in "practical sizes commonly sold" it might be true that 
> squares are stronger than circles.
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