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Re: [TowerTalk] PIPE ANCHORS

To: Jim Lux <>, towertalk <>
Subject: Re: [TowerTalk] PIPE ANCHORS
From: Kipton Moravec <>
Date: Mon, 31 Oct 2011 23:13:45 -0500
List-post: <">>
On Mon, 2011-10-31 at 19:34 -0700, Jim Lux wrote:
> On 10/31/11 2:02 PM, Dorn Hetzel wrote:
> > But of course, filling the pipe or square tube with concrete probably
> > does help since bending would have to compress the concrete
> > fill and concrete *seriously* resists compression.  Especially if the
> > interior of the tube is rough enough for the concrete to bond
> > to it well (or some bolts are run through or such).
> >
> I'm not sure about that.  I looked through a bunch of references, and 
> nobody seems to have measured the strength with/without concrete.
> Yes, concrete is strong in compression, but think about a pipe full of 
> concrete and bending.  It stretches on the far side, and the concrete 
> just cracks.  Concrete isn't very strong in bending.
> Overall, I don't think concrete fill buys you a lot, structurally, 
> unless you're doing something like a prestressed concrete beam, so the 
> side away from the load doesn't ever get into tension.
> Even in the compression side, the steel probably is stronger than the 
> concrete in compression.  Concrete's big advantage is that it's cheap 
> compared to steel.


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