At 12:12 PM 12/30/2005, K7LXC@aol.com wrote:
>
>In a message dated 12/30/2005 9:23:55 A.M. Pacific Standard Time,
>farmer.aj@gmail.com writes:
>
> >> It's been my experience that rebar in tower bases isn't usually
> >> 'structural'. It's primary purpose is to hold the concrete together
>while it
> >> cures to prevent cracks in it. Rebar schedules are in the drawings for
>each tower
>
> > The rebar is not just to "hold it together while it cures", it
>provides tension strength to the concrete. Concrete has high
>compression strength, but has very little tension strength. The rebar
>provides the tension strength.
>
>
> Okay, I stand corrected. Does that make it "structural"? Wouldn't
>the ground provide the constraint/tension? I can see where a concrete block
>sitting on top of the ground would need the tension but below grade isn't
>that a
>moot point?
No.. you'd be relying on the compressive strength of the soil, which is a
lot less than concrete. It would be much like burying an unwelded tower
segment in dirt. You could, of course, just stick 20% or so the height of
the tower in the dirt without any concrete. This is like putting up a
telephone pole.
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