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.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|