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
> (Ibeams) 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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