"Bill" wrote:
Thank you for extending my "universe" of materials (and building
techniques)!
Where I grew up, an I-beam really looked like an I-beam. I see that
things are more complicated now!
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Dig out a strength of materials text, learn and understand the
following:

I^3 = (bh^3)/12 + 1/2(Ad^2)

It's the basis of all beam design and application.

Lew