> The February, 2000 issue of Modern
Steel Construction has an
> article in it by Ioannides and Ruddy
called "Rules of Thumb for
> Steel Design". In it they
present several formulas for figuring the
> approximate section properties,
weights, etc. of various structural
> members. For example,
according to the article, given the weight
> and depth of a wide flange shape,
its strong axis moment of inertia
> can be approximated by the
formula: Ix = D*D*Wt/20.
full article is available online here:
> Don't know how accurate it is;
I just remember reading it and filing
> it away for future reference.
It is just a set of rules of thumb
that get you a quick approximation. Great for meetings in which the owner or
architect throws stuff at you and wants estimates right away. You still have
to check against the code equations in the end, though.