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Re: built up steel column

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>Note that there are limits to the application of sum(bt^3)/3. The
>assumption is that b>>t, but I seem to recall that the results are
>reasonable down to an aspect ratio around b:t = 5:1. In other words, a
>square bar flange doesn't work well in this equation.

Roark gives an approximate correction that works out pretty good:

J = bt^3 [1 - 0.63(t/b)(1 - (t/b)^4/12)]  

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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