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Extended rules of thumb

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Mike Hemstad wrote:

. > Working stress concrete design (OK, all you new guys,
. > flame away): As = M / 1.76 d    (M in ft-k, d in
. > inches), or, far more accurately (good for
. > spreadsheets)

. > Per foot width,
. >  As = ((M, ft-k)^1.04) x 11.84/(Fs (ksi) x d (inches))


And for USD: fy = 60 ksi      2500 <= fc' <= 4500

   Approx.   d = sqrt{70Mu/b}       Mu in ft-kips, b in inches

   Approx.   As = Mu/{4.3 * d}      Mu in ft-kips, d in inches

HTH

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

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