# Steel rules of thumb

• To: seaint(--nospam--at)seaint.org
• Subject: Steel rules of thumb
• Date: Wed, 27 Feb 2002 13:02:40 -0800 (PST)
```>From: Daryl Richardson
>Subject: Re: Steel rules of thumb
>To: seaint(--nospam--at)seaint.org

>Charlie,

>	Here's a rule of thumb that's very handy for >quick
and dirty
>calculations for beam deflection.

>	Delta(max) = M*L^2/(10*E*I)

Daryl,
I've derived the same equation--it's very handy.  With
moment in foot-kips, span in feet, and deflection in
inches, and for a steel beam (E = 29,000 ksi), it ends
up:

Delta = M * L^2 / 161 I

A few more:

Working stress design of E70 fillet welds, allowable
load = 0.928 kips/inch per 1/16 inch of weld size
(e.g. a 3/16 fillet is 3 x 0.928 kips/inch).

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

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

(Charlie, don't put this one in MSC)

TKDA
St. Paul, Minnesota

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