by Mike-SE » Sun Sep 15, 2013 6:43 pm
I'm back.
Units, Units, Units. Remember these three things.
w has units of lbs/ft (or kips per foot)
L normally has units of feet.
If you convert the L from feet to inches you must also convert the w to lbs/inch. A bunch of work and prone to errors.
The solution (the way I DO IT in the office
Use w in units of lbs/feet
Use L in units of feet, so L^4.
THEN multiply by 1728 (12^3)
so the equation becomes:
5*w*(L^4)*1728/384/29000/I
See the attached for how to see the "units" in the equation.
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