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Re: W14x22 Moment of Inertia

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I didn't mean for it to be funny.  I was serious.  This is a means of 
providing evidence for copyright infringement, not a consideration of being 
conservative or non-conservative.  The difference in moments of inertia, 
approximately 2/200 or 1%, is insignificant compared to the variations of all 
the other assumptions that are made in design.

While it wasn't done on purpose, I was able to use the difference in a print 
made on a tabletop blueprint machine (tight radius around a single 
fluorescent tube) and the original as evidence that a drawing was a direct 
copy of the print (exact same difference).

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

Keith Fix wrote:

. > Roger-

. > While that's very funny, one value or the other should be correct, and the
. > error does not improve my confidence in the manual.

. > At one point, someone told me the economy tables at the back of Vulcraft's
. > joist catalog were unconservative.  I avoided the table for three years
. > thereafter until I could satisfy myself that the tables were acceptable.

. > If someone has a definitive answer, I'd appreciate it.

. > -Keith Fix, PE

. > --- Roger Turk <73527.1356(--nospam--at)> wrote:
> This is one of the ways organizations use to detect copyright infringement 
> --- make small insignificant errors and see if the same "errors" crop up in 
> someone else's work.
> Neither is "wrong."  Both will give you the same answer to 3 significant 
> digits (slide rule accuracy) and sections rolled by any particular mill may 
> have one or the other values or another value altogether.  (Now, if it was 
> off by a factor of 10, it would be a little more of a concern.)
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
> Keith Fix wrote:
> . > LRFD 3rd Ed. lists I=199 in4 for W14x22 in the properties section, 
> . > however; in the beam selection tables, I=197 in4 for W14x22. Which is
> . > correct value?
> . > Refer to pages 1-21, 5-41, & 5-48.

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