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# Re: phi in both sides of formula 14-1

• To: <seaint(--nospam--at)seaint.org>
• Subject: Re: phi in both sides of formula 14-1
• From: "Gary Hodgson & Associates" <ghodgson(--nospam--at)bellnet.ca>
• Date: Fri, 31 Mar 2006 07:59:11 -0500
• Priority: normal

```I have never liked that usage but since it does't
Here (where Wyoming looks balmy, David),the left hand
side of our equations uses M(Sub)r, V(Sub)r, etc,
indicating the resistance of the member.  I much prefer
ours but it really is a matter of what you are used to.
I could see someone like Eugenio making the assumption
that it is part of an algebraic equation, as that was
the same  assumption I made when I first saw a US code
with that content.
Gary

On 30 Mar 2006 at 13:43, Paul Feather wrote:

> Yes Dave, I will admit to the same off-beat comedic reaction.
>
> On the other hand, to answer the man's question:
>
> Eugenio,
>
> The design expression is not straight algebra the way you are thinking of it.  The phiPnw is the name of the variable you are trying to find, if this makes sense.  The axial load strength, Pnw,  would be 14-1 without "phi", the design axial load strength is "phi" times the axial load strength.  Since phi is in the right side of the equation, the nomenclature is phi-Pnw on the left so you know phi has been applied.  It would not cancel out algebraically.
>
> Paul Feather PE, SE
> www.SE-Solutions.net
> pfeather(--nospam--at)SE-Solutions.net
>   ----- Original Message -----
>   From: David Maynard
>   To: seaint(--nospam--at)seaint.org
>   Sent: Thursday, March 30, 2006 12:08 PM
>   Subject: RE: phi in both sides of formula 14-1
>
>
>   Eugenio wrote:
>
>   "I am confused with the formula (14-1) "Design axial load strength" which sowns a factor "phi" at the two sides of the formula.     In the 2001 California Building Code.
>
>   My recollection in algebra says that a value goes to the other side of the formula with the oppossite sign. If I follow the rule, "phi" multiplying goes dividing, means phi/phi=1.
>
>   Why in such Chapter 19, DIVII - 1914.5.1 even it gives a value of 0.70 to phi?.
>
>
>
>   I will appreciate your comments, specially because I am an architect."
>
>
>
>   In response:
>
>   I think the last statement just about sums up the root of the problem right there.
>
>
>
>   *laugh*  Sorry, I couldn't resist.  *laugh*  Just havin' some fun.  I'm in a goofy kinda mood today.
>
>
>
>   But come on. how many Engineers out there read that statement and thought the exact same thing.  I know you're out there.  You know who you are!!!
>
>
>
>   Comedy by:
>
>   Dave Maynard, PE
>
>   Gillette, Wyoming
>
>
>
>   P.S. The wind's blowing like crazy today.  I'm starting to get cabin fever.
>
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