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Re: Interpolation

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An option to interpolation is to use the "Trial and Error Method" using the
following standard formulas rearranged for a and As:
a = As*fy/(.85*f'c*b) and As = Mu/(phi*fy*(d-a/2), where your knows are the
material strengths, factored moment, b and d.  Assume a value of "a" solve
for As, plug As into the formula for "a" and solve for "a".  Repeat process
until "a" value remains constant, usually you only need 3 iterations for "a"
to agree.  This "Trial and Error Method" can easily be set up in a
spreadsheet and only takes a few seconds to determine your required minimum
reinforcement for flexure.

HTH
Vance Grover, P.E. (Structural)
MPLS, MN

----- Original Message -----
From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, June 08, 2001 8:01 AM
Subject: Interpolation


> Ken,
>
> I am not sure what you are asking.  What are you trying to "interpolate?"
Is
> it a particular table, for flexure, compression, combination, or what?
>
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
>
> Ken Kirkland wrote:
>
> . >   I forgot how to do the interpolate to determine "p" and required
> . > reinforcement in concrete.  Can some one please show me.
> . > Thanks in advance.
>
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