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Re: Proportional Limit, A36 Plate

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Gaylord and Gaylord (4th edition) suggests that Fp may be taken as 0.7Fy on
page 32-9 where they are discussing allowable streeses in steel stacks.

Neil Moore, S.E.
neil moore and associates
shingle springs, california

At 04:36 PM 5/15/2001 -0500, you wrote:
>Can I count on the *yield* for A36 plate being over 36ksi, or can I assume
>the proportional limit as equal to *yield*?  My only reference leads me to
>suspect that the proportional limit for steel could be as much as 10
>percent below yield.
>There's a reason for this exercise -- I'm checking a stack per ASME
>STS-1-1992 (the latest according to ASME website).  If the proportional
>limit is significantly less than yield, my allowable bending stress will be
>lessened substantially.
>From: Charlie Carter <carter(--nospam--at)>
>To: 'seaint(--nospam--at)'
>Subject: RE: Proportional Limit, A36 Plate
>Date: Tuesday, May 15, 2001 1:51 PM
>>Does anyone have a "ready" number for the proportional limit for A36
>>from 3/16" to 1/2" thick?
>Fy for ASTM A36 steel plate is 36 ksi up to and including a thickness of
>Above 8" thickness, it is reduced to 32 ksi.

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