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"mystery" formula from AISC spec ?

"mystery" formula from AISC spec ?

"mystery" formula from AISC spec ?

(OP)
Can someone identify this "mystery" formula purportedly from AISC for "unity" check? I was provided with this formula in some calculations; due to the context I assume they are referring to the combined load checks for beam-column. I can't identify this in the 9th or 13th Editions of the AISC "manual".

(Sma/Sa)+(0.85*S)/((1-Sma/Spex)*Sb)

RE: "mystery" formula from AISC spec ?

Because there are a lot of S in there I'm going to assume 9th edition. I don't recognize it but I'm not as familiar with the 9th edition so that would make sense if it is 9th.

Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com

RE: "mystery" formula from AISC spec ?

Looks a bit like H1-1 from 9th edition, but they are using Sma for fa, Sa for Fa, 0.85 is Cm, etc.

RE: "mystery" formula from AISC spec ?

(OP)
PMR06, I do believe that you're right.

Thank you!

(and thank you all for participating)

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