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Home > Forums > Engineering Codes, Standards & Certifications > Engineering Codes, Standards & Certifications > AISC (steel construction) Code Issues Forum

AISC 14 th Edition - Combined Member Capacities Limits

thread172-324472
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trac (Structural)
22 Jun 12 8:08
For combined member capacities the 14th Edition uses Eq H1-1a nd 1b but no limiting equation as per the 9th Edition i.e Eq H1-2. Checking some columns that have H1-1a < 1.0 but reviewing capacities based on combined stress gives a resultant stress exceding Yield. Structure is a no sway frame with beta1 = 0.6 and beta2 approx 0. Is this acceptable when using the LRFD 14th Edition.
JAE (Structural)
22 Jun 12 11:30
Read the commentary for section H1. There is a statement on page 16.1-332 that says, "...the cross section is assumed to be fully yielded in tension and compression."
trac (Structural)
25 Jun 12 4:46
Many thanks JAE - Thus for symmetric members you do not have to also design check using the 14th edition equation H2-1 where as in the 9th edition, use must use both equations H1-1 and H1-2
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