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Section 2
2-7
2.3 Allowables per AISC Code
For steel design, STAAD compares the actual stresses with the
allowable stresses as defined by the American Institute of Steel
Construction (AISC) Code. The ninth edition of the AISC Code, as
published in 1989, is used as the basis of this design (except for
tension stress). Because of the size and complexity of the AISC
codes, it would not be practical to describe every aspect of the
steel design in this manual. Instead, a brief description of some of
the major allowable stresses are described herein.
2.3.1 Tension Stress
Allowable tensile stress on the net section is calculated as 0.60 Fy.
2.3.2 Shear Stress
Allowable shear stress on the gross section,
F
v
= 0.4F
y
2.3.3 Stress Due To Compression
Allowable compressive stress on the gross section of axially
loaded compression members is calculated based on the formula E-
1 in the AISC Code, when the largest effective slenderness ratio
(Kl/r) is less than C
c
. If Kl/r exceeds C
c
, allowable compressive
stress is decreased as per formula 1E2-2 of the Code.
CE
cy
= 2
2
π / F
2.3.4 Bending Stress
Allowable bending stress for tension and compression for a
symmetrical member loaded in the plane of its minor axis, as given
in Section 1.5.1.4 is: