Page 315 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

Brockenbrough_Ch06.qxd 9/29/05 5:15 PM Page 6.37

DESIGN OF BUILDING MEMBERS

DESIGN OF BUILDING MEMBERS 6.37

Application of the magnification factors to the factored moments yields
M ux = 1.0(1.2 × 180 + 0.5 × 75 + 1.3 × 1050) = 1618 kip-ft
M uy = 1.0864(1.2 × 75 + 0.5 × 40) = 119.5 kip⋅ft
With P u /φP* n = 2202/4830 = 0.456 > 0.2, substitution of the preceding values in the interaction equa-
tion [Eq. (5.102)] yields

.
R = 0 456 + 8  1618 + 119.  5
9  3259 1628 
8
.
= 0 456. + ( 0 496 + 0 0734. ) = 0 96 1. <
9
This is the governing R value, and since it is less than unity, the column selected, W14 × 426, is
adequate.

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