290

(tubes)

(others)

(w/lacing)

VF y 1365

vF y 665

197pk 8950

2:33

n = number of equally spaced longitudinal compression flange stiffeners.

Is = moment of inertia of a longitudinal stiffener about an axis parallel to the bottom flange and taken at the base of the stiffener. Notes:

1. Width-thickness ratios shown in Bold are from AISC-LRFD (1999) [67] and AlSC-Seismic Provisions (1997) [68]. Fy is MPa.

2. k = buckling coefficient specified by Article 6.11.2.1.3a of AASHTO-LRFD [38]. For n = 1, k =(8Is/bf3)173 < 4.0; for n = 2, 3, 4, and 5, k = (14.3Is/bfV)1/3 < 4.0

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