Formulas: Stiffened Elements

Formula 1

[b] $F_{L}=0.7 F_{y}$ for slender web I-shaped members and major-axis bending of compact and noncompact web built-up I-shaped members with $S_{x t} / S_{x c} \geq 0.7$; and $F_{L}=F_{y} S_{x t} / S_{x c} \geq 0.5 F_{y}$ for major-axis bending of compact and noncompact web built-up I-shaped members with

Formula 2

[b] $F_{L}=0.7 F_{y}$ for slender web I-shaped members and major-axis bending of compact and noncompact web built-up I-shaped members with $S_{x t} / S_{x c} \geq 0.7$; and $F_{L}=F_{y} S_{x t} / S_{x c} \geq 0.5 F_{y}$ for major-axis bending of compact and noncompact web built-up I-shaped members with $S_{x t} / S_{x c}<0.7$, where $S_{x c}, S_{x t}=$ elastic section modulus referred to compression and tension flanges, respectively, in

Formula 3

[b] $F_{L}=0.7 F_{y}$ for slender web I-shaped members and major-axis bending of compact and noncompact web built-up I-shaped members with $S_{x t} / S_{x c} \geq 0.7$; and $F_{L}=F_{y} S_{x t} / S_{x c} \geq 0.5 F_{y}$ for major-axis bending of compact and noncompact web built-up I-shaped members with $S_{x t} / S_{x c}<0.7$, where $S_{x c}, S_{x t}=$ elastic section modulus referred to compression and tension flanges, respectively, in ${ }^{3}\left(\mathrm{~mm}^{3}\right)$

Formula 4

$F_{L}=0.7 F_{y}$ for slender web I-shaped members and major-axis bending of compact and noncompact web built-up I-shaped members with $S_{x t} / S_{x c} \geq 0.7$; and $F_{L}=F_{y} S_{x t} / S_{x c} \geq 0.5 F_{y}$ for major-axis bending of compact and noncompact web built-up I-shaped members with $S_{x t} / S_{x c}<0.7$, where $S_{x c}, S_{x t}=$ elastic section modulus referred to compression and tension flanges, respectively, in ${ }^{3}\left(\mathrm{~mm}^{3}\right)$

Formula 5

(N-mm); $M_{p}=F_{y} Z_{x}$, plastic moment, kip-in.

Found in

• MEMBER PROPERTIES