Formulas: unsymmetric and other members subjected to flexure and axial force

Formula 1

Formula 2

Formula 3

$\left.\frac{f r a}{F_{c a}}+\frac{f r b y}{F_{c b y}}+\frac{f r b x}{F_{c b x}}\right) \leq 1.0$ at tee flange

Formula 4

$\left.\frac{f r a}{F_{c a}}+\frac{f_{r b x}}{F_{c b x}}\right\} \leq 1.0$ at tee stem

Equation C-H2-1

where

$F_{c b x}$ is the flange tension stress based on reaching $\phi F_{y}$ in the stem. There could be justification for using $F_{c b x}$ equal to $\phi F_{y}$ in this expression.

Equation C-H2-2

This interaction relationship would hold until the interaction between the flexural compressive stress at the stem with $F_{c b x}$ based on the local or lateral-torsional buckling limit, as increased by the axial tension, would control, resulting in the following interaction:

Found in

• UNSYMMETRIC AND OTHER MEMBERS SUBJECTED TO FLEXURE AND AXIAL FORCE