Formulas: Material Properties at Elevated Temperatures

Formula 1

F_{u}(T)=1.25 F_{y}

F_{u}(T)=F_{y}(T)

(a) When $0.02<\varepsilon(T) \leq 0.04$

0.02<\varepsilon(T) \leq 0.04

F(T)=\left[\frac{F_{u}(T)-F_{y}(T)}{0.02}\right] \epsilon(T)-F_{u}(T)+2 F_{y}(T)

$\epsilon_y(T = 2\%$ (vertical_reference_line - position: x = $2\%$ ))

\epsilon_y(T = 2\%

(b) When $0.04<\varepsilon(T) \leq 0.15$

0.04<\varepsilon(T) \leq 0.15

F(T)=F_{u}(T)

0.15<\varepsilon(T)<0.20

F(T)=F_{u}(T)\left[1-\frac{\varepsilon(T)-0.15}{0.05}\right]

(d) When $\varepsilon(T) \geq 0.20$

\varepsilon(T) \geq 0.20

$T \le 212^{\circ}F (100^{\circ}C$ — color: black; symbol: Solid line

T \le 212^{\circ}F (100^{\circ}C

$T \le 572^{\circ}F (300^{\circ}C$ — color: black; symbol: Dashed line

T \le 572^{\circ}F (300^{\circ}C