Steel - Nominal Moment Capacity and

Lateral Torsional Buckling, \(\phi M_{n} \quad (C_b=1)\)

	User Input			Calculated Output - LTB
\(F_{y}=\)		ksi	\( \quad \phi M_{n}=\)		k-ft
\(E=\)		ksi	\( \quad M_{n}=\)		k-ft
\(shape=\)			\( \quad L_{p}=\)		ft
\(L_b=\)		\(ft\)	\( \quad L_{r}=\)		ft
			\( \quad \phi M_{p}=\)		k-ft
Allowed =>	W, S, C Shapes		\( \quad \phi M_{r}=\)		k-ft
			\(\quad Z_x=\)		\(in^3\)
Output =>	Flange Local Buckling		\(\quad S_x=\)		\(in^3\)
\(\phi M_{n,FLB}=\)		k-ft	\(\quad r_y=\)		\(in\)
			\(\quad r_{ts}=\)		\(in\)
			\(\quad c=\)
			\(\quad h_o=\)		\(in\)
			\(\quad J=\)		\(in^4\)
			\(\quad I_y=\)		\(in^4\)
			\(\quad C_w=\)		\(in^6\)
			\(\quad \frac{bf}{2t_f}=\)

Calculations Based on AISC Manual 16th Edition (Use smaller of LTB & FLB)