J.B. Johnson Formula
	• Euler formula is not valid for Inelastic buckling • J.B. Johnson formula is valid for inelastic buckling – Parabola that connects Eulers Formula line to the short column • Figure 19-5 – Slenderness ratio, Cc is one-half yield strength of steel, 36ksi, • Example, Cc = 18 ksi – J.B. Johnson Formula is then – J.B. Johnson only applies to ductile steel – Euler applies to all materials – Example 19-3
			Slenderness Ratio