Joint Effect of the Nonlinearity of Elastic Foundations and the Variation of the Inertia Ratio on Buckling Behavior of Prismatic and Nonprismatic Columns Using a GDQ Method

Table 6

Effects of elastic foundation parameters on the nondimensional critical buckling loads for nonuniform columns with linearly varying stiffness distributions .

Boundary conditions	Buckling load
	Present proposed technique (N = 15)			Present proposed technique (N = 15)			Present proposed technique (N = 15)			Present proposed technique (N = 15)
	Elastic foundation parameters			Elastic foundation parameters			Elastic foundation parameters			Elastic foundation parameters
	K1	K2	K3	K1	K2	K3	K1	K2	K3	K1	K2	K3
	0.0	0.0	0.0	30	0.0	0.0	30	30	0.0	30	30	30
Simple-simple	14.5112			17.5346			47.5346			50.1784
Clamped-clamped	57.3940			59.6607			89.6607			92.6179
Clamped-simple	29.4490			32.0561			62.0561			65.2047