Coupled stability analysis of thin-walled composite beams with closed cross-section

摘要: Abstract For the coupled stability analysis of thin-walled composite beam with closed cross-section subjected to various forces such as eccentric constant axial force, end moments, and linearly varying efficient numerical method evaluate element stiffness matrix is newly presented based on homogeneous form simultaneous ordinary differential equations. The general bifurcation type buckling theory for box developed energy functional corresponding semitangential rotations moments. equations including variable coefficients force–displacement relationships are derived from principle explicit expressions displacement functions power series expansions components. evaluated by applying member these functions. In addition, finite model cubic Hermitian interpolation polynomial presented. order verify accuracy validity this study, solutions compared using elements available results other researchers. Particularly, influence eccentricity force ratio forces, fiber orientation, boundary conditions behavior parametrically investigated. Also emphasis given in showing phenomenon mode change.