Coupled dynamic buckling of thin-walled composite columns with open cross-sections

In this paper an analysis of dynamic response of thin-walled composite columns with opened stiffened cross-sections was described. The columns were subjected to an in–plane pulse loading and three different stability criteria were applied: the Budiansky–Hutchinson, the Kleiber–Kotula–Saran and the phase-plane one. A pulse loading of rectangular shape was concerned. The columns were assumed to be simply supported at the ends. Additionally, an attention was paid to an influence of the tracking time of dynamic response on critical values of dynamic load factors. A plate model was adopted in the analysis. Differential equations of motion were obtained from the Hamilton’s Principle, taking into account all components of inertia forces. The discussed problem of dynamic buckling was solved with a numeric method. Special attention was given to a coupled buckling of various global buckling modes.