The master thesis at hand addresses a rather academic example of static structural mechanics. Both linear deformation and stability analysis of a circularly curved rod in space with an open, thin-walled cross section (devided circle) are performed in the framework of a special beam theory, presented in . The numerical calculations within the geometrically linearised setting provide a solid foundation for the subsequent stability analysis. The incremental formulation, introduced in , as well as the global Ritz-method are applied to study the torsional-flexural buckling of the structure. The incremental theory produces accurate results for the critical forces in comparison to shell-finite-element computations at less cost than the Ritz-method. The post-buckling analysis performed with the global Ritz-method and accompanied by shell-finite-element calculations concludes the numerical investigations.