The results of experimental investigation of critical states of thin-walled open structures with different stiffeners, subjected to constrained torsion are presented in the paper. The tests were executed on the special steel models which complied with assumptions relative to stiffeners and boundary conditions. The purpose of the investigation was in order to obtain an information about buckling form of the structure and influence of kind of stringers (stiffeners) on the level of critical loads. Received results constituted the base to formulate very interesting conclusions, important from practical point of view.
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