The article is devoted to the evaluation of the torsional stiffness of the beam junction. The influence of the connection on the bearing capacity and stability of the construction of a thin-walled rack is analyzed. As an example, we consider models of beams with a length of 1.5 m. Torsional stiffness values for a beam-stanchion connection under extreme loads are obtained. Results of full-scale tests will be compared with the results of electronic calculations made in a specialized software package.