Investigation of the reserves of the bearing capacity of the elements of the metal frame in buildings experiencing compression with biaxial loading eccentricities.

The article is devoted to the research of reserves of bearing capacity of elements of metal frames of buildings experiencing compression with biaxial eccentricity. The non-centrally compressed elements of the metal frame are able to retain part of the load-bearing capacity under the short-term action of loads exceeding critical values. The supercritical bearing capacity of such elements has a significant impact on the stability of the frame. Additional studies of the effect of plastic deformations on the behavior of metal structures are presented, leading to improved calculation methods for identifying load-bearing capacity reserves.The object of the study is the improvement and correction of the engineering calculation method for the stability of rods of channel section compressed with biaxial eccentricity.Solutions have been proposed to update regulatory technical and methodological documents, in particular, when preparing amendments to the code of rules of SP 294.1325800.2017 “Steel structures. Design rules”.