Review article

The article presents theoretical substantiation of determining the reduced section under simultaneous action of the whole set of forces (including bimoment ones) in the sections of bar structural elements of structures made of cold-formed steel profiles. The substantiation includes using the «section» algorithm and the Eurocode provision concerning the section reduction of individual plates making up the bar. Reduced sections are replaced with non-reduced ones with additional loading of fictive forces compensating the reduction. An effective fast-acting (in the analytical form) method for determining the coefficients of local stability loss is proposed, which can be used for obtaining more reliable results of strength testing than by means of methods described in the valid regulatory literature.