Запредельные напряженно-деформированные состояния в поперечных сечениях элементов стальных конструкций

Abstract

The article proposes using a technique of calculation the post-limit (residual) bearing capacity of steel frame elements relating to the strength check, in general case of loading, taking into consideration the post-critical behavior of plates making up the frame element and large plastic strain overflowing into the self-hardening stage. The solution is made by the “reverse” method in dimensionless parameters with increments of the strain of the most stressed fiber, which allows reducing by orders of magnitude the calculation time compared to existing methods. Herewith, the results of post-critical resistance of plates were used, which were obtained considering geometric imperfections and initial stresses under deformations in the form of limit relative slenderness of working parts of plates, that were approximated in form of functions for convenience and extrapolated to the values . The graphs showing how the bearing capacity reduction coefficient depends on the value of the normalized strain of the most stressed fiber for some of the cross-sections most widely used in construction practice are presented.