Strength and stability of metal frame at different stages of steel performance

The object of the study is the strength and stability of the metal frame during linear and nonlinear steel operation according to a bilinear diagram under static loading. Purpose: The analysis of the metal frame strength using the structural strength factor in the linear calculation and the load-bearing capacity use factor in theoretical calculation of the limit element surface as well as the linear and nonlinear stability based on the concept of the system limit repulsion. Methodology : The computational substantiation of the bearing capacity and stability of the reinforced concrete frame at different stages of materials performance, is carried out in the Ing+2021 MicroFe program with the proposed finite element spatial model. Research findings : At the structural strength and bearing capacity of the metal frame and its linear stability, the critical parameter at physically nonlinear stability is less than the standardized value, as a result of which the metal frame stability is not fulfilled for ultimate limit state.