Modelling of resistance to destruction of multi-storey frame-connected buildings at sudden loss of bearing elements stability

Authors modelled frame-bracing structural system resistance against progressive collapse at sudden buckling one of the compressed bearing elements of system in the paper. In the foundation of problem algorithmization it is put principle of initial structure dividing to substructures, combination of numerical and analytical methods at multistage calculation. Determination of critical force in compressed reinforced concrete elements of chosen substructure is carried out combining the initial parameters method and the displacement method. On the energy basis using works values at initial and end section it is evaluated nearby elements influence level on buckling of the most compressed rod. The numerical results of developed algorithm realization for substructure of reinforced concrete frame-bracing structural system of multi-storey building made of panel-frame elements are presented in the paper.