CRITERIA FOR EVALUATING THE BEARING CAPACITY OF COMPRESSED-BENT ELEMENTS OF A RECONSTRUCTIBLE REINFORCED CONCRETE FRAME AT ACCIDENTAL IMPACT

Abstract

In accordance with SP 385.1325800, during the reconstruction of facilities of an increased and normal level of responsibility, their protection against progressive collapse should be ensured. However, studies devoted to the resistance of reconstructed structural systems subjected to sudden structural transformation are practically absent in the scientific literature. In connection with this the subject of research in this article is the resistance to the progressive collapse of the reinforced concrete frame of the reconstructed industrial building with reinforcing elements made of steel rolling profiles. It is shown that with a greater initial flexibility of compressed-bent elements, a scenario of exhaustion of the bearing capacity associated with a buckling is possible. In this regard, it is proposed to use a nonlinear calculation of the stability of the deformed states of the structural system as an additional tool in assessing the resistance of building frames and structures to progressive collapse.