STUDY OF SURVIVABILITY OF REINFORCED CONCRETE CONSTRUCTIVE NONLINEAR FRAME-ROD SYSTEM OF A MULTI-STORY BUILDING FRAME IN A DYNAMIC FORMULATION

Abstract

The article presents the results of numerical simulation of the dynamic response of a reinforced concrete frame of a multi-story building with the sudden removal of load-bearing columns using a detailed 3D model in the LS-DYNA program, whichimplements the explicit finite element method. The model takes into account the nonlinear behavior of the material. The influence of the deformation rate of concrete and steel reinforcement is taken into account using the coefficient of increasing the strength of materials, normalized in SP 385.1325800.2018. The numerical results of the study showed that using the proposed calculatedmodel, it is possible in each moment to track the stress-strain state of load-bearing elements of frame-rod system frame high-rise buildings, to check criteria special limit state designs, andto answer the important practical question of the sustainability of a building to progressive collapse under a givenbeyond design action and as a result take in the design of necessary protection measures.