Abstract
The results of modeling and computational analysis of the static-dynamic deformation of the reinforced concrete frame-and-rod system are presented for special emergency actions caused by the sudden removal of one of the supporting elements. On the basis of energy, without the apparatus of the dynamics of structures, analytical dependences are constructed to determine the increments of the dynamic extensions in the stretched armature and the dynamic strength of the reinforcement in the sections of the frame elements under the indicated effects on the first half-wave of the structure's oscillations. Verification of the proposed analytical dependencies is performed by comparing the theoretical values of the calculated parameters with the experimental data. It is shown that the constructed analytical dependencies allow to determine quite strictly the investigated dynamic parameters of deformation of the loaded reinforced concrete framed structural systems of buildings and structures under their dynamic overloading by special emergency action associated with sudden structural reorganization of the structural system.
Highlights
Protection of buildings and structures against progressive collapse requires their calculation in a static-dynamic setting
The purpose of this calculation is to determine the preloads of the structural system elements as a consequence of the sudden removal of one of the supporting structures
In this paper, analytical dependencies are constructed to determine the limiting time for dynamic reinforcement of working reinforcement in sections of reinforced concrete elements of a structural system caused by a sudden structural rearrangement in this system, and the results of modeling and calculation analysis of the deformation of the reinforced concrete frame-and-rod system, as well as the results of comparison with data from experimental studies
Summary
Protection of buildings and structures against progressive collapse requires their calculation in a static-dynamic setting. In scientific researches of domestic and foreign authors [1,2,3,4,5], software complexes for calculating structures and in normative documents of different countries [6,7,8,9], various proposals are given on the estimation of the time of impact of the changed power flow in the structure from the sudden removal of one or another design from constructions They are mostly staged in nature or in them, we will consider some particular solutions. In this paper, analytical dependencies are constructed to determine the limiting time for dynamic reinforcement of working reinforcement in sections of reinforced concrete elements of a structural system caused by a sudden structural rearrangement in this system, and the results of modeling and calculation analysis of the deformation of the reinforced concrete frame-and-rod system, as well as the results of comparison with data from experimental studies
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