THE FEATURES OF DEFORMATION OF SHELL-TYPE STRUCTURES UNDER CONDITIONS OF DYNAMIC LOADING

Abstract

The article is devoted to the large-velocity shell designs, the main supporting element of which is thin-walled cold-deformed arched metal profile, which is manufactured directly on the construction site. The peculiarities of the technology of carrying out construction works during the installation of these structures are analyzed, and features and problems of the use of these structures in the territory of Ukraine, USA and the European Union countries are considered.The object of the research is a fragment of the specified special shell system.The purpose of the research is to construct a finite-element model of the research object, as well as refine, on the basis of this model, the existing methods of calculating the considered structures. Also, the goal of the study is to determine the frequency of own and forced fluctuations of the object of research, numerically and experimentally, and verification of the finite-element model, by conducting a full-scale experiment.The algorithm of finite-element modeling of the research object is considered, and the boundary conditions of the calculation scheme are considered.The analysis of the strained-deformed state of the shell-type structure from the dynamic effect of the wind is carried out, as the core in which these cold-deformed thin-walled profiles are used. The research was carried out on the basis of a compiled finite element model that implements the properties of a special-purpose shell. On the basis of the performed calculations, the analysis of the stress-strain state and the amplitude-frequency (frequency and shape of the proper oscillations) of the characteristics of the shell structure have been carried out. The calculation model was verified on the basis of a full-scale experiment, during which a load was applied to the considered full-size fragment of the shell-type system and measurements of amplitude-frequency characteristics were made by two-channel vibration analyzer "ONIKS". The enumerated in the aggregate predetermined the introduction of the system through the design of a number of erected objects.