Abstract
The seismic resistance of nuclear power plants equipment and piping is determined, inter alia, by the seismic resistance of their steel supporting structures. The linear-spectral method, which involves using the results of the modal analysis of the structure under consideration, is widely used to assess the seismic resistance of these supporting structures. During the modal analysis, the structure’s dynamic characteristics are researched (in particular, the modes and values of natural oscillation frequencies). The dynamic characteristics of steel supporting structures affect the number of seismic loads that will be transmitted to them during an earthquake. The value of dynamic characteristics, among other issues, is influenced by the conditions of the steel supporting structures fastening. Therefore, it is relevant to research the impact of changes in the conditions of fastening of steel supporting structures of nuclear power plant equipment and piping on their seismic resistance. The paper gives the results of the research of dynamic characteristics, as well as the stress-strain state of steel supporting structures of nuclear power plant equipment and piping during changes in the conditions of their fastening
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