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Okuda, Takahiro; Takahashi, Hideki*; Watakabe, Tomoyoshi
Mechanical Engineering Journal (Internet), 10(4), p.23-00075_1 - 23-00075_9, 2023/08
In recent years, to make the seismic design more rational for the piping systems in nuclear power plants, it has been expected to develop a design method considering plastic deformation and the accompanying energy dissipation of the piping itself. In this study, an extensive series of seismic response analyses was conducted to investigate the degree of influence of the plastic deformation of the pipe support structures on the seismic response of the entire piping system. The analyses include; plasticity is considered for (1) none, (2) the piping only, (3) the support structure only, and (4) both the piping and the support structure.
Okuda, Takahiro; Watakabe, Tomoyoshi; Morishita, Masaki; Takahashi, Hideki*
no journal, ,
This paper describes the results of a series of seismic analyses conducted to clarify how plastic deformation of a pipe and its support structures affect the seismic response of the entire piping system. The first analyses include; plasticity is considered for (1) none, (2) the piping only, (3) the support structure only and (4) both the piping and the support structure. The second analyses are parametric survey of yield load and post yield stiffness of the restoring force characteristics of support structures. The results of the first analyses have revealed important implications on the seismic design of piping systems by elastic-plastic response analysis.
Okuda, Takahiro; Watakabe, Tomoyoshi; Morishita, Masaki; Abe, Kenji*
no journal, ,
This paper describes the results of a series of seismic analyses to clarify how the plastic deformation of some support structures affects the seismic response of the entire piping system. The results of these analyses have revealed important implications for the seismic design of piping systems by elastic-plastic response analysis. First, regarding the order of the support structure considering plasticity, it is more effective to give priority to the plastic characteristics of the support structure showing a large load in the linear response analysis. Second, partially considering plasticity is more effective in reducing the burden of the entire design work than considering the plasticity of the entire support structure.
