Double-ended failure of piping due to earthquake

(Failure of strait pipe due to collapse or deformation)

Abstract

Plastic collapse or excessive deformation of a pipe causes double-ended failure of the pipe, that is, guillotine break, which causes a large leakage of the internal fluid. In this paper, based on the results of inelastic analysis of straight pipes, the limit of ductility factor that do not lead to plastic collapse or excessive deformation of straight pipes is clarified. Next, the relationship between yield strength and deformation of straight pipes due to seismic forces is clarified on the constant-ductility response spectra, and it indicates that double-ended failure of straight pipes is not occurred even under excessive seismic forces at nuclear power plants in Japan.