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Report No.

Wave propagation properties of frame structures; Formulation for three-dimensional frame structures

Nishida, Akemi  

Since it is generally difficult to predict the occurrence of natural disasters such as earthquakes, a performance management system that always maintains the safety and functionalities of structures is required, especially for critical ones like nuclear power plants. In order to realize such a system, it is becoming important to carry out modeling procedures and analyses in detail to better understand the real phenomena. The aim of our research is to solve the dynamic behavior, especially the wave propagation phenomena, of piping systems in nuclear power plants which are complicated assemblages of parts. The spectral element method is adopted in this work and the formulation considering a shear deformation independently for a frame element is described. The Timoshenko beam theory is introduced for the purpose of this formulation. Moreover, the validity of the presented element will be described through comparisons made with the conventional beam element by showing the numerical example using the steel pipe actually used as the piping in HTTR, JAEA.



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