Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Nakajima, Norihiro; Nishida, Akemi; Kawakami, Yoshiaki; Tsuruta, Osamu; Suzuki, Yoshio
no journal, ,
Japan Atomic Energy Agency has been developing the three-dimensional virtual shaking table for earthquake-resistant evaluations in the atomic energy facilities. It is to realize an earthquake proofing reliability examination by analyzing the earthquake-resistant of the large structure on a computer. This is the trial that is going to realize a virtual shaking table examination such as difficult size of the original structures or nuclear power generation facilities while driving on a computer. Authors develop the structure analysis cord of the assembling structure so called FIESTA (Finite Element Structural Analysis for Assembly) as one of the core functions. This is the details analytical method that paid its attention to the behavior between the part of the assembling structure as one means to perform the earthquake-resistant evaluations for such as atomic energy facilities. In this report, it is reported the way of time history response analysis by assembly structural analysis.
Nakajima, Norihiro; Nishida, Akemi; Kawakami, Yoshiaki; Suzuki, Yoshio
no journal, ,
Quality Assurance is an issue for computational science and engineering. It is well discussed in verification and validation for Simulation. In finite element analysis, it is a problem whether the finite element discretization is appropriate or not. Also, algorithmic choice prepared variously by the recent R&D discipline that become the problem which one to take. An experiment was performed for the static analysis and natural frequency analysis to confirm how uncertainty is revealed. As a result, by means to compare accuracy of the calculation precision that utilized a parallel environment, the numerical experiment reconfirmed that the estimate of the calculation solution was possible.
Nakajima, Norihiro; Nishida, Akemi; Kawakami, Yoshiaki; Suzuki, Yoshio
no journal, ,
Facilities in nuclear industry are known as large structures consisting of components more than 10 million. A method to analyze an assembly by gathering its components data has been introduced. This paper discusses how to understand certainty in results of assembly structural analysis. Numerical results are discussed with K, computer.
Guo, Z.; Nishida, Akemi; Nakajima, Norihiro
no journal, ,
Seismic estimation for huge plants including nuclear power facilities after the 2011 Tohoku Earthquake becomes more important. As usual, the joints connected different parts of structure have been often treated as boundary conditions based on a simple assumption in modeling of huge structures such as plants. However, the actual connections are complicated, so the stresses exceeding the designed value may occur sometimes. Therefore it is extremely important to investigate local stress distributions in detail for confirming the validity of design, and then if the situations unexpected in the design are found, it is necessary to modify the design. Our objective in the present study is to clarify modelling issues through comparisons of results from different modeling approaches and to propose a solution for the modelling issue. In this work, we apply different modelling approaches to a real plant structure, and analyze differences in their mechanical behaviors.