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자료유형
학술저널
저자정보
이창균 (Yonsei University) 이상정 (Yonsei University) 이은호 (Yonsei University) 임진우 (Yonsei University) 박노철 (Yonsei University)
저널정보
한국소음진동공학회 한국소음진동공학회논문집 한국소음진동공학회논문집 제31권 제2호(통권 259호)
발행연도
2021.4
수록면
151 - 160 (10page)
DOI
10.5050/KSNVE.2021.31.2.151

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초록· 키워드

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This study proposes a method for confirming the seismic integrity based on the strain of piping systems mainly used in power plants through finite element analysis. The piping system of power plants plays a vital role in connecting the major components of the system. Under earthquake conditions, strain is accumulated due to cyclic loads, and the critical location of strain accumulation due to fatigue failure is found to be the pipe elbows. To confirm the system response, it is necessary to extend the conventional finite element analysis model to the plastic domain and perform seismic transient analysis. Therefore, in this study, a method was proposed for performing an elasto-plastic analysis using the finite element analysis model based on the beam element used in the existing design evaluation. By applying the cross-sectional deformation effect in the elasto-plastic analysis to the existing beam element, the Fourier expansion number could be used to determine the sectional degree of freedom. Through case studies for various pipes, the feasibility of simulating the accumulated plastic strain and critical location using the proposed parameter setting was confirmed. Thereafter, the methodology was verified through application to the surge line geometry of a nuclear power plant. Consequently, using the proposed method, the finite element model containing the beam element with a deformable section effect could well simulate the critical location and determine the accumulated plastic strain value with a difference of 11 % in comparison with the solid element analysis result in the case study and a difference of 26 % in comparison with the surge line analysis result.

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ABSTRACT
1. 서론
2. 본론
3. 결론
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