2021 Fiscal Year Final Research Report

Reconstruction of elasto-plastic theory considering quality assurance of seismic response analysis of large-scale structures

Research Project

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Project/Area Number	19K15073
Research Category	Grant-in-Aid for Early-Career Scientists
Allocation Type	Multi-year Fund
Review Section	Basic Section 22020:Structure engineering and earthquake engineering-related
Research Institution	防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群) (2021) Kagawa University (2019-2020)
Principal Investigator	Motoyama Hiroki 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群), システム工学群, 講師 (00732281)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	地震応答解析の品質保証 / 弾塑性理論 / 大規模コンクリート構造物
Outline of Final Research Achievements	Higher reliability is needed to seismic response analysis of important facilities such as nuclear power plants. Though applying FEM of high-fidelity model is often required, by imperfection of elasto-plastic theory, we have difficulty in quality assurance of the seismic response analysis. In order to solve the problem, I first reconstructed a new elast-plastic theory, which directly considers the area size suitable to target materials. In the second year, I constructed the nonlinear analysis method which is necessary to compute the theory. I also tried analysis of a large-scale model. In the third year, I constructed a modeling method of a boundary of materials which enable construction of whole structures. I also gave conference presentations about quality assurance of the computation.
Free Research Field	地震工学，応用力学
Academic Significance and Societal Importance of the Research Achievements	コンクリートや地盤などの軟化材料では、ひずみの局所化などの問題が発生するため、信頼性の高い計算が困難であった。この問題は、元の弾塑性理論に依存するもので、解析解を精度よく計算する詳細な有限要素法でより顕著になる。この問題の解決には、正しい理論の構築という学術的な意義がある。また、詳細な有限要素法の適用が望まれる大規模重要施設での地震応答解析の品質保証が可能になるため、信頼性の高い安全性評価に資する技術であり、社会的な意義もある。