Dynamic coupling simulation technique of buildings and ground for practical design by finite element mesh superposition method

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K12009
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 60100:Computational science-related
• Research Institution: Wakayama National College of Technology
• Principal Investigator: Sando Atsushi 和歌山工業高等専門学校, 知能機械工学科, 准教授 (50435442)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 重合メッシュ法 / 不整合メッシュ / 固有値解析 / 時刻歴応答解析

Outline of Final Research Achievements

In the development of integrated models of a building structure and the ground, a modeling method that does not require consideration of mesh connectivity is useful because the mesh resolutions of the two differ greatly. Furthermore, since the boundary between the building structure and the ground is the most important in the structural design in coupled analysis, it is desired to improve the accuracy near the boundary.
In this study, we propose efficient modeling of an integrated model of building structure and ground using the s-version finite element mesh superposition method with mesh protrusions. It was confirmed that simple modeling can be used in static analysis, eigenvalue analysis, and time history response analysis to obtain analysis results that are in good agreement with the FEM reference solution. Furthermore, the relationship between modeling and analysis accuracy was clarified by a parametric study.

Free Research Field

計算力学

Academic Significance and Societal Importance of the Research Achievements

原子力建屋などの特殊な建築構造物の設計では詳細な地震応答の把握が必要であることから，質点を用いた簡易モデルでなく構造物とその周辺地盤も含めた一体モデルを用いたFEM解析が求められている．一体モデルで効率的なメッシュ分割を目指せば，メッシュの分解能が大きく変わりモデル化が困難となる箇所が生じる．本研究成果は不整合メッシュを用いることができるためメッシュ作成や部分修正の労力を大幅に削減し，さらに高い解析精度が必要となる境目付近だけを微細メッシュにできる優位点がある．本提案手法が汎用化できれば，多点拘束法と併用してFEMが苦手とするモデリングを容易に実現できる代替手法となることが期待できる．