2021 Fiscal Year Final Research Report
Evaluation of Seismic Response of Structure Supported by Piles in Soft Cohesive Soil Subjected to Large Earthquake
Project/Area Number |
19K15138
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 23010:Building structures and materials-related
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Research Institution | Osaka University |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 地盤-構造物の非線形相互作用 / 杭基礎 / 粘土地盤 / 群杭効果 / 杭周地盤ばね / 模型振動台実験 / 有限要素法 |
Outline of Final Research Achievements |
Experimental and analytical studies were conducted to investigate seismic response and nonlinear characteristics of pile-soil springs for structures supported by piles in cohesive soil. The results of a shaking table test demonstrated that nonlinear behavior of soil influenced seismic response of a superstructure and of piles. Three-dimensional finite element (3D FE) models for evaluating pile stress were constructed by comparing analytical results and data of a shaking table test in granular soil and an in-situ loading test in cohesive soil. According to an analytical study using 3D FE models, it is found that pile-soil springs of cohesive soil had different characteristics from those of granular soil.
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Free Research Field |
建築構造
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Academic Significance and Societal Importance of the Research Achievements |
粘土地盤中の杭支持構造物を対象とした振動台実験の例は少なく、本研究課題で行った実験によって貴重なデータが得られた。三次元有限要素法による杭応力評価モデルの構築については、砂および粘土地盤のそれぞれで進展が見られ、今後の解析的研究の足掛かりとなると考えられる。また、代表的な杭配置をもつ群杭と単杭について杭周地盤ばねの履歴特性をまとめたことで、粘土地盤中の杭周地盤ばねをモデル化するための基礎的な知見を得ることができた。本研究課題の成果は、大地震に対する杭の応答評価法の高度化するための資料となることが期待できる。
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