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Study on design of composite ground with existing piles to enable shallow foundation buildings with high seismic performance

Research Project

Project/Area Number 20H02306
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 23010:Building structures and materials-related
Research InstitutionOsaka University

Principal Investigator

Kashiwa Hisatoshi  大阪大学, 大学院工学研究科, 教授 (40550132)

Co-Investigator(Kenkyū-buntansha) 石原 直  東京工業大学, 科学技術創成研究院, 教授 (50370747)
中川 博人  国立研究開発法人建築研究所, 国際地震工学センター, 主任研究員 (80713007)
大村 早紀  国立研究開発法人建築研究所, 構造研究グループ, 研究員 (70848283)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2023: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2022: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2020: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Keywords既存杭の利活用 / 基礎構造 / 地盤工学 / 振動台実験 / 有限要素解析 / 建築構造 / 既存杭 / 耐震設計 / 動的相互作用 / 直接基礎
Outline of Research at the Start

都市の再生の機運が高まっている中において、建物の建替えを計画する際には既存杭の処理が大きな問題となる。しかし、既存杭を有用物として捉えて再利用することができれば、環境負荷の問題に対して多大な貢献が可能となる。本研究では、既存杭を活用した巨大地震に対して強靭な建築システムを構築し、環境負荷の軽減と建物の強靭化を両立させる新機構の確立を目指して、既存杭と地盤の両方が安定的な支持力を発揮できる複合地盤の設計法を示すとともに、複合地盤上の建物の巨大地震に対するレジリエンスの評価手法を提案する。

Outline of Final Research Achievements

Centrifugal shaking table tests and shaking table tests in 1G were conducted to study design methods for composite ground with existing piles and evaluation methods for the seismic behavior of buildings on the composite ground, with the following results.
First, the influence of torsional vibrations associated with the stiffness eccentricity of the foundation on the seismic response of the superstructure, which appears when adopting a pile foundation with existing piles, was ascertained. Next, shake table tests were conducted to investigate the seismic behavior of insulated pile foundations, which separate the pile head from the footing. The tests indicated that the piles in the ground reduce building inclination due to earthquakes. Furthermore, it was shown that a three-dimensional non-linear finite element method could be applied to develop an analytical model for estimating experimental results.

Academic Significance and Societal Importance of the Research Achievements

本研究で実施した各種模型実験および解析的検討により、既存杭を利用する上での課題の具体を明らかにするとともに、既存杭の新しい活用法に関する有用な知見を得ることができた。得られた知見は既存杭を利用した地盤改良併用基礎の設計法を構築するための基盤となるもので、既存杭の利用促進に資するものであり、災害レジリエンスの向上だけでなく、建築業の環境負荷低減に貢献することができる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (11 results)

All 2024 2023 2022 2020

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] EFFECT OF STIFFNESS ECCENTRICITY OF SWAY SPRINGS ON SEISMIC TORSIONAL RESPONSE OF BUILDINGS2024

    • Author(s)
      ISHIHARA Tadashi、KASHIWA Hisatoshi、KIKITSU Hitomitsu、INOUE Namihiko
    • Journal Title

      AIJ Journal of Technology and Design

      Volume: 30 Issue: 74 Pages: 53-58

    • DOI

      10.3130/aijt.30.53

    • ISSN
      1341-9463, 1881-8188
    • Year and Date
      2024-02-20
    • Related Report
      2023 Annual Research Report
  • [Journal Article] Shaking Table Test of Insulated Pile Foundation for Effective Utilization of Existing Pile2020

    • Author(s)
      Kashiwa, H., S. Ohmura, H. Nakagawa and S. Nakai
    • Journal Title

      Proc. 17th World Conf. on Earthq. Eng.

      Volume: Paper No. 4c-0047

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Influence of Weight of Shear Box on Soil Structure System in Centrifuge Model Test2024

    • Author(s)
      Nakagawa, H.
    • Organizer
      18th World Conf. on Earthq. Eng.
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 地盤の非線形性を考慮したロッキング振動を伴う構造物の簡易な応答解析手法の検証2023

    • Author(s)
      中川博人
    • Organizer
      第16回日本地震工学シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 改良地盤の併用による既存杭の活用工法の検討2023

    • Author(s)
      庄田陽香
    • Organizer
      日本建築学会近畿支部研究報告会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 杭頭絶縁基礎における改良地盤の活用方法の検討2023

    • Author(s)
      庄田陽香
    • Organizer
      日本建築学会大会(近畿)
    • Related Report
      2023 Annual Research Report
  • [Presentation] Applicability of a Simple Constitutive Model for Three-Dimensional Finite Element Analysis on Dynamic Soil-Structure Interaction Problem2022

    • Author(s)
      Nakagawa, H
    • Organizer
      3rd European Conf. on Earthq. Eng. & Seism.
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of Weight of Shear Box on Dynamic Soil Response in Centrifuge Model Test2022

    • Author(s)
      Nakagawa, H
    • Organizer
      8th Asia Conf. on Earthq. Eng.
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 遠心振動実験による杭頭絶縁基礎建物の地震応答性状2022

    • Author(s)
      柏尚稔
    • Organizer
      日本建築学会近畿支部研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 重力場振動台実験による杭頭絶縁基礎建物の地震応答性状 (その1)実験方法と実験結果の概要2020

    • Author(s)
      大村早紀
    • Organizer
      日本建築学会学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 重力場振動台実験による杭頭絶縁基礎建物の地震応答性状 (その2)建物模型の地震応答性状と杭-地盤系の支持機構2020

    • Author(s)
      柏尚稔
    • Organizer
      日本建築学会学術講演会
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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