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Vehicle passage risk due to progressive destruction of abutment approach under multi consecutive strong motions

Research Project

Project/Area Number 18K04332
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionKanto Gakuin University

Principal Investigator

Kitahara Takeshi  関東学院大学, 理工学部, 教授 (00331992)

Co-Investigator(Kenkyū-buntansha) 梶田 幸秀  九州大学, 工学研究院, 准教授 (10403940)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords複数回連続強震 / 載荷パターン / 入力強度 / 入力順序 / 耐力低下 / 橋台アプローチ部 / 液状化 / 沈下 / 橋台背面アプローチ / 過剰間隙水圧 / 鋼製橋脚 / 地震時耐荷性状 / 段差量(沈下量) / 耐力劣化 / 段差量 / 使用性リスク / 車両通行性 / 橋台アプローチ / 進行性破壊
Outline of Final Research Achievements

We investigated the progress of subsidence due to liquefaction of the abutment approach and the repeated decrease in the bearing capacity of steel piers. As a result of the examination, the amount of subsidence of the abutment approach and the response displacement of the pile increase due to multiple strong earthquakes with the same input strength. However, if the input after the mainshock had a measured seismic intensity of about 3, it was found that the drainage compacted the ground after the mainshock, and the amount of subsidence of the abutment rear approach part was almost unchanged. It was also confirmed that the maximum yield strength of steel piers decreases as local buckling progresses due to multiple strong earthquakes.
It was clarified that the damage would be expanded by multiple strong earthquakes of the same scale as the mainshock, and that the damage, in that case, would be smaller than the simple sum of damage prediction by the ground motion alone.

Academic Significance and Societal Importance of the Research Achievements

2016年熊本地震では設計地震動(レベル2)相当と考えられる震度6弱以上がKiK-net益城観測点で約28時間内に5回も観測された。通常の設計では,原則として強震動にさらされるのは1回としている。この事象に対し,設計上どのように考慮すべきかに関して知見を得ることは重要な課題である。この課題に対して,橋台アプローチ部の液状化による沈下量の進展や鋼製橋脚の繰り返しによる最大耐力の低下の影響を把握したことは今後の耐震設計法を整備するうえで学術的にも意義ある成果である。
また,複数回連続強震による橋台アプローチ部の沈下量を適切に評価することは地震後の早期復旧に資すると考えられ社会的意義も大きい。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019 2018

All Journal Article (7 results) (of which Peer Reviewed: 4 results) Presentation (3 results)

  • [Journal Article] Load-bearing properties of steel bridge piers subjected to multiple consecutive strong motions2020

    • Author(s)
      Takeshi Kitahara, Ryo Sudo, and Yuka Ohtani
    • Journal Title

      Proceedings of 17th World Conference on Earthquake Engineering

      Volume: 17

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Investigation for subsidence at the approaching areas of abutments induced by sequenced ground motions2020

    • Author(s)
      Yukihide Kajita, Seiji Fukui, Takeshi Kitahara, Kunihiko Uno and Taiji Mazda
    • Journal Title

      Proceedings of 17th World Conference on Earthquake Engineering

      Volume: 17

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Investigation on the effect of countermeasures for subsidence at the approaching areas of abutments2019

    • Author(s)
      Yukihide Kajita, Kazuki Onoda, Taiji Mazda, Kunihiko Uno, Takeshi Kitahara
    • Journal Title

      Interdependence between Structural Engineering and Construction Management

      Volume: 6

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] 複数回連続強震を受ける箱形およびパイプ断面鋼製橋脚の繰り返し耐荷性状2019

    • Author(s)
      北原武嗣,須藤遼,大谷友香
    • Journal Title

      構造物の安全性および信頼性(JCOSSAR2019)論文集

      Volume: 9 Pages: 156-161

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] 複数回地震動作用時における橋台背面アプローチ部の沈下に対する検討2019

    • Author(s)
      梶田幸秀,斧田和樹,宇野州彦,北原武嗣,松田泰治
    • Journal Title

      インフラ・ライフライン減災対策シンポジウム講演集

      Volume: 第9回 Pages: 87-92

    • Related Report
      2018 Research-status Report
  • [Journal Article] 複数回連続強震を受ける鋼製橋脚の耐荷性状に関する一検討2018

    • Author(s)
      須藤遼,反田敦也,北原武嗣,大谷友香
    • Journal Title

      性能に基づく橋梁等の耐震設計に関するシンポジウム講演論文集

      Volume: 第21回 Pages: 117-120

    • Related Report
      2018 Research-status Report
  • [Journal Article] 複数回連続強震を受ける鋼製無補剛箱形断面橋脚の耐荷性状に関する解析的検討2018

    • Author(s)
      須藤遼,北原武嗣,大谷友香,反田敦也
    • Journal Title

      地震工学研究発表会講演論文集

      Volume: 第38回

    • Related Report
      2018 Research-status Report
  • [Presentation] 複数回地震動作用時における橋台背面アプローチ部の段差量に関する考察2021

    • Author(s)
      梶田幸秀,福井誠司,松田泰治
    • Organizer
      土木構造物の復旧性評価に関するシンポジウム論文集
    • Related Report
      2020 Annual Research Report
  • [Presentation] 複数回地震動による橋台背面部の沈下に対する種々の検討2021

    • Author(s)
      石丸輝,梶田幸秀,福井誠司,松田泰治
    • Organizer
      令和2年度土木学会西部支部研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 複数回連続強震を受ける円形パイプ断面鋼製橋脚の耐力低下に関する検討2019

    • Author(s)
      須藤遼,北原武嗣,大谷友香
    • Organizer
      第46回土木学会関東支部技術研究発表会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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