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Development of Mobile Technique for Emergency Retrofit of Shear-damaged RC Columns Using Fiber-belt Prestressing

Research Project

Project/Area Number 20K04794
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 23010:Building structures and materials-related
Research InstitutionUniversity of the Ryukyus

Principal Investigator

NAKADA Kozo  琉球大学, 工学部, 教授 (80347129)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsプレストレス / 横拘束 / 拘束コンクリート / 応急補強 / 軸耐力 / せん断破壊 / リハビリテーション / ひび割れ閉合 / ひび割れ併合 / エポキシ樹脂補修 / トラス・アーチ機構
Outline of Research at the Start

本研究の最終目標は,初期緊張ひずみを導入したアラミド繊維ベルトでRC柱をあらかじめ締め付けることによって得られる能動横拘束を,地震被災RC柱の「ひび割れ閉合」に応用し,簡便・迅速・安価な機動的応急補強法を確立することである。能動横拘束を地震被災RC柱のひび割れ閉合に活用することで,養生期間を必要とする従来の樹脂注入に比べて,本応急補強はひび割れ閉合直後から横拘束およびせん断補強効果を発揮できる。本研究では,水平加力実験と圧縮実験の2種類の構造実験から,能動横拘束が損傷RC柱の圧縮性能やせん断伝達機構に与える影響を検証し,応急補強法としての性能評価式を確立することを目的としている。

Outline of Final Research Achievements

The ultimate purpose of this research is development of a simple, quick, and inexpensive mobile-emergency retrofitting technique to close the cracks of shear-damaged reinforced concrete (RC) columns via applying active lateral confinement pressure using fiber belts. In this study, the shear transition mechanism, and the recovery of seismic performance of shear-damaged RC columns retrofitted using mobile emergency technique were examined under the axial compressive and lateral loading tests. The results showed that: 1) applying active lateral confinement pressure on the shear-damaged RC columns largely restored their flexural strength, but smaller stiffness recovery was observed; 2) Applying active lateral confinement pressure led to a more efficient shear reinforcement; 3) Use of epoxy resin in conjunction with applying active lateral confinement pressure resulted in a significant recovery of both lateral strength and stiffness of shear-damaged RC columns.

Academic Significance and Societal Importance of the Research Achievements

本研究の重要なキーワードは,コンクリートをあらかじめ締付ける「能動横拘束」である。能動横拘束効果によって,コンクリートの圧縮強度は増大する。本研究では,この能動横拘束を地震によってひび割れが生じた損傷RC柱の「ひび割れ閉合」に応用する点に学術的意義がある。また,本研究の成果は,(1)連続発生する大地震や余震における震災建築物の損傷進行を阻止し得る,(2)震災建築物付近の安全確保や不動財産の保全に繋がる,(3)応急仮設住宅等の需要や災害廃棄物発生量を抑制することにも繋がる,などの点から社会的意義があると考えられる。

Report

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

    (5 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results)

  • [Journal Article] Experimental Investigation on Shear-damaged RC Columns Retrofitted By Prestressed Fiber Belts2023

    • Author(s)
      Mohammad Zahid NOORI, Kozo NAKADA, Daiki SENAGA and Kazuo KANEDA
    • Journal Title

      コンクリート工学年次論文集

      Volume: 45 Pages: 229-234

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] AXIAL AND CYCLIC LOADING TESTS OF DAMAGED-RC COLUMNS RETROFITTED BY FIBER BELT PRESTRESSING2022

    • Author(s)
      中田幸造,瀬長大輝,永木 瞭,山川哲雄,金田一男,黒木正幸
    • Journal Title

      AIJ Journal of Technology and Design

      Volume: 28 Issue: 69 Pages: 649-654

    • DOI

      10.3130/aijt.28.649

    • ISSN
      1341-9463, 1881-8188
    • Year and Date
      2022-06-20
    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Experimental Investigation on Shear-damaged RC Columns Retrofitted by Prestressed Fiber Belts2023

    • Author(s)
      NOORI Mohammad Zahid, NAKADA Kozo, SENAGA Daiki and KANEDA Kazuo
    • Organizer
      日本建築学会九州支部研究報告会
    • Related Report
      2022 Research-status Report
  • [Presentation] ひび割れ閉合と樹脂補修を併用したせん断損傷RC柱の水平加力実験2022

    • Author(s)
      瀬長大輝,中田幸造,山川哲雄,金田一男
    • Organizer
      日本建築学会大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 能動横拘束された損傷RC柱のせん断破壊実験2021

    • Author(s)
      瀬長大輝,中田幸造,金田一男,永木 瞭,山川哲雄
    • Organizer
      日本建築学会大会
    • Related Report
      2021 Research-status Report

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

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