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Clarification of bond and anchorage behavior and its stress transfer mechanism of deformed reinforcement bar

Research Project

Project/Area Number 21H01408
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22010:Civil engineering material, execution and construction management-related
Research InstitutionNagoya University

Principal Investigator

NAKAMURA HIKARU  名古屋大学, 工学研究科, 教授 (60242616)

Co-Investigator(Kenkyū-buntansha) 三浦 泰人  名古屋大学, 工学研究科, 准教授 (10718688)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2023: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2022: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
Keywords付着 / 構造細目 / フック / 重ね継手 / 損傷進展 / 応力伝達メカニズム / 剛体バネモデル / 繊維補強コンクリート / 割裂破壊 / テンションスティフニング効果 / ポストヘッドバー / 横方向鉄筋 / 応力伝達 / 定着 / 曲げ変形挙動 / 光ファイバー / 内部ひび割れ進展 / 画像相関法
Outline of Research at the Start

コンクリート構造物では鉄筋の付着・定着が確保されていることを前提とし、その前提を構造細目として仕様規定として定めている。しかし、その幾つかは力学的根拠を説明することが困難となっており、合理的な配筋規定への変更をする場合に障害となることが生じている。
本研究では、①体系的な付着・定着引抜き試験の実施と工夫した計測技術による鉄筋近傍からの内部ひび割れなどの損傷進展の把握、②最新の数値解析技術による内部損傷進展や応力伝達挙動の把握、を行い損傷進展挙動や応力伝達メカニズムを明確にし、付着・定着に対する「暗黙知」を「形式知」に変え、合理的な配筋規定確立のための知見を得る。

Outline of Final Research Achievements

The experiments and numerical analyses to investigate the damage propagation behavior and stress transfer mechanism of several problems related to the bond or anchorage of reinforcement bars in concrete structures were conducted.
As a result, regarding anchorage hook, it was clarified that complex bending deformation behavior occurs during pullout, affecting the slip behavior and stress transfer mechanism within the hooks. Regarding the lap splices, the stress transfer behavior between lap portion and the crack propagation behavior following to splitting failure was revealed. In addition, the mechanism by which the bond of reinforcing bars installed within holes affects the shear capacity of perforated steel plates was clarified. Furthermore, a rigid spring model capable to simulate fiber reinforced concrete (FRC) was developed, enabling the analysis of the bond and anchorage performance of FRC.

Academic Significance and Societal Importance of the Research Achievements

コンクリート構造物では、鉄筋の付着・定着に係わる構造細目は、数10年前に規定されたものが殆どで、その幾つかはその力学的根拠も説明することが困難となっている。
本研究は、実験と付着やコンクリートのひび割れ進展挙動を精度よく評価できる剛体バネモデルを用いて、付着・定着に関わるいくつかの問題のメカニズムを明らかにした。これにより、従来「暗黙知」であった問題を「形式知」に変えることが可能になり、合理的なコンクリートの構造細目の設定や、構造細目の照査の道筋がつけられた。このことは、設計に対する貢献だけでなくコンクリート構造物の施工の合理化につながり、コンクリート工の生産性向上に寄与する。

Report

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

    (14 results)

All 2023 2022 Other

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Experimental study on the effect of different shear reinforcement shapes and arrangement on 3D crack propagation and shear failure mechanism in RC beams2023

    • Author(s)
      Muhammad Abdullah, Hikaru Nakamura, Keisuke Kawamura, Masashi Takemura, Taito Miura
    • Journal Title

      Structures

      Volume: 58 Pages: 105453-105453

    • DOI

      10.1016/j.istruc.2023.105453

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mesoscopic evaluation of the bond behavior of concrete with deformed rebar subjected to passive confinement employing 3D discrete model2023

    • Author(s)
      Shoaib Karam, M., Nakamura, H., Yamamoto, Y., Tahir, M., Hameed, R.
    • Journal Title

      Engineering Fracture Mechanics

      Volume: 295 Pages: 109790-109790

    • DOI

      10.1016/j.engfracmech.2023.109790

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mesoscale modeling of steel fiber based on 3D RBSM considering the effects of fiber shape and orientation2023

    • Author(s)
      Atik Sarraz, Hikaru Nakamura, Taito Miura
    • Journal Title

      Cement and Concrete Composite

      Volume: 139 Pages: 105039-105039

    • DOI

      10.1016/j.cemconcomp.2023.105039

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Bond behavior simulation of deformed rebar in fiber-reinforced cementitious composites using three-dimensional meso-scale model2022

    • Author(s)
      Atik Sarraz, Hikaru Nakamura, Toshiyuki Kanakubo, Taito Miura, Hiroya Kobayashi
    • Journal Title

      Cement and Concrete Composite

      Volume: 131 Pages: 104589-104589

    • DOI

      10.1016/j.cemconcomp.2022.104589

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 端部にフックを有する重ね継手部の数値解析的評価2022

    • Author(s)
      森大輔、中島達也、中村光、三浦泰人
    • Journal Title

      コンクリート工学年次論文集

      Volume: Vol.44, No.2, Pages: 829-834

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Evaluation of failure mechanism in lap splices and role of stirrup confinement using 3D RBSM2022

    • Author(s)
      Farooq Usman、Nakamura Hikaru、Miura Taito
    • Journal Title

      Engineering Structures

      Volume: 252 Pages: 113570-113570

    • DOI

      10.1016/j.engstruct.2021.113570

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Numerical evaluation on effect of reinforcement detailing of concrete structures using Meso-Scale simulation2023

    • Author(s)
      Hikaru Nakamura
    • Organizer
      21th ASEP International Convention (21AIC3)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Applicability of proposed steel fiber model based on 3D RBSM to simulate the mechanical behavior of steel fiber reinforced concrete2023

    • Author(s)
      Atik Sarraz
    • Organizer
      fib Symposium 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical investigation on influence of vertical shear leg stirrups to shear failure behavior in wide beams using 3D-RBSM2023

    • Author(s)
      Muhammad Abdullah
    • Organizer
      fib Symposium 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 曲げ内半径の異なるフックの付着・定着挙動および応力伝達メカニズムの明確化2023

    • Author(s)
      中島達也
    • Organizer
      令和5年度土木学会中部支部研究発表会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 3 次元剛体バネモデルによる90 度および180 度フックの定着メカニズムの考察2023

    • Author(s)
      濱千代晃平
    • Organizer
      令和4年度土木学会中部支部研究発表会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Numerical investigation of influence of fiber orientation distribution on bond performance of FRCC using 3D RBSM2022

    • Author(s)
      Atik Sarraz, Hikaru Nakamura, Taito Miura
    • Organizer
      International Conference Bond in concrete
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 付着強度が重ね継手部の挙動に及ぼす影響の数値解析的評価2022

    • Author(s)
      森大輔、中村光,三浦泰人
    • Organizer
      令和3年度土木学会中部支部研究発表会
    • Related Report
      2021 Annual Research Report
  • [Remarks] 名古屋大学 材料形態学グループ コンクリート研究室

    • URL

      http://concrete-lab.civil.nagoya-u.ac.jp/index.html

    • Related Report
      2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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