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Development of mesoscale simulation system for evaluating the performance of repaired RC structures

Research Project

Project/Area Number 21KK0072
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 22:Civil engineering and related fields
Research InstitutionHokkaido University (2023)
The University of Tokyo (2021-2022)

Principal Investigator

NAGAI Kohei  北海道大学, 工学研究院, 教授 (00451790)

Co-Investigator(Kenkyū-buntansha) 松本 浩嗣  北海道大学, 工学研究院, 准教授 (10573660)
鎌田 知久  東京大学, 生産技術研究所, 助教 (70804194)
金澤 健  北海学園大学, 工学部, 准教授 (80823773)
Project Period (FY) 2021-10-07 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2023: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2022: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords鉄筋コンクリート構造 / 補強 / FRP / 微細構造解析 / FRP補強 / 連続繊維シート補強 / 繊維補強コンクリート / 付着 / 鉄筋腐食 / コンクリート / 繊維補強 / 凍結融解作用 / コンクリート構造 / 補修
Outline of Research at the Start

劣化した鉄筋コンクリート構造物の残存性能と補修効果を,申請者が開発した離散解析手法RBSMによる三次元微細構造解析プログラムに水分移動,鉄筋腐食,凍害の影響をモデル化し劣化現象を再現したうえで残存構造性能を解析により示し,損傷後の構造に対して繊維補強コンクリートや連続繊維(FRP)により補修した効果も直接モデル化することで評価可能とすることが本研究の目的である。これを研究代表者の長井および分担研究者が,米国および中国に長期滞在することで共同で進める。

Outline of Final Research Achievements

A continuous fiber sheet model was incorporated into the mesoscale analysis program, which is the core of the study, to analyze bond behavior by tensile testing. The macroscopic adhesion behavior is also affected by crack propagation and damage accumulation on the concrete side at the micro scale.The modeling of the change in fiber contribution under fatigue loading of RC beams with fiber reinforced concrete is discussed, and the change can be considered in terms of material strength and fiber ratio.The reinforcement with continuous fiber sheet FRP was verified by reproducing the experiment in which it was applied to the reinforcement of RC beams.The modeling of water movement was also improved from the existing water movement and mass movement models to be incorporated in this analysis system.

Academic Significance and Societal Importance of the Research Achievements

劣化した鉄筋コンクリート構造の残存性能と補修効果を,開発した離散解析手法RBSMによる三次元微細構造解析プログラムに水分移動や鉄筋腐食をモデル化し劣化現象を再現したうえで残存構造性能を解析により示し,損傷後の構造に対して繊維補強コンクリートや連続繊維(FRP)により補修した効果も直接モデル化することで評価可能とするシステムの開発を進めた。現在,鉄筋コンクリート構造物の劣化を詳細に評価することが困難なうえ,補修した後の効果や,その後の再劣化について予測する技術は整っておらず,本研究のような数値解析によるアプローチは計算機性能の向上とともに,研究レベルから実用に近づける可能性が高まっている。

Report

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

    (4 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results)

  • [Journal Article] Mesoscale discrete simulation of flexural behavior of FRP-strengthened RC beams using 3D RBSM2024

    • Author(s)
      Wenliang Yin, Cheng Jiang, Kohei Nagai
    • Journal Title

      Engineering Structures

      Volume: 310 Pages: 118131-118131

    • DOI

      10.1016/j.engstruct.2024.118131

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A mesoscale simulation of the FRP-to-concrete interfacial debonding propagation process by 3D RBSM2023

    • Author(s)
      Cheng Jiang, Kumar Avadh, Kohei Nagai
    • Journal Title

      Composite Structures

      Volume: 304 Pages: 116336-116336

    • DOI

      10.1016/j.compstruct.2022.116336

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Reproducible estimations of internal corrosion distribution from surface cracks using MPC-RBSM2023

    • Author(s)
      Suhas S. Joshi, Vikas Singh Kuntal, John E. Bolander, Kohei Nagai
    • Journal Title

      Engineering Fracture Mechanics

      Volume: 292 Pages: 109642-109642

    • DOI

      10.1016/j.engfracmech.2023.109642

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Material comparative analysis of crack-bridging degradation of SFRC structural beams under flexural fatigue loading2022

    • Author(s)
      Mohamed Adel, Koji Matsumoto, Tamon Ueda, Kohei Nagai
    • Journal Title

      Construction and Building Materials

      Volume: 339 Pages: 127642-127642

    • DOI

      10.1016/j.conbuildmat.2022.127642

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research

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Published: 2021-10-22   Modified: 2025-01-30  

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