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Improvement of fatigue strength in welded joints by externally bonded carbon fiber sheets using VaRTM technique

Research Project

Project/Area Number 17K06538
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Structural engineering/Earthquake engineering/Maintenance management engineering
Research InstitutionTokyo Metropolitan University

Principal Investigator

Nakamura Hitoshi  首都大学東京, 都市環境科学研究科, 准教授 (70264596)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords構造工学・地震工学 / 構造・機能材料 / 維持管理工学 / 補修・補強 / 疲労対策 / CFRP / 溶接継手 / 疲労強度 / 疲労耐久性 / 補強 / 炭素繊維シート / 真空含浸接着
Outline of Final Research Achievements

Fatigue damages have been frequently reported on urban steel bridges and their countermeasures are urgently required. As a preventive maintenance against fatigue damage, this study proposes a new repair method using externally bonded carbon fiber sheets using by the vacuum assisted resin transfer molding before initiation of fatigue cracks, and the validity and usefulness have been verified by experiments and analysis. Finally, for practical use to existing steel bridges, the strengthening design method using externally bonded CFRP will be established.

Academic Significance and Societal Importance of the Research Achievements

提案工法は,接着接合を基本としているため,当て板のボルト接合や溶接接合と比べて,母材への孔明けによる欠損や残留応力が生じないこと,母材への影響が極めて小さいことから,疲労対策としては有利であり,本研究の成果から補強効果が示されたため,溶接接合部の種々のディテールへの応用も十分に期待できる.

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (19 results)

All 2020 2019 2018 2017

All Journal Article (9 results) (of which Int'l Joint Research: 1 results,  Open Access: 6 results,  Peer Reviewed: 4 results) Presentation (10 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] 積層した炭素繊維シートのVaRTM成形・接着による面外ガセット溶接継手の疲労耐久性の向上2020

    • Author(s)
      タイウィサル,小沢拓弥,譚暢,中村一史,松井孝洋
    • Journal Title

      日本鋼構造協会,鋼構造論文集

      Volume: 27 Pages: 29-41

    • NAID

      130007992303

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 炭素繊維シートが積層接着された十字溶接継手止端部の応力集中係数の推定2020

    • Author(s)
      小沢拓弥,タイウィサル,中村一史,松井孝洋
    • Journal Title

      日本鋼構造協会,鋼構造論文集

      Volume: 27 Pages: 89-98

    • NAID

      130007992342

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Permanent Repair of Fatigue Cracks of Welded Gusset Joints by Externally Bonded Carbon Fiber Sheets Using VARTM Technique2019

    • Author(s)
      Visal Thay, Takumi Ozawa, Hitoshi Nakamura, Takahiro Matsui
    • Journal Title

      JSCE, The 13th Symposium on Research and Application of Hybrid and Composite Structures

      Volume: 13 Pages: 268-276

    • Related Report
      2019 Annual Research Report
    • Open Access
  • [Journal Article] 炭素繊維シートの真空含浸接着による十字溶接継手の疲労強度向上に関する研究2019

    • Author(s)
      小沢拓弥,タイウィサル,中村一史,松井孝洋
    • Journal Title

      第13回複合・合成構造の活用に関するシンポジウム,土木学会

      Volume: 13 Pages: 277-285

    • Related Report
      2019 Annual Research Report
    • Open Access
  • [Journal Article] Analytical Study on Permanent Repair of Fatigue Cracks Initiated at Welded Gusset Joints by Externally Bonded Carbon Fiber Sheets2019

    • Author(s)
      Visal Thay, Takumi Ozawa, Hitoshi Nakamura, Takahiro Matsui
    • Journal Title

      JSSC, Proc. of Constructional Steel

      Volume: 27 Pages: 793-800

    • Related Report
      2019 Annual Research Report
    • Open Access
  • [Journal Article] EVALUATION OF FATIGUE STRENGTH OF ADHESIVELY BONDED JOINTS BETWEEN STEEL PLATES AND PATCH PLATES USING EPOXY RESIN ADHESIVE2018

    • Author(s)
      タイウィサル,中村一史,林帆,堀井久一
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))

      Volume: 74 Issue: 5 Pages: II_56-II_66

    • DOI

      10.2208/jscejseee.74.II_56

    • NAID

      130007381729

    • ISSN
      2185-4653
    • Related Report
      2018 Research-status Report
  • [Journal Article] 炭素繊維シートの真空含浸接着によるリブ十字溶接継手の補強に関する基礎的研究2018

    • Author(s)
      小沢拓弥,タイウィサル,中村一史,松井孝洋
    • Journal Title

      土木学会,第7回FRP複合構造・橋梁に関するシンポジウム

      Volume: 第7回 Pages: 96-102

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 積層した炭素繊維シートのVaRTM成形・接着による面外ガセット溶接継手の疲労耐久性の向上2018

    • Author(s)
      タイウィサル,小沢拓弥,譚暢,中村一史,松井孝洋
    • Journal Title

      土木学会,第7回FRP複合構造・橋梁に関するシンポジウム

      Volume: 第7回 Pages: 103-109

    • NAID

      130007992303

    • Related Report
      2018 Research-status Report
  • [Journal Article] 当て板がエポキシ樹脂で接着された鋼板の接着接合部の疲労強度の評価2018

    • Author(s)
      タイウィサル,中村一史,林帆,堀井久一
    • Journal Title

      土木学会,土木学会論文集A1(構造・地震工学)

      Volume: Vol.73,No.5

    • NAID

      130007381729

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 炭素繊維シートの真空含浸による非荷重伝達型十字溶接継手の補強について2019

    • Author(s)
      小沢拓弥,タイウィサル,中村一史,松井孝洋
    • Organizer
      土木学会,年次学術講演会講演概要集,第74回,I-145
    • Related Report
      2019 Annual Research Report
  • [Presentation] Analytical study on permanent repair of fatigue cracks of welded gusset joints by externally bonded carbon fiber sheets2019

    • Author(s)
      Visal Thay, Takumi Ozawa, Hitoshi Nakamura, Takahiro Matsui
    • Organizer
      roc. of the 74th Annual Conference of JSCE, CS2-042
    • Related Report
      2019 Annual Research Report
  • [Presentation] Evaluation of static and fatigue strength of adhesively bonded joints between steel plates and patch plates using epoxy resin adhesive2019

    • Author(s)
      Visal Thay, Hitoshi Nakamura, Hisakazu Horri
    • Organizer
      12th Pacific Structural Steel Conference (PSSC), Tokyo, Japan
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Strengthening of Cruciform Welded Joints by Externally Bonded Carbon Fiber Sheets Using VARTM Technique2019

    • Author(s)
      Takumi Ozawa, Visal Thay, Hitoshi Nakamura, Takahiro Matsui, Mutsumi Miyagawa
    • Organizer
      The Seventh Asia-Pacific Conference on FRP in Structures (APFIS2019), IIFC
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Repair of Fatigue Cracks of Welded Gusset Joints by Externally Bonded Carbon Fiber Sheets Using VARTM Technique2019

    • Author(s)
      Visal Thay, Takumi Ozawa, Hitoshi Nakamura, Takahiro Matsui
    • Organizer
      The Seventh Asia-Pacific Conference on FRP in Structures (APFIS2019), IIFC
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improvement of fatigue durability in welded gusset joints by CF sheets using VaRTM technique2018

    • Author(s)
      V. Thay, C. Tan, H. Nakamura, T. Matsui and F. Lin
    • Organizer
      The 9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE2018
    • Related Report
      2018 Research-status Report
  • [Presentation] 炭素繊維シートの真空含浸・積層接着による面外ガセット溶接継手の疲労耐久性の向上2018

    • Author(s)
      タイウィサル,譚暢,中村一史,松井孝洋
    • Organizer
      土木学会,第73回年次学術講演会講演概要集
    • Related Report
      2018 Research-status Report
  • [Presentation] 炭素繊維シートの真空含浸接着による面外ガセット溶接継手止端部の応力集中の低減効果2018

    • Author(s)
      譚暢,タイウィサル,中村一史,松井孝洋
    • Organizer
      土木学会,第44回関東支部技術研究発表会
    • Related Report
      2017 Research-status Report
  • [Presentation] 炭素繊維シートの真空含浸接着による面外ガセット溶接継手の疲労強度向上に関する研究2018

    • Author(s)
      タイウィサル,譚暢,中村一史,松井孝洋
    • Organizer
      土木学会,第44回関東支部技術研究発表会
    • Related Report
      2017 Research-status Report
  • [Presentation] Evaluation of static and fatigue strength of adhesively bonded joints2017

    • Author(s)
      Visal Thay, Hitoshi Nakamura, Hisakazu Horii
    • Organizer
      土木学会,第72回年次学術講演会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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