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Corrosion Resistant Rehabilitation of Offshore Structures by Using FRP

Research Project

Project/Area Number 12555275
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 船舶工学
Research InstitutionThe University of Tokyo

Principal Investigator

KAGEYAMA Kazuro  The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (50214276)

Co-Investigator(Kenkyū-buntansha) KATO Tetsuji  The University of Tokyo, Graduate School of Engineering, Research associate, 大学院・工学系研究科, 助手 (70323540)
OHSAWA Isamu  The University of Tokyo, Graduate School of Engineering, Research associate, 大学院・工学系研究科, 助手 (00143389)
金原 勲  金沢工業大学, 高度材料科学研究開発センター, 教授 (50011101)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥9,400,000 (Direct Cost: ¥9,400,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsFRP / MP Method / Composite Materials / Repair / Adhesive / Rehabilitation / Toughness / Marine Environment / 接着 / FRP補修
Research Abstract

Strength of structure repaired with externally bonded FRP sheet depends on bonding strength between FRP sheets and substrate. It is important to evaluate a bonding strength between FRP sheets and substrate. Numerous researchers have noticed debond and peel during tests and have voiced concern related to this mode of failure. Further investigations into mechanisms of peel and the characteristics of the composites-substrate interface during debonding and peeling are thus critical to understanding both design requirements and long-term use potential of composite plates as a means of rehabilitation of infrastructure elements. In this study, we investigated about two topics : First is durability of a single notch beam repaired with externally bonded composite under fatigue loading, second is environmental durability of steel attached with externally bonded composite in marine environment.
A single edge notched beam repaired with externally bonded CFRP sheet was analyzed under three-point-ben … More ding load based on linear elastic fracture mechanics. Reduction of stress intensity factor at the crack tip was calculated theoretically. The increase in fatigue strength of test specimens reinforced with various CFRP sheet patches was confirmed experimentally. Resistance effects of crack propagation under fatigue loading were also evaluated experimentally. Crack growth of a repaired specimen was controlled by the effective stress intensity factor proposed in the present paper.
The environmental durability of steel members reinforced by external FRP sheets was successfully evaluated in marine environment based on the proposed "Membrane Peeling" test method. Four kinds of CFRP sheets were prepared : four resins, epoxy, vinyl ester, isophthalic and orthophthalic polyester resin. The bonding strength of steel member reinforced by epoxy resin was found to be as twice as strong that of steel member reinforced by the others resin before these test specimens were immersed in seawater. On the other hand, steel member reinforced by epoxy resin got most decreased debonding strength after immersion in seawater for one month. Bonding strength degraded immediately after immersion for six months, because CF-Vinyl ester and CF-Isophthalic resin were showed interface peeling between CF sheet and substrate. After immersion for twelve months, bonding strength deteriorated due to change of fracture mode. Less

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 山口晃司, 金原勲, 影山和郎, 高梨正祐: "FRPシートによる鋼構造補修システムにおける海水環境中の接着強度評価に関する研究"日本造船学会論文集. 188号. 719-726 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamaguchi, I.Kimpara, K.Kageyama, M.Takanashi: "Durability of Steel Members Reinforced by FRP Sheet in Marine Environment"US-Japan Conference on Composite Materials. 555-562 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamaguchi, I.Kimpara, K.Kageyama: "Repaired Efficiency in a Notched Steel Beam Reinforced with CFRP Patches under Static and Fatigue Loading"ACCM2000. 1007-1012 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamaguchi, I.Kimpara, K.Kageyama: "Interfacial Properties Control the Durability of Externally Repaired Infrastructures with Composite Materials"Durability Analysis of Composite Systems 2001. 19-25 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Yamaguch, I. Kimpara, K. Kageyama, M. Takanashi: "Investigating on bonding strength in marine environment for repaired steel structures with FRP sheets"Journal of the Society of Naval Architects of Japan. 188. 719-726 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Yamaguchi, I. Kimpara, K. Kageyama and M. Takanashi: "Durability of Steel Members Reinforced by FRP Sheet in Marine Environment"US-Japan Conference on Composite Materials. 555-562 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Yamaguchi, I. Kimpara and K. Kageyama: "Repaired Efficiency in a Notched Steel Beam Reinforced with CFRP Patches under Static and Fatigue Loading"ACCM2000. 1007-1012 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. Yamaguchi, I. Kimpara and K. Kageyama: "Interfacial Properties Control the Durability of Externally Repaired Infrastructures with Composite Materials"Durability Analysis of Composite Systems 2001. 19-25 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Yamaguchi, I.Kimpara, K.Kageyama: "Interfacial Properties Control the Durability of Externally Repaired Infrastructures with Composite Materials"Durability Analysis of Composite Systems 2001. 19-25 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Kageyama: "Interfacial Properties Control the Durability of Externally Repaired Infrastructures with Composite Materials"Duracosys 2001-5th international Conference on Durability Analysis of Composite Systems. 124-128 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 山口晃司,金原勲,影山和郎,高梨正祐: "FRPシートによる鋼構造補修システムにおける海水環境中の接着強度評価に関する研究"日本造船学会論文集. 第188号. 719-726 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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