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Rehabilitation Systems of Damaged Infrastructures by Using Carbon Fiber Sheets

Research Project

Project/Area Number 07555316
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

KIMPARA Isao  University of Tokyo Division of Engng.Professor, 大学院・工学系研究科, 教授 (50011101)

Co-Investigator(Kenkyū-buntansha) OHSAWA Isamu  University of Tokyo Division of Engng.Assis.Res., 大学院・工学系研究科, 助手 (00143389)
SUZUKI Toshio  University of Tokyo Division of Engng.Assis.Res., 大学院・工学系研究科, 助手 (20010895)
KAGEYAMA Kazuro  University of Tokyo Division of Engng.Professor, 大学院・工学系研究科, 教授 (50214276)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥11,200,000 (Direct Cost: ¥11,200,000)
Fiscal Year 1997: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1996: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1995: ¥5,000,000 (Direct Cost: ¥5,000,000)
KeywordsRehabilitation / Infrastructures / Carbon Fibers / Reinforcing Effect / Acoustic Emision / Fracture Toughness / Energy Release Rate / Bonding Strength / アコースティックエミション / 破壊靭性 / AE法 / 相関はく離 / 接着界面 / 構造モデル / 強度低下 / 層間はく離
Research Abstract

Much attention has been paid in recent years to rehabilitation of damaged infrastructures by using composite wrap such as fiber reinforced plastics (FRP) sheets as external reinforcements. The purpose of this study is to make a quantitative clarification of the reinforcing effects of carbon fiber sheets bonded on damaged infrastructures and to give a theoretical basis to establish a rehabilitation system by using composite wrap.
(1) A mechanical model was proposed based on linear elastic fracture mechanics to investigate the reinforcing effect for strength reduction due to a crack, the bonding strength and the failure modes in view of the rehabilitation of cracked beams by using composite wrap. A three-point flexure test method was devised in which a single edge notched concrete beam specimen strengthened externally by bonding unidirectional FRP sheets on the bottom tensile zone to evaluate the reinforcing effects quantitatively.
(2) The above test method was applied to concrete and mort … More ar beam specimens with and without a center notch with carbon fiber sheets bonded through the actual spot processing in view of evaluating rehabilitation as reinforcing and repair. The failure process as well as load, strain and crack opening displacement behavior were monitored by detecting acoustic emission (AE) activity and by AE moment tensor analysis. The relation between reinforcing effect and fracture toughness at the initiation of AE activity was discussed based on these results.
(3) A new peeling test method to evaluate bonding strength between FRP sheets and concrete was proposed in which a thin FRP sheet was bonded on a concrete block and out-of-plane force was applied to FRP sheet to propagate debonding. This test method gave a good measure to characterize a peeling strength and examine the effects of different surface treatment and primer in terms of energy release rate. A simplified data reduction method was also proposed to measure the energy release rate based on the deformation of membrane. Less

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 大澤 勇 他: "FRP補強モルタルの破壊過程とAE特性" 第10回 アコースティック・エミション総合コンファレンス論文集. 第10回. 201-206 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kageyama et al: "FRACTURE MECHANICS STUDY ON REHABILITATION OF DAMAGED INFRASTRUCTURES BYUSING COMPOSITE WRAPS" Proceedings 10th International Conference on Composite Materials. 10. III-597-604 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] I.Ohsawa et al: "AE Characterization of Failure Process of Concrete Beams Reinforced withCFRP Sheets" Progress in Acoustic Emission VIII. 8. 127-132 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] I.Kimpara et al: "Experimental Characterization ofReinforcing Effects of FRP Sheets Bonded on Mortar and Concrete Beams" Proceedings 11th International Conferencs on Composite Materials. 11. VI-61-25 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Yamaguchi et al: "PROPOSAL OF PEELING TEST METHOD OF FRP SHEETS BONDED ON CONCRETE" Proceedings 4th Japan International SAMPE Symposium. 4. 771-776 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 李 正旺 他: "モーメント・テンソル解析によるFRP補強コンクリートはりの破壊挙動の評価" 第11回 アコースティック・エミション総合コンファレスンス論文集. 11. 85-90 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] I.Ohsawa et al.: "Failure Process and Acoustic Emission Properties of FRP Reinforced Mortar" Proc.10th National Conference on Acoustic Emission. 201-206 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kageyama et al.: "FRACTURE MECHANICS STUDY ON REHABILITATION OF DAMAGED INFRASTRUCTURES BY USING COMPOSITE WRAPS" Proc.10th International Conference on Composite Materials. III597-604 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] I.Ohsawa et al.: "AE characterization of failure process of concrete beams reinforced with CFRP sheets" Proc.13th International Acoustic Emission Symposium. 127-132 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] I.Kimpar et al.: "EXPERIMENTAL CHARACTERIZATION OF REINFORCING EFFECTS OF FRP SHEETS BONDED ON MORTAR AND CONCRETE BEAMS" Proc.11th International Confeence on Composite Materials. VI-16-25 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Yamaguchi et al.: "PROPOSAL OF PEELlNG TEST METHOD OF FRP SHEETS BONDED ON CONCRETE" Proc.4th Japan International SAMPE Symposium. 771-776 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Z.W.Li et al.: "Evaluation of Fracture Behavior of FRP Reinforced Concrete Beams by Moment Tensor Analysis" Proc.11th National Conference on Acoustic Emission. 85-90 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大澤 勇 他: "FRP補強モルタルの破壊過程とAE特性" 第10回 アコースティック・エミション総合コンファレンス論文集. 第10回. 201-206 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Kageyame et al: "FRACTURE MECHANICS STUDY ON REHABILITATION OF DAMAGED INFRASTRUCTURES BY USING COMPOSITE WRAPS" Proceedings 10th International Conference on Composite Materials. 10. III-597-604 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] I.Ohsawa et al: "AE Characterization of Failure Process of Concrete Beams Reinforced with CFRP Sheets" Progress in Acoustic Emission VIII. 8. 127-132 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] I.Kimpara et al: "Experimental Characterization of Reinforcing Effects of FRP Sheets Bonded on Mortar and Concrete Beams" Proceedings 11th International Conferencs on Composite Materials. 11. VI-61-25 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Yamaguchi et al: "PROPOSAL OF PEELING TEST METHOD OF FRP SHEETS BONDED ON CONCRETE" Proceedings 4th Japan International SAMPE Symposium. 4. 771-776 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 李 正旺 他: "モーメント・テンソル解析によるFRP補強コンクリートはりの破壊挙動の評価" 第11回 アコースティック・エミション総合コンファレンス論文集. 11. 85-90 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] I.Ohsawa et al.: "AE charcterigation of failure process of concrete beams reinforced with CFRP sheets" Progress in Acoustic Emission. VIII. p127-p132 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] I.Kimpara et al.: "Experimental Characterigation of Reinforced Effects of FRP Sheets bonded on Mortar and Concrete Beams" Proc.11th Intern.Comf.Compos.Mater.11(発表予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] K. Kageyama et al.: "Fracture Mechanics Study on Rehabilitaion of Damaged Infrastructure by Using Composite Wraps" Proc. 10th Inter. Conf. Compos. Mater.Vol.3. 597-604 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2021-09-14  

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