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1993 Fiscal Year Final Research Report Summary

Evaluation of Fatigue of FRP Tendons based on Fracture Energy Theory

Research Project

Project/Area Number 04452221
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field コンクリート工学・土木材料・施工
Research InstitutionUniversity of Tokyo

Principal Investigator

UOMOTO Taketo  University of Tokyo, Institute of Industrial Science, Professor, 生産技術研究所, 教授 (80114396)

Co-Investigator(Kenkyū-buntansha) OHGA Hiroyuki  University of Tokyo, Institute of Industrial Science, Assistant Professor, 生産技術研究所, 講師 (40152061)
Project Period (FY) 1992 – 1993
KeywordsFRP tendon / carbon fiber / aramid fiber / glass fiber / fracture energy theory / fatigue / creep / alkali resistivity
Research Abstract

Strength, deformation, and alkali resistivity of FRP tendons using carbon, aramid or glass fibers are studied. Based on fracture energy theory, fatigue properties of the FRP tendons are also evaluated considering the effect of mean stress as well as stress amplitude.
Main results in this study are as follows.
1. Strength of FRP tendons increases with an increase in fiber content. In the case of FRP tendons with high carbon fiber content, the strength are independent of fiber content in some stress area. This is attributed to the effect of stress intensity in the gripping chucks.
2. Fatigue strength is smaller for FRP tendons reinforced by glass fibers, and larger for carbon fibers. Tensile strength of FRP tendons using glass fibers after 4000000 cycles is about a half of virgin tensile strength.
3. As FRP tendons using aramid or glass fibers are suffered from creep, fracture of the FRP tendons due to both fatigue and creep is observed under the high stress condition.
4. The alkali resistivity of fibers can be evaluated by the tensile test results of fibers immersed in alkali solutions. Glass fibers are deteriorated remarkably by alkali solution, but there is almost no effect of alkalinity in the case of carbon and aramid fibers.
5. Deterioration of fibers due to alkalinity can be accelerated by the immersion test in high alkali concentration and high temperature solution. Also it can be predicted using the diffusion theory, and compared with deterioration under an actual environmental condition.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Uomoto H.Hodhod: "Properties of Fiber Reinforced Plastic Rods for Prestressing tendons,Fiber-Reinforced-Plastic Reinforcement for Concrete Structures" A.C.I.SP-138. 101-115 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 魚本健人・西村次男: "プレストレストコンクリート用FRP緊張材の特性(8)" 生産研究. 46(1). 23-25 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 魚本健人・勝木太: "各種繊維の耐アルカリ性の評価方法に関する基礎研究" 土木学会論文集. 23(490)(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 魚本健人・大賀宏行: "プレストレストコンクリート用FRP緊張材の特性(9)" 生産研究. 46(6)(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西村次男・魚本健人: "FRPロッドの動的疲労特性" 第48回土木学会年次学術講演会講演概要集. 308-309 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮崎太・魚本健人・西村次男: "アルカリによるガラス繊維の劣化性状" 第48回土木学会年次学術講演会講演概要集. 358-359 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Uomoto, H.Hodhod: "Properties of Fiber Reinforced Plastic Rods for Prestressing tendons, Fiber-Reinforced-Plastic Reinforcement for Concrete Structures" A.C.I.SP-138. 101-115 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Uomoto, T.Nishimura: "Properties of Fiber Reinforced Plastic Rods for Prestressing Tendons of Concrete (8)" Seisan Kenkyu. 46(1). 23-25 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Uomoto, F.Katsuki: "A fundamental Study on Evaluation Method for Alkali-Resistance of Fibers" Dobokugakkai-Ronbunsyu. 23(490), (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Uomoto, H.Ohoga: "Properties of Fiber Reinforced Plastic Rods for Prestressing Tendons of Concrete (9)" Seisan Kenkyu. 46(6), (in press). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Nishimura, T.Uomoto: "No.48 Dobokugakkai Nenji Gakujyutukoenkai Koengaiyousyu" 308-309 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F.Miyazaki, T.Uomoto, T.Nishimura: "No.48 Dobokugakkai Nenji Gakujyutukoenkai Koengaiyousyu" 358-359 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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