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1997 Fiscal Year Final Research Report Summary

Study on Fatigue Characteristics of Reinforced Concrete Structure under Various environment and its Application to Design

Research Project

Project/Area Number 08650533
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionTottori University, Faculty of Engineering

Principal Investigator

INOUE Shoichi  Tottori University Faculty of Engineering Associate Professor, 工学部, 助教授 (10032286)

Co-Investigator(Kenkyū-buntansha) KURODA Tamotsu  Tottori University Faculty of Engineering Research Assistant, 工学部, 助手 (30263487)
YOSHINO Akira  Tottori University Faculty of Engineering Lecture, 工学部, 講師 (40135835)
Project Period (FY) 1996 – 1997
KeywordsFatigue / Fatigue strength / Fatigue life / Shear fatigue / Flexural fatigue / Marine concrete structure / Surface treatment / Carbon fiber reinforced plastic sheet
Research Abstract

Fatigue characteristics of reinforced concrete beams were investigated under various corrosion environment including under fresh water and sea water and in air. Significant differences were observed in the fatigue strengths between the beams tested in water and those in air. That is, the fatigue strength at 2 * 10^6 cycles for the beams tested in water is smaller by 15 - 25% compared to that in air. This value in the region of shear span/ effective ratio, a/d=3.5 - 4.0 becomes smaller with increases in the value of a/d. The failure pattern of beams differs in air and in water and the failure pattern tends to occur as shear failure without the fatigue fracture of stirrup in water even though the same beam exhibits flexural failure in air. Shear failures may be separated into the shear compressive failure, the failure due to the fracture of tensile reinforcement at the point of intersection of the diagonal crack and the diagonal tensile failure (related to the value of a/d, the strength … More of concrete and the magnitude of the applied maximum load level). The fatigue test the beams which the bending span only was immersed in water was carried. According to the flexural fatigue failure observed from these test, the flexural failure in air was caused by the fracture of tensile reinforcement, but those in water was not only caused by the fracture of tensile reinforcement but by compressive fatigue failure of concrete in bending span.
For the beams subjected to repetitive load under moisture condition the surface treatment and strengthening method using carbon fiber sheet has the effect of increasing in fatigue life. Static and fatigue tests were also conducted on strengthened reinforced concrete beams to investigate the type of failure, and deformation and strength characteristics of the beams, with the presence/absence of anchor bolts and the kind of strengthening materials (steel or CFRP (carbon fiber reinforced plastic) plate) used set as the factors. As a result, (1) the CRRP plate-bounded bemas, as compared with steel plate-bonded beams, were found to have 1) smaller crack widths and crack spacings under identical loadings, 2) smaller deflection and toughness at failure, and 3) larger fatigue strength, and (2) the type of fatigue failure differs depending on the kind of plate, presence of anchor bolts and the magnitude of the applied load. Lastly, from the point of the mechanism of shear fatigue failure tested in water, the shear force component carried by concrete decreases with increases in the number of repetitive loading. Though the shear force component carried by stirrups increases with increases in the number of repetitive loading, the stirrup strain was in pre-yield range. Less

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Shoichi Inoue: "DEFORMATION CHARACTERISTICS,STATIC AND FATIGUE STRENGTHS OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CARBON FIBER-REINFORCED PLASTIC PLATE" Trans.of JCI. 143-150 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Katsuyui Miyauchi: "ESTIMATION OF STRENGTHENING EFFECTS WITH CARBON FIBER SHEET FOR CONCRETE COLUMN" Non-Metallic(FRP)Reinforcement for Concrete Structures,Proc.of 3rd Int.Sym.Vol.1. 217-224 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinzo Nishibayashi: "A Study on Flow Behavior of High-Fluidity Concrete with a Visocity Agent" International Conference on Engineering Materials,CSCE and JSCF. Vol.1. 401-412 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮内 克之: "CFRPシートでせん断補強した鉄筋コンクリートはりのせん断挙動" コンクリート工学年次論文集. 19・2. 1605-1610 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 井上 正一: "水中におけるRCはりのせん断疲労挙動" コンクリート工学年次論文集. (掲載決定). (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小林 和夫: "RC・PC構造物の設計に関する現状と今後の展望" 土木学会, 127 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤井 学: "コンクリート構造の設計・施工の基本 設計編" 土木学会関西支部, 485 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Katsuyuki Miyauchi: "Shear Behavior of Reinforced Concrete Beam Strengthened with CFRP Sheet" Proc.of the JCI. Vol.19, Nol.2. 1605-1610 (1977)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Katsuyuki Miyauchi: "Estimation of Strengthening Effects with Carbon Fiber Sheet for Concrete Column" Non-Metallic (FRP) Reinforcement for Concrete Structures, Proc.of the Third Internal Symposium. Vol.1. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Manabu Fujii: "Fatigue" Fundamentals of Design and Concrete Structures, KANSAI Branch of JSCE. 329-347 (1977)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shoichi Inoue: "Fatigue limit state" Concrete Engineering Series 22, JSCE. 72-82 (1977)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Sakata: "Creep and Shrinkage of Concrete" Concrete Engineering Series 24, JSCE. 1-16,26 (1977)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shoichi Inoue: "Shear Fatigue Behavior of Reinforced Concrete Beams in Water" Proc.of JCI. (be in the press). (1998)

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

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Published: 1999-03-16  

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