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Load Carrying Behavior of Partially Prestressed Concrete Beams under Reversed Cyclic Loading and Repair Method of Damaged Beams after Loading

Research Project

Project/Area Number 62550347
Research Category

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

Allocation TypeSingle-year Grants
Research Field コンクリート工学・土木材料・施工
Research InstitutionKyoto University

Principal Investigator

KOBAYASHI Kazuo  Kyoto University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10021586)

Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1987: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsPartially prestressed concrete / Reversed cyclic loading / Mechanical degree of prestress / Lateral confinement / Inelastic performance / Deterioration process / 補修・補強 / 復元力特性 / じん性 / 部機損傷 / 曲げ拘束筋 / 荷重一変位履歴ループ / 部材靱性 / エネルギー消散能
Research Abstract

Partially prestressed concrete beams, in which flexural cracking is permitted under full working loads, were tested under reversed cyclic loading as experienced at earthquake, and their inelastic behavior and deterioration process were compared with those of reinforced and fully prestressed concrete beams. Some tests were also done to study the effect of repair applied to the damaged beams after loading.
Each beam of bxhx1=10x20x160cm was hinged at two ends with a span length of 140cm, and the reversed cyclic flexure was applied at a shear span - effective depth ratio of approximately 4.0.
The main test variables were i) mechanical degree of prestress ( =Apfpy/(Apfpy+Asfsy), in which Ap,fpy: area and yield strength of prestressing bar, As,fsy: area and yield strength of nontensioned deformed bar) : =0-1.0, ii) design strength of concrete : fc'=400, 800kg/cm2, iii) volume ratio of lateral confinement : s=0-2.8%, and iv) yield strength of lateral confinement : fsyh=3200, 14400kg/cm2.
The test results showed that i) load-deflection hysteresis, ductility and energy dissipation as well as beam deterioration were significantly affected by values of , s and fsyh, ii) attainable maximum tensile stress of lateral confinement increased with increasing s/fc' in case of fsyh=14400kg/cm2 , while lateral steel reached its yield strength irrespective of s/fc'-value in case of fsyh=3200kg/cm2, iii) partially prestressing was very effective for preventing degradation of concrete shear resistance under reversed cyclic loading and iv) appropriate repair method was to be selected taking into account inelastic deformation properties in addition to load carrying capacity.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report

Research Products

(8 results)

All Other

All Publications

  • [Publications] Kazuo KOBAYASHI: Proc.of Fifth Canadian Conference on Earthquake Engineering,Ottawa,Canada. 841-848 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 井上晋: 土木学会第42回年次講演会講演概要集第5部. 232-233 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 以後有希夫: 土木学会第43回年次講演会講演概要集第5部. 610-611 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Kazuo KOBAYASHI: "Inelastic Behavior of Partially Prestressed Concrete under Reversed Cyclic Loading" Proc. of Fifth Canadian Conference on Earthquake Engineering, Ottawa, Canada. 841-848 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Susumu INOUE: "Inelastic Deformation Properties of Partially Prestressed Concrete under Reversed Cyclic Loading" Proc. of Forty-second JSCE Annual Meeting. 232-233 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yukio IGO: "Load Carrying Behavior of Partially Prestressed Concrete under Reversed Cyclic Loading" Proc. of Forty-third JSCE Annual Meeting. 610-611 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 以後有希夫: 土木学会第43回年次講演会講演概要集 第5部. 610-611 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Kazuo KOBAYASHI;Susumu INOUE;Toshihiko MATSUMOTO: Proc. of Fifth Canadian Conference on Earthquake Engineering, ottawa, Canada. 841-848 (1987)

    • Related Report
      1987 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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