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size Effect on compressive Behavior of Plain and Confined Concrete

Research Project

Project/Area Number 07650676
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionAichi Institute of Technology

Principal Investigator

KOIKE Sachio  Faculty of Engineering, Aichi Institute of Technology Associate Professor, 工学部, 助教授 (70064938)

Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1995: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsSize Effect / Compressive Strangth / Plastic Deformation Behavior / Strain Softning / Confined Concrete / Stress-Strain Curve / Ductility / Lateral Reinforcement / 横拘束力 / 応力下降域 / 靱性
Research Abstract

In the present study, following four studies were carried out to examined the size effect on the compressive behavior of concrete prism under uniaxial compression..
1)In the present study, the effects of the specimen size and aggregate size on the inelastic stress-strain behavior of plain and confined concrete were examined. The following statement can be drawn from the study.
a)For air cured plain microconcrete in which the size of aggregate is reduced inproportion to the size of a specimen, the compressive strength increased and the descending portion of stress-strain curve showed more brittle behavior with increasing size of specimen or aggregate.
b)The compressive strength of confined concrete increased with increasing size of specimen when cured in air. On the other hand, the size effect was almost negligible in water cured specimens. The stress-strain curve of confined concrete showed more brittle behavior with increasing size of specimen and degree of such size effectdepended on th … More e spacing of hoops.
2)A series of uniaxial compression tests of confined concretes were carried out to examine the size effects on their compressive behavior. The strength of concrete has been varied from about 300-700 kgf/cm^2 to the ultra-high level of about 1000 kgf/cm^2. Based on the test results, discussion was carried out concerning the effect of specimen size on compressive strength, strain at the peak stress, and stress-strain curves of confined concrete.
3)The effects of specimen size on stress-strain behavior of confined concrete and confined micro-concrete prism are examined. Experimental factors include the section size of specimen (bxb, b=9.7,15,20 and 25cm), the pitch of hoops (proportional pitch and fixed pitch), and the type of hoops (rectangular hoop and rectangular hoop with cross type subtie). The maximum sizes of aggregate are 15mm for normal concrete, and 12,9 and 6mm for microconcrete. Following statements can be drawn from the test results.
a)For the same lateral reinforcement ratio, size effect on the strength of confined concrete with fixed pitch of hoop (S=1.6cm, rectangular hoop) is smaller than thoseof large specimen with proportional pitch of hoop (S=b/6, S=1.6cm for b=9.7cm), but the size effect on the stress-strain behavior is still rather remarkable.
b)The Size effect of stress-strain curves of confined microconcrete are observed, as well as that of normal concrete.
4)The comprete formulas of stress-strain curves of the confined concrete considering specimen sizes are proposed. These formulas considerthe experimental factors including the section size of specimen, the pitch of hoops (proportional pitch), concrete strength and yield strength of hoops. The results from the formulas agree well with the test results. Less

Report

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

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 小池 狭千朗(幸男): "プレーンおよびコンファインドコンクリートの圧縮特性の寸法効果に関する実験的研究" 愛知工業大学研究報告. 31号B. 137-148 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小池 狭千朗(幸男): "横拘束コンクリートの圧縮特性の寸法効果に及ぼす帯筋間隔の影響" コンクリート工学年次論文報告集. 18巻2号. 833-838 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 服部 宏己: "コンファインドコンクリートの寸法効果に及ぼす帯筋間隔と骨材寸法の影響(その1 実験概)" 日本建築学会大会学術講演梗概集(近畿). 大会号 C-2. 479-480 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大澤 潤: "コンファインドコンクリートの寸法効果に及ぼす帯筋間隔と骨材寸法の影響(その2 実験結果と考察)" 日本建築学会大会学術講演梗概集(近畿). 大会号 C-2. 481-482 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小池 狭千朗(幸男): "コンファインドコンクリートの圧縮特性の寸法効果に及ぼす帯筋の形状・間隔と骨材寸法の影響" 愛知工業大学研究報告. 第32号 B. 125-130 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小池 狭千朗(幸男): "寸法効果を反映したコンファインドコンクリートの応力-ひずみ曲線の表示式" 日本建築学会大会学術講演梗概集(関東). 大会号 C-2. 799-800 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Koike et al.: "Size Effect on Compressive vihavior of Plain and Confained Concrete" Bulletin of Aichi Institute of Technology. No.31, B. (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Koike, et al.: "Effect of Size and Slenderness Ratio of Specimen on Stress-Strain Curves of Confined Concrete" Proceedings of the Japan Concrete Institute. Vol.12, No.2. 833-838 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Koike, et al.: "Effect of Pitch of hoop on Size Effect of Stress-Strain Curves of Confined Concrete and Confined Microconcrete Part 1 : Outline of Experiment" Proceedings of the Annual Meeting of AIJ.(Kinnki). C-2. 479-480 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Koike, et al.: "Effect of Pitch of hoop on Size Effect of Stress-Strain Curves of Confined Concrete and Confined Microconcrete Part 2 : Experimental Results and Discussion" Proceedings of the Annual Meeting of AIJ.(Kinki). C-2. 481-482 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Koike, et al.: "Effect of Pitch and Shape of Hoop on Size Effect of Stress-Strain Curve of Confined Concrete and Confined Microconcrete" Bulletin of Aichi Institute of Technology. No.32, B. 125-130 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Koike, et al.: "Formulas of Stress-Strain Curves of Confined Concrete Considering Specimen Size" Proceedings of the Annual Meeting of AIJ.(Kinki). C-2. 799-800 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Koike, et al.: "Formulas of Stress-Strain Curves of Confined Concrete Considering Specimen Sizes, Concrete Strength and Lateral Confinement" Bulletin of Aichi Institute of Technology. No.33, B. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小池狹千朗(幸男): "プレーンおよびコンファインドコンクリートの圧縮特性の寸法効果に関する実験的研究" 愛知工業大学研究報告. 31号 B. 137-148 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小池狹千朗(幸男): "横拘束コンクリートの圧縮特性の寸法効果に及ぼす帯筋間隔の影響" コンクリート工学年次論文報告集. 18巻2号. 833-838 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 服部宏己: "コンファインドコンクリートの寸法効果に及ぼす帯筋間隔と骨材寸法の影響(その1 実験概)" 日本建築学会大会学術講演梗概集(近畿). 大会号 C-2. 479-480 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大澤 潤: "コンファインドコンクリートの寸法効果に及ぼす帯筋間隔と骨材寸法の影響(その2 実験結果と考察)" 日本建築学会大会学術講演梗概集(近畿). 大会号 C-2. 481-482 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小池狹千朗(幸男): "コンファインドコンクリートの圧縮特性の寸法効果に及ぼす帯筋の形状・間隔と骨材寸法の影響" 愛知工業大学研究報告. 第32号 B. 125-130 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小池狹千朗(幸男): "寸法効果を反映したコンファインドコンクリートの応力-ひずみ曲線の表示式" 日本建築学会大会学術講演梗概集(関東). 大会号 C-2. 799-800 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小池狹千朗(幸男): "横拘束コンクリートの圧縮特性の寸法効果に及ぼす帯筋間隔の影響" コンクリート工学年次論文報告集. 18・2. 833-838 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 服部宏己: "コンファインドコンクリートの寸法効果に及ぼす帯筋間隔と骨材寸法の影響(その1 実験概要)" 日本建築学会大会学術講演梗概集(近畿). 大会号. 479-480 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大澤潤: "コンファインドコンクリートの寸法効果に及ぼす帯筋間隔と骨材寸法の影響(その2 実結果果と考察)" 日本建築学会大会学術講演梗概集(近畿). 大会号. 481-482 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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