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Design of Reinforced Concrete External Beam to Column Joints Subjected to Earthquake Loading

Research Project

Project/Area Number 60460174
Research Category

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

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionKyoto University

Principal Investigator

MORITA Shiro  Professor, Faculty of Engineering, Kyoto University, 工学部, 教授 (30025902)

Co-Investigator(Kenkyū-buntansha) KAKU Tetsuzo  Associate Professor, The University of Technology Toyohashi, 建設系, 助教授 (40026092)
FUJII Shigeru  Research Associate, Faculty of Engineering, Kyoto University, 工学部, 助手 (70144334)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1986: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1985: ¥4,300,000 (Direct Cost: ¥4,300,000)
KeywordsBeam-Column Joints / Bi-directional Loading / Two-Way Frame / Seismic Design, Developement Length / 曲げ下げ定着 / 接合部補強 / スラブ効果
Research Abstract

The aim of the project is to provide a proposal for seismic design of external beam-column joints in reinforced concrete two-way framed structures. Tests were performed on bare beam-column assemblages having one-way or two-way beams and slab-beam-column assemblages of two-way frames.
From the test results, following remarks were derived;
1. In external joints, joint shear is transferred mainly by the diagonal compression strut mechanism rather than the truss mechanism. Therefore, horizontal joint hoops are effective to confining concrete struts.
2. Downward bending of bottom beam bars, the standard details of Japanese practice, accelerates the deterioration of joint shear capacity and rigidity.
3. Column axial force improves joint crack capacity and deterioration rate of shear rigidity.
4. Though the unloaded transverse beams are effective to improve the behavior in the direction of the main beam, this effect is cleary lost after the excursion of transverse beams into the plastic deformation range. Simultaneous bi-direction loading of slab-beam-column assemblages increases the energy dissipation capacity in comparison with alternative uni-directional loading.
5. Based on the test results, a seismic design method for external beam-column joints was proposed.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 金田和浩: コンクリート工学年次講演会論文集. 7. 613-616 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 角徹三: コンクリート工学年次講演会論文集. 7. 617-620 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 神野靖夫: 日本建築学会近畿支部研究報告集. 117-120 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 角徹三: コンクリート工学年次講演会論文集. 8. 641-644 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 浅草肇: コンクリート工学年次論文集. 9. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 森田司郎: コンクリート工学年次論文集. 9. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 藤井栄: コンクリート工学年次論文集. 9. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Fujii: Proceedings of Pacific Conference on Earthquake Engineering. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kazuhiro Kanda et al.: "The Effects of joint shear Reinforcement on Behavior on External Beam-Column Joints under Reversed Cyclic Loading." Transactions of the Japan Concrete Institute. 7. 559-566 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Hajime Asakura and Tetsuzo Kaku: "Load Rsisting Mechnism of External Reinforced Concrete Beam-Column Joints. (in Japanese)" Proceedings of Japan Concrete Institute 9th Conference. 9.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shiro Morita et al.: "Deterioration in shear Capacity and shear Rigidity of External Reinforced Concrete Beam-Column Joints under Reversed Cyclic loads. (in Japanese)" Proceedings of Japan Concrete Institute 9th Coference. 9. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Fujii and Shiro Morita: "Behavior of External Reinforced Concrete Beam to Column Joints under Bi-directional Loading Cycles. (in Japanese)" Proceedings of japan Cocrete Institute 9th Conference. 9. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Fujii and Shiro Morita: "Behavior of Reinforced Concrete Beam-Column-Slab Subassemblages under Bi-directional Loading" Proceedings of Pacific Conference on Earthquake Engineering. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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

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