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Improvement of Hysteretic Energy Dissipation of Concrete Members by Multi-yielding Longitudinal Reinforcement

Research Project

Project/Area Number 07455221
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

WATANABE Fumio  Kyoto University, Faculty of Engineering, Professor, 工学研究科, 教授 (50026267)

Co-Investigator(Kenkyū-buntansha) KATO Hiroto  Building Research Institute, Ministry of Construction, Senior Researcher, 第四研究部, 主任研究員
NISHIYAMA Minehiro  Kyoto University, Faculty of Engineering, Assistant, 工学研究科, 助手 (50183900)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1995: ¥6,300,000 (Direct Cost: ¥6,300,000)
Keywordsreinforced concrete / prestressed concrete / hysteretic behavior / energy dissipation / precast concrete / seismic design / seismic response / yield / プレストコンクリート / 降伏 / 柱 / はり / 高強度鉄筋 / 履歴エネルギー
Research Abstract

A new reinforcing method to improve the inelastic behavior of reinforced concrete was proposed. The method combines use of high-strength and ordinary-strength longitudinal bars. When the column is subjected to bending moment, the ordinary strength longitudinal bars yield first and then the high-strength bars yield later in large post-yield range. Up to the stage of yielding of the high-strength bars, the column does not show significant degradation of load-carrying capacity. To confirm the advantages of the new reinforcing method, flexural analyzes on reinforced concrete columns with different grades of longitudinal bars were conducted. The results of the analysis indicate that the combined use of different grades of longitudinal bar improves the inelastic behavior of reinforced concrete columns. An experimental research work on the proposal was also conducted to verify the effectiveness. The parameters used were the ratio of the amount of high-strength reinforcement to that of ordinar … More y-strength reinforcement, the axial load level on the column and bi-directional loading.
A new type of prestressing strand, graded composite strands, has been developed. The seven-wire strand consists of three high-strength wires (a yield stress of 1400 MPa) and four ordinary-strength wires (400 MPa). The high-strength wires provide prestressing force along the member axis even under large deformations. The ordinary-strength wires, which yield during the prestressing operation, are expected to contribute to hysteretic energy dissipation. Therefore, these graded composite strands make precast connections have many of the desirable characteristics of monolithic connections. The effectiveness of the strands is verified by loading tests on beam-to-column connections. Eight external beam-to-column connections were constructed and tested. Four specimens were connected by ordinary prestressing stands and the others were connected by the graded composite strands. The parameters used were the amount of prestressing force introduced and the distance of the location of prestressing strands from the centroidal axis of the beam section. The test results indicate that specimens with graded composite strands had much larger hysteretic energy dissipatiion than did the specimens with the ordinary strands.
Another series of loading tests were carried out on column-to-foundation connections post-tensioned by 'graded composite prestressing steel bars'. The steel bar cross section consists of two parts : normal strength and high strength. Thus, it has a monotonic load-deformation relationship which is better modeled by a trilinear than a bilinear approximation. This nonlinear behavior results in energy dissipation. Nine column-to-foundation connections were constructed using the graded composite steel bars or ordinary prestressing steel bars. However, the test results revealed that the graded composite steel bars were not so effective to increase hysteretic energy dissipation capacity. Less

Report

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

    (20 results)

All Other

All Publications (20 results)

  • [Publications] M. Nishiyama, F. Watanabe and H. Sato.: "Precast Connections Post-tensioned by Graded Composite Steel" Concrete 95 Toward Better Concrete Structures, Conference Papers, Brisbane, Australia. 1. 579-588 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M. Nishiyama, F. Watanabe and H. Muguruma: "The Use of Prestressed Concrete in Building Structures in Japan" The Concrete Future, International Conference'95 Conference Technical Papers, Auckland, New Zealand. 47-56 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 田川、渡辺、西山、佐藤: "プレキャストコンクリート柱・基礎圧着接合部の載荷実験(その1:実験概要)(その2:実験結果の概要)" 日本建築学会大会学術講演梗概集(北海道). C-2. 673-676 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] F. Watanabe, J. Y. Lee and M. Nishiyama: "Structural Performance of Reinforced Concrete Columms with Different Grade Longitudinal Bars" ACI Structural Journal. Vol.92 No.4. 412-418 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 田川、西山: "PC鋼棒の応力度-ひずみ度関係" 日本建築学会大会学術講演梗概集(近畿). C-2. 917-918 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 西山、丹羽、渡辺、六車: "混合ストランドを用いたプレキャスト圧着接合部骨組の履歴性状" コンクリート工学年次講演会論文集. Vol.16 No.2. 811-816 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Nishiyama, F.Watanabe and H.Sato: "Precast Connections Post-tensioned by Graded Composite Steel" Concrete 95 Toward Better Concrete Structures, Conference Papers, Brisbane, Australia. Vol.1. 579-588 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Nishiyama, F.Watanabe and H.Muguruma: "The Use of Prestressed Concrete in Building Structures in Japan" The Concrete Future, International Conference '95, Conference Technical Papers, Auckland, New Zealand. 47-56 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Tagawa, F.Watanabe, M.Nishiyama and H.Sato: "Loading Tests on Precast Concrete Column-to-foundation Connection Post-tensioned by Prestressing Steel Bars" Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan. C-2. 673-676 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] F.Watanabe, J.Y.Lee and M.Nishiyama: "Structural Performance of Reinforced Concrete Columns with Different Grade Longitudinal Bars" ACI Structural Journal. Vol.92, No.4. 412-418 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] H.Tagawa and M.Nishiyama: "Stress-Strain Relationship of Prestressing Steel Bars" Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan. C-2. 917-918 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Nishiyama, Y.Niwa, F.Watanabe and H.Muguruma: "Load-Displacement Characteristics of Precast Beam to Column Subassemblage Post-Tensioned by Composite Strands" Proceedings of the Japan Concrete Institute. Vol.16, No.2. 811-816 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Nishiyama,F.Watanabe and H.Sato: "Precast Connections Pcst-tensioned by Graded Composite Steel" Concrete 95 Toward Better Concrete Structurs,Conference Papers,Brishane,Australia. 1. 579-588 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Nishiyama,F.Watanabe and H.Muguruma: "The Use of Prestressed Concretein Building Structures in Japan" The Concrete Future,International Conference'95 Conference Technical Papers,Auckland,New Zealand. 47-56 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 田川,渡辺,西山,佐藤: "プレキャストコンクリート柱・基礎圧着接合部の載荷実験(その1:実験概要)(その2:実験結果の概要)" 日本建築学会大会学術講演梗概集(北海道). C-2. 673-676 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] F.Watanabe,J.Y.Lee and M.Nishiyama: "Structural Performance of Reinforced Concrete Columns with Different Grade Longitudinal Bars" ACI Structural Journal. Vol.92 No.4. 412-418 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 田川,西山: "PC鋼棒の応力度-ひずみ度関係" 日本建築学会大会学術講演梗概集(近畿). C-2. 917-918 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 西山,丹羽,渡辺,六車: "混合ストランドを用いたプレキャスト圧着接合部骨組の履歴性状" コンクリート工学年次講演会論文集. Vol.16 No.2. 811-816 (1994)

    • Related Report
      1996 Annual Research Report
  • [Publications] F. Watanabe: "Structural Performance of Reinforced Concrete Columns with Different Grade Longitudinal Bars" ACI Structural Journal. 92. 412-418 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] M. Nishiyama: "Precast Connections Post-tensioned by Graded Composite Steel" Concrete 95 Touard Better Concrete Structures, Confevence Papers, Brisbane Australia. I. 579-588 (1995)

    • Related Report
      1995 Annual Research Report

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

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