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A new seismic retrofit technique for mid- and high-rise RC and SRC buildings

Research Project

Project/Area Number 19K22009
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 23:Architecture, building engineering, and related fields
Research InstitutionMeijo University (2020-2021)
Nagoya Institute of Technology (2019)

Principal Investigator

Ichinose Toshikatsu  名城大学, 理工学部, 教授 (10151474)

Project Period (FY) 2019-06-28 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords鉄筋コンクリート / 耐震補強 / 破壊 / 鉄骨鉄筋コンクリート / 梁断面 / 終局強度 / 破壊モード / 軸力伝達機構 / 高強度コンクリート / 地震被害 / 建物 / 鉄骨ブレース
Outline of Research at the Start

研究は4体の縮小試験体で行う。実験パラメータは,補強方法(鉄筋コンクリート壁,鉄骨ブレース),新補強の有無の2種類である。新補強のない試験体では,ひずみの集中により,小さな変形で柱の鉄筋の座屈と破断が生じるものと予測される。新補強のある試験体では,ひずみが分散し,大きな変形まで強度を維持するものと期待される。
本研究で指摘しようとしている問題は,「曲げ降伏型にすれば変形性能が高まる」という世界共通の常識を覆すものである。よって,挑戦的研究としての意義を有すると考える。

Outline of Final Research Achievements

Reinforced concrete (RC) and steel reinforced concrete (SRC) structures that were constructed decades ago often have detrimental seismic capacity and have been retrofitted. Although most of the retrofitted buildings survived the 2011 Great East Japan Earthquake, some mid- and high-rise RC and SRC buildings suffered severe damages in spite of retrofit. Such damages were caused by the concentration of tensile strain in columns. In this research, a new technique was proposed and its capacity was confirmed by experiments. The specimens retrofitted by the technique showed spindle-shaped hysteretic curves up to the drift angle of 2%, which indicates large capacity to absorb seismic energy.

Academic Significance and Societal Importance of the Research Achievements

耐震性の低い中高層RC, SRC建物は世界中に数多く存在する。本研究で検討した破壊(ひずみ集中)は,国際地震工学会のジャーナルで論文として紹介され,日本だけでなく海外どこでも起こり得るものとして注目された。なお研究代表者はこの論文の共著者である。今回提案した補強方法は,ひずみの集中を防止し大きな地震エネルギー吸収能力が可能になる。しかも施工コストは高くないと推察される。したがって,今後,全世界での適用が期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (1 results) Remarks (1 results)

  • [Int'l Joint Research] Purdue大学(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] パデュー大学(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] TEST OF JOINTS BETWEEN STEEL CONCRETE GRADE BEAM AND STEEL COLUMN BASE2021

    • Author(s)
      市之瀬 敏勝, 楠原 文雄, 児玉 修祐, 八木 茂治
    • Journal Title

      AIJ Journal of Technology and Design

      Volume: 27 Issue: 66 Pages: 750-755

    • DOI

      10.3130/aijt.27.750

    • NAID

      130008054531

    • ISSN
      1341-9463, 1881-8188
    • Year and Date
      2021-06-20
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A POTENTIAL VULNERABILITY IN HIGH-STRENGTH REINFORCED CONCRETE SHEAR WALL RETROFITS2021

    • Author(s)
      L. Laughery, T. Ichinose, M. Maeda, H. Alwashali
    • Journal Title

      17th World Conference on Earthquake Engineering

      Volume: 3b Pages: 0053-0053

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental Evaluation of Structural Performance of Foundation Beams under RC Shear Walls with Door openings2021

    • Author(s)
      鈴木卓, 真田靖, 市之瀬敏勝, 楠原文雄ほか
    • Journal Title

      Japan Architectural Review

      Volume: 4(1) Issue: 1 Pages: 66-75

    • DOI

      10.1002/2475-8876.12191

    • NAID

      130007777636

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 柱と杭が水平2方向に偏心する杭頭接合部の非線形FEM解析2021

    • Author(s)
      鈴木 卓,市之瀬 敏勝
    • Journal Title

      コンクリート工学年次論文集

      Volume: 43

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 鉄骨ブレーズを曲げ強度にも有効にするRC耐震補強方法の検討2020

    • Author(s)
      市之瀬 敏勝
    • Journal Title

      日本建築学会東海支部研究報告書

      Volume: 58 Pages: 205-208

    • Related Report
      2019 Research-status Report
  • [Presentation] 鉄骨ブレースを曲げ強度にも有効にするRC耐震補強方法の検討2019

    • Author(s)
      市之瀬 敏勝
    • Organizer
      2019年度 日本建築学会東海支部研究集会
    • Related Report
      2019 Research-status Report
  • [Remarks] 日本建築学会

    • URL

      https://www.aij.or.jp/paper/detail.html?productId=628177

    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2023-01-30  

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