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Detailed examination on steel strain rate for steel structures subjected to fire and developments of upgrading of fire resistant design

Research Project

Project/Area Number 18K04429
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 23010:Building structures and materials-related
Research InstitutionNagoya University

Principal Investigator

Ozaki Fuminobu  名古屋大学, 環境学研究科, 准教授 (40434039)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords耐火 / 鋼構造 / ひずみ速度 / 高温曲げ実験 / 高温座屈実験 / 高温曲げ強度 / 高温座屈耐力 / 崩壊温度 / 鋼材ひずみ速度 / 加熱速度 / 載荷重速度 / 鋼構造耐火 / 高温座屈 / 建築構造
Outline of Final Research Achievements

The bending strength, flexural buckling strength, and collapse temperature of steel members were examined by steady and transient state tests with various heating and deformation rates to clarify relationships between those fire resistance and steel strain rate. The stress-strain relationships for mild steels at elevated temperatures were obtained by coupon tests under three strain rates. A bending test using a beam specimen was conducted to examine the effects of the deformation rates under steady-state conditions and the heating rates under transient state conditions. Flexural buckling tests were conducted under steady-state and transient-state conditions. It was clarified that the bending strength and collapse temperature are evaluated by the full plastic moment using the effective strength under fast strain rates. The flexural buckling strength and collapse temperature are approximately evaluated by the buckling strength using 0.002-offset yield strength under a slow strain rate.

Academic Significance and Societal Importance of the Research Achievements

本研究でひずみ速度の実態が解明されることで、現行高温素材試験の画一的なひずみ速度設定値が持つ工学的意味と問題点を明らかにし、建築耐火向けの新試験法の提案を目指した。高温曲げ強度はひずみ速度が大きな場合(3or7%/min.)のひずみ2%時応力の有効降伏強度、高温全体座屈はひすみ速度が小さな場合(0.3%/min.)の0.2%offset耐力で評価可能であることが分かった。通常試験のひずみ速度は全体座屈評価に、一方、試験途中でひずみ速度を上昇させた鋼材強度は高温曲げ強度に対応可能で、現行の素材試験結果を活用し、試験途中にひずみ速度を意図的に上げるという新試験法で、梁と柱の高温強度が評価できる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (18 results)

All 2020 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (10 results) (of which Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] Ruhr-Universiteat Bochum(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] ルール大学ボーフム校(ドイツ)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Studies on bending strength and collapse temperature of a steel beam considering effects of steel strain rate and heating rate at elevated temperatures2020

    • Author(s)
      Fuminobu OZAKI and Takumi Umemura
    • Journal Title

      PROCEEDINGS of The 11th International Conference on Structures in Fire(Sif2020)

      Volume: - Pages: 639-649

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 荷重一定・温度漸増下において加熱速度が鋼部材の崩壊温度に及ぼす影響2020

    • Author(s)
      尾崎文宣、梅村巧
    • Journal Title

      日本建築学会大会学術講演梗概集(関東)

      Volume: - Pages: 95-96

    • Related Report
      2020 Annual Research Report
  • [Journal Article] 温度一定・荷重漸増下において載荷速度を変化させた 場合の鋼部材高温耐力評価2020

    • Author(s)
      岡田陽奈乃 梅村巧 尾崎文宣
    • Journal Title

      日本火災学会研究発表会梗概集

      Volume: - Pages: 119-120

    • Related Report
      2020 Annual Research Report
  • [Journal Article] 鋼材ひずみ速度が建築鋼部材の耐火性能に及ぼす効果 -ひずみ速度を考慮した鋼材高温時応力~ひずみ関係の定式化と片持梁の面内数値解析-2020

    • Author(s)
      梅村巧, 尾崎文宣
    • Journal Title

      日本建築学会構造工学論文集

      Volume: Vol.66B

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects that change in strain ratio causes to structural fire resistance of a steel member: Formulation of stress-strain relationships considering effects of strain ratio and verification based on in-plane analyses2019

    • Author(s)
      Takumi Umemura,Fuminobu OZAKI
    • Journal Title

      PROCEEDINGS Steel Structures with Resilience and Sustainability

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] 鋼材ひずみ速度の影響を考慮した高温時応力ひずみ関係式の提案2019

    • Author(s)
      梅村巧, 尾崎文宣
    • Journal Title

      日本建築学会大会学術講演梗概集(北陸)

      Volume: 防火 Pages: 1-2

    • Related Report
      2019 Research-status Report
  • [Journal Article] Effects that change in strain ratio causes to structural fire resistance of a steel member: Formulation of stress-strain relationships considering effects of strain ratio and verification based on in-plane analyses2019

    • Author(s)
      Fuminobu OZAKI, Takumi Umemura
    • Journal Title

      Advances in Engineering Materials, Structures and Systems:Innovationsm, Mechanics and Applications

      Volume: - Pages: 1932-1936

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects that Change in Strain Ratio Causes to Structural Fire Resistance of a Steel Member - Formulation of Stress-Strain Relationships consid-ering Effects of Stain Ratio and Verification based on In-plane Analyses -2019

    • Author(s)
      Fuminobu Ozaki Takumi Umemura
    • Journal Title

      Insights and Innovations in Structural Engineering, The 6th International Conference on Structural Engineering, Mechanics and Computation

      Volume: 印刷中

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects that Change in Strain Ratio Causes to Structural Fire Resistance of a Steel Member - Formulation of Stress-Strain Relationships consid-ering Effects of Stain Ratio and Verification based on In-plane Analyses -2019

    • Author(s)
      Takumi Umemura Fuminobu Ozaki
    • Journal Title

      12th Pacific Structural Steel Conference

      Volume: 印刷中

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 高温時における鋼材のひずみ速度変化が鋼部材の耐火性能に及ぼす影響-片持梁の面内解析による検討-2018

    • Author(s)
      尾崎文宣
    • Journal Title

      日本建築学会大会学術講演梗概集(東北)

      Volume: 防火 Pages: 293-294

    • Related Report
      2018 Research-status Report
    • Open Access
  • [Presentation] Studies on bending strength and collapse temperature of a steel beam considering effects of steel strain rate and heating rate at elevated temperatures2020

    • Author(s)
      Fuminobu Ozaki
    • Organizer
      The 11th International Conference on Structures in Fire(Sif2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 温度漸増下において加熱速度が鋼部材の崩壊温度に及ぼす影響2020

    • Author(s)
      尾崎文宣
    • Organizer
      日本建築学会大会学術講演(関東)
    • Related Report
      2020 Annual Research Report
  • [Presentation] Effects that change in strain ratio causes to structural fire resistance of a steel member: Formulation of stress-strain relationships considering effects of strain ratio and verification based on in-plane analyses2019

    • Author(s)
      Takumi Umemura,Fuminobu OZAKI
    • Organizer
      PSSC'19 TOKYO The 12th Pacific Structural Steel Conference
    • Related Report
      2019 Research-status Report
  • [Presentation] 鋼材ひずみ速度の影響を考慮した高温時応力ひずみ関係式の提案2019

    • Author(s)
      梅村巧, 尾崎文宣
    • Organizer
      日本建築学会大会学術講演
    • Related Report
      2019 Research-status Report
  • [Presentation] Effects that change in strain ratio causes to structural fire resistance of a steel member: Formulation of stress-strain relationships considering effects of strain ratio and verification based on in-plane analyses2019

    • Author(s)
      Fuminobu OZAKI, Takumi Umemura
    • Organizer
      The 7th international conference on structureal engineering, mechanics and computation
    • Related Report
      2019 Research-status Report
  • [Presentation] 高温時における鋼材のひずみ速度変化が鋼部材の耐火性能に及ぼす影響-片持梁の面内解析による検討-2018

    • Author(s)
      尾崎文宣
    • Organizer
      日本建築学会大会学術講演梗概集(東北)
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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