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An Indicator of Ultimate Strength Verification for Existing Concrete Structures Subjected to Frost Damage

Research Project

Project/Area Number 19K15062
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22010:Civil engineering material, execution and construction management-related
Research InstitutionHokkai-Gakuen University

Principal Investigator

Kanazawa Takeru  北海学園大学, 工学部, 講師 (80823773)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords鉄筋コンクリート部材 / 凍害 / せん断耐力 / 曲げ耐力 / 極限解析 / 鉄筋コンクリート棒部材 / 劣化深度 / 鉄筋コンクリート / 橋梁 / 有限要素解析
Outline of Research at the Start

本研究では,凍害の劣化深度がRC部材の耐荷機構に及ぼす影響を体系的に明らかにし,設計時に想定した破壊形式を変化させる深度を耐力照査指標として確立することを目的としている.部材表面からの劣化の進行は,曲げ/せん断抵抗における有効断面の減少として,耐荷機構に考慮できると考えられる.破壊形式の変化にクリティカルな影響を及ぼす劣化深度を部材諸元(せん断スパン比やせん断補強筋比)と合わせて解析的に把握した上で,実構造物で確認される典型的な劣化パターンから実験変数を絞り込み,工学的汎用性の高い知見を効率的に蓄積することを目指す.

Outline of Final Research Achievements

A mechanical model was developed to analytically calculate the flexural and shear strength of reinforced concrete (RC) members subjected to freeze-damage based on the damage depth obtained from concrete cores sampled from actual structures. Here the analytical model means the hand calculation without using regression approach based on experimental results. The model validation was performed by an actual RC members, which faced the severe frost damage in Hokkaido.
This study enables a simple and quantitative assessment regarding the remedial measures for such structures, by determining distribution of the relative dynamic modulus of elasticity of the sampled cores.

Academic Significance and Societal Importance of the Research Achievements

本研究では,凍害を受けた既設鉄筋コンクリート構造物に対して力学的合理性のある維持管理を行うための指標として,凍害による表面からの劣化深度を考慮可能な力学モデルを構築したものである.本研究の成果により,実構造物のコンクリートコアから得た情報を直接部材耐力に活かすことが可能となった.これにより,凍害に対して,無筋コンクリートの材料劣化に対する耐久性評価のみが行われてきた状況が改善しうると考えている.

Report

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

    (10 results)

All 2022 2021 2020

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Flexural Analysis Combined with Freeze-thaw Depth for Reinforced Concrete Beams and Columns2022

    • Author(s)
      Kanazawa Takeru、Nakamura Takuro、Sakaguchi Junichi、Kawaguchi Kazuhiro
    • Journal Title

      Journal of Advanced Concrete Technology

      Volume: 20 Issue: 1 Pages: 18-29

    • DOI

      10.3151/jact.20.18

    • NAID

      130008144317

    • ISSN
      1346-8014, 1347-3913
    • Year and Date
      2022-01-25
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Kinematic Model for Shear Assessment of RC Short Columns Subjected to Frost Damage2021

    • Author(s)
      Kanazawa Takeru、Ushiwatari Yuji
    • Journal Title

      Journal of Advanced Concrete Technology

      Volume: 19 Issue: 4 Pages: 335-345

    • DOI

      10.3151/jact.19.335

    • NAID

      130008028811

    • ISSN
      1346-8014, 1347-3913
    • Year and Date
      2021-04-22
    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] FLEXURAL ANALYSIS COMBINED WITH FREEZE-THAW DEPTH FOR RC LINEAR MEMBERS2021

    • Author(s)
      KANAZAWA Takeru、NAKAMURA Takuro、SAKAGUCHI Junichi、KAWAGUCHI Kazuhiro
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures)

      Volume: 77 Issue: 4 Pages: 177-186

    • DOI

      10.2208/jscejmcs.77.4_177

    • NAID

      130008119315

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] KINEMATIC MODEL COMBINED WITH FREEZE-THAW DEPTH FOR SHEAR-CRITICAL RC BRIDGE PIER2021

    • Author(s)
      KANAZAWA Takeru、USHIWATARI Yuji
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures)

      Volume: 77 Issue: 1 Pages: 15-24

    • DOI

      10.2208/jscejmcs.77.1_15

    • NAID

      130008000781

    • ISSN
      2185-6567
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Shear strength evaluation of reinforced concrete beams subjected to freeze-thaw action2020

    • Author(s)
      金澤 健、成田 達哉
    • Journal Title

      Journal of Structural Engineering, A

      Volume: 66A Issue: 0 Pages: 703-711

    • DOI

      10.11532/structcivil.66A.703

    • NAID

      130007830402

    • ISSN
      1881-820X
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 既設道路橋床版から切り出したRCはりの曲げ破壊挙動2021

    • Author(s)
      中村拓郎, 金澤健, 坂口淳一, 安中新太郎
    • Organizer
      コンクリート工学年次大会2021(名古屋)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Structural effects of freeze-thaw depth on shear strength of an existing RC bridge pier2021

    • Author(s)
      T. Kanazawa, Y. Ushiwatari, M. Sakoh and R. Kawase
    • Organizer
      Proc. of 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Structural effects of freeze-thaw depth on shear strength of an existing RC bridge pier2021

    • Author(s)
      Kanazawa, T., Ushiwatari, Y., Sakoh, M., and Kawase, R
    • Organizer
      IABMAS2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Shear Strength of Reinforced Concrete Beams under Different Distributions of Frost Damage2020

    • Author(s)
      Takeru Kanazawa, Tatsuya Narita
    • Organizer
      Proceedings of 6th International Conference on Construction Materials (Conmat'20)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Shear strength of reinforced concrete beams under different distributions of frost damage2020

    • Author(s)
      Kanazawa, T. and Narita, T.
    • Organizer
      ConMat’20
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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