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Practical application and construction process optimization of technology for improving fatigue resistance of narrow welds in steel plate decks of highway bridges

Research Project

Project/Area Number 19KK0366
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))

Allocation TypeMulti-year Fund
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionOsaka University

Principal Investigator

Hirohata Mikihito  大阪大学, 大学院工学研究科, 准教授 (50565140)

Project Period (FY) 2020 – 2023
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥11,960,000 (Direct Cost: ¥9,200,000、Indirect Cost: ¥2,760,000)
Keywords鋼床版 / 道路橋 / 溶接 / 疲労 / 鋼橋 / 溶接部 / 残留応力 / 鋼構造 / 橋梁 / 最適化 / 熱処理 / 変形
Outline of Research at the Start

道路橋鋼床版の狭隘部位における溶接残留応力分布の特徴解明と,残留応力が耐疲労性に及ぼす影響の解明をシームレスに実施する技術を構築する.また,小型供試体レベルの検討成果を実構造物に展開するための有用なアプローチとして,鋼床版の製作プロセスならびにその中での耐疲労性向上技術の適用条件最適化を試みる.このため,溶接構造物の設計,製作におけるミニマムコスト算定および最適化手法を検討する.

Outline of Final Research Achievements

In this study, research on the application of fatigue resistance improvement using residual stress reduction by local heating, which was developed by the applicant, to welds of narrow structures in steel decks of highway bridges, was conducted in an international joint organization. The research was conducted in cooperation with Prof. Jarmai of the University of Miskolc, Hungary, on the optimization of the construction process and the approach from an economic viewpoint, which are useful for the practical application of this technology. The method to rationally evaluate fatigue durability was also studied in cooperation with Prof. Chang of Chung-Ang University, Seoul, Korea. The obtained results were submitted as international co-authored papers. In addition, we established a continuous cooperative system with the possibility of future development, such as the possibility of applying the method to different structures.

Academic Significance and Societal Importance of the Research Achievements

本研究では,道路橋鋼床版の実寸法を想定した溶接部に対し,局所加熱による残留応力低減を効果的に適用するための条件探索を実施した。また,残留応力低減による耐疲労性向上効果を合理的に評価する手法を提示した。これらの点は,本技術の実用展開に向け,学術的に大きな意義を有する。さらに,橋梁に代表されるインフラ構造物の耐久性向上に資する成果を提示したことは社会的に大きな意義を有する。また,国際共同研究,共著論文の公表を通じて本技術の有用性を国際的にアピールする機会を得たことの意義も大きいと考えられる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2024 2023 2021

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results)

  • [Int'l Joint Research] ソウル中央大学(韓国)2023

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ミシュコルツ大学(ハンガリー)2021

    • Year and Date
      2021-05-26
    • Related Report
      2023 Annual Research Report
  • [Journal Article] Local heating for reducing residual stress and fatigue-performance improvement of welded joints2024

    • Author(s)
      M. Hirohata, K.-H. Chang, T. Suzuki. H. Konishi
    • Journal Title

      Journal of Constructional Steel Research

      Volume: 215 Pages: 108544-108544

    • DOI

      10.1016/j.jcsr.2024.108544

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] An Economical and Mechanical Investigation on Local PWHT for Stiffened Steel Plates in Bridge Structures2021

    • Author(s)
      M. Hirohata, S. Nozawa, K. Jarmai
    • Journal Title

      Applied Mechanics

      Volume: 2-4 Issue: 4 Pages: 714-727

    • DOI

      10.3390/applmech2040041

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 鋼床版の補剛材交差部における溶接残留応力低減のための局所加熱条件に関する解析的検討2023

    • Author(s)
      中谷紘人,廣畑幹人,Chang Kyong-Ho,冨永周佑,小西英明,鈴木俊光
    • Organizer
      令和5年度土木学会全国大会第78回年次学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 鋼床版の補剛材交差部に対する局所加熱による溶接残留応力低減の施工性に関する基礎的検討2023

    • Author(s)
      冨永周佑,中谷紘人,廣畑幹人,小西英明,鈴木俊光
    • Organizer
      令和5年度土木学会全国大会第78回年次学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Residual Stress Reduction of Gusset Welded Joints by Local Induction Heating and Its Effect on Fatigue Life Improvement2023

    • Author(s)
      M. Hirohata, F. Jiang, T. Suzuki, H. Konishi, S. Tominaga. C-H. Lee, K-H. Chang
    • Organizer
      The 12th International Symposium on Steel Structures
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Effect of Reduced Residual Stress on Fatigue Life by Heating Method2023

    • Author(s)
      N. K. Sazid, K-H. Chang, M. Hirohata, S. Muzaffer
    • Organizer
      The 12th International Symposium on Steel Structures
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Life cycle cost analysis on anti-corrosion coatings for steel bridges in Japan2021

    • Author(s)
      M. Hirohata, T. Nakahara, K. Jarrmai
    • Organizer
      MultiScience -XXXI. microCAD International Multidisciplinary Scientific Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2020-02-06   Modified: 2025-01-30  

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