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Development of an existing bridge management method based on load rating

Research Project

Project/Area Number 21H01415
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionSaitama University

Principal Investigator

Okui Yoshiaki  埼玉大学, 理工学研究科, 教授 (40214051)

Co-Investigator(Kenkyū-buntansha) 党 紀  埼玉大学, 理工学研究科, 准教授 (60623535)
松本 泰尚  埼玉大学, 理工学研究科, 教授 (90322023)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥15,340,000 (Direct Cost: ¥11,800,000、Indirect Cost: ¥3,540,000)
Fiscal Year 2023: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
Keywords橋梁維持管理 / 耐荷力評価 / 実態交通荷重 / 振動モニタリング / リダンダンシー / 活荷重係数 / ロード・レイティング / 信頼性指標 / 既設橋維持管理 / トラス橋 / 損傷評価 / モニタリング / 維持管理 / 耐荷力 / 定期点検 / 橋梁の維持管理 / 荷重シミュレーション
Outline of Research at the Start

本研究ではLoad rating手法を用いた既設橋の維持管理のための耐荷力評価手法を検討し, 維持管理の枠組みの構築とマニュアル化を目的とする.H26年の道路橋定期点検要領により5年に1回の近接目視点検と健全度評価が義務づけられた.しかし,健全度と耐荷性能や使用性などの性能とを関連づける手法・マニュアル・枠組みなどが,確立されていない.本研究ではLoad ratingのための点検結果と耐荷性能の関連づけを行い,実態交通荷重の発生確率やシステム・リダンダンシーの効果,構造モニタリングなどの最新の知見を用いて既設橋の性能評価のための枠組みを構築し,マニュアルの作成を行う.

Outline of Final Research Achievements

This study investigated a load rating method for existing bridges and aimed to establish a framework of the load rating method. To achieve this goal, the followings were implemented:
(1) Case studies on the load rating of girder and truss bridges, (2) Proposal of condition factors to consider strength reduction due to damage to the members in truss bridges,(3) Proposal of evaluation methods for system redundancy and system factors, (4) Case studies on system redundancy evaluation for girder and truss bridges,(5) Examination of live load factors based on actual traffic conditions, (6) Examination of live load factors for load rating of existing bridges assuming regular inspections, (7) Evaluation of safety indices of existing bridges and examination of minimum necessary safety margins.

Academic Significance and Societal Importance of the Research Achievements

研究成果の学術的意義として,(1)システム係数の提案,(2)既設橋のLoad rating用の活荷重係数提案の2点が優れている.(1)ではリダンダンシーのメカニズムを解析結果用いて示し,リダンダンシーを定量化するためにシステム係数を提案している.(2)はETCの車種データ+荷重計データなどから得られた実態交通荷重の情報を用いて,活荷重係数を極値統計学の手法を用いて推定している.そのため再現期間に応じた荷重レベル,標準偏差などの算定が可能で,安全余裕度の解析など今後の研究波及効果が大きい.社会的意義としては国内の約70万の既設橋梁の安全性をコストを抑えつつ担保することは重要である.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (9 results)

All 2024 2023 2022 2021

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

  • [Journal Article] System redundancy of steel I‐girder bridges and proposal of a system factor for load rating2023

    • Author(s)
      Okui Yoshiaki, Denda Makoto, Kumaki Kazuki, Sakuma Satoshi
    • Journal Title

      ce/papers

      Volume: 6 Issue: 3-4 Pages: 964-969

    • DOI

      10.1002/cepa.2276

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Investigation into vibration-based structural damage identification and amplitude-dependent damping ratio of reinforced concrete bridge deck slab under different loading states2023

    • Author(s)
      Gohar, S., Matsumoto, Y., Maki, T., Sakuma, S.
    • Journal Title

      Journal of Civil Structural Health Monitoring

      Volume: 13 Issue: 1 Pages: 133-148

    • DOI

      10.1007/s13349-022-00625-w

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A study on live load factor considering actual traffic load for evaluation of existing bridges2023

    • Author(s)
      笠松 徹、奥井 義昭、木村 正志、狩野 亮太、佐久間 智、時田 英夫
    • Journal Title

      Journal of Structural Engineering, A

      Volume: 69A Issue: 0 Pages: 58-68

    • DOI

      10.11532/structcivil.69A.58

    • ISSN
      1881-820X
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A proposal for evaluation method of system redundancy and system factors in load rating of steel bridges2022

    • Author(s)
      奥井 義昭, 傳田 諒, 熊木 和輝, 佐久間 智
    • Journal Title

      Journal of Structural Engineering, A

      Volume: 68A Issue: 0 Pages: 1-10

    • DOI

      10.11532/structcivil.68A.1

    • ISSN
      1881-820X
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Load Ratingを用いた既設橋梁の耐荷性能評価に関する一検討2021

    • Author(s)
      笠松 徹, 奥井 義昭, 石橋 正博, 山川 創
    • Journal Title

      土木学会論文集A1(構造・地震工学)

      Volume: 77 Issue: 3 Pages: 418-426

    • DOI

      10.2208/jscejseee.77.3_418

    • NAID

      130008119326

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] System Redundancy in Load Rating and Vulnerability of I-Girder Bridges2024

    • Author(s)
      Yoshiaki Okui
    • Organizer
      3rd International Conference on Advances in Civil and Environmental Engineering
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 非合成連続鈑桁橋のシステムリダンダンシーと既設橋の耐荷力評価のためのシステム係数の検討2022

    • Author(s)
      奥井 義昭,熊木 和輝,佐久間 智
    • Organizer
      土木学会全国大会年次学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Damage investigation through dynamic characteristics of existing bridge deck panels2022

    • Author(s)
      Gohar, S., Matsumoto, Y., Sakuma, S.
    • Organizer
      IABSE (International Association of Bridge and Structural Engineering) Symposium Prague 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 合理化研究部会報告ー設計合理化と維持管理に向けたLoad Ratingの試みー2022

    • Author(s)
      奥井義昭
    • Organizer
      第25回土木鋼構造研究シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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