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Development of Seismic Retrofitting Method and Proposal of Seismic Performance Evaluation Method for Steel Bridge Piers Corrected by Heating

Research Project

Project/Area Number 16360231
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural engineering/Earthquake engineering/Maintenance management engineering
Research InstitutionOsaka University

Principal Investigator

KIM You-chul  Osaka University, Joining and Welding Research Institute, Professor, 接合科学研究所, 教授 (20144529)

Co-Investigator(Kenkyū-buntansha) ONO Kiyoshi  Osaka University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 助教授 (60324802)
池内 智行  鳥取大学, 工学部, 助手 (00304197)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥15,000,000 (Direct Cost: ¥15,000,000)
Fiscal Year 2005: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 2004: ¥10,200,000 (Direct Cost: ¥10,200,000)
KeywordsRepair / Reinforcement / Heating correction / Residual imperfection / Buckling strength / Ultimate strength / Buckling mode
Research Abstract

In Hanshin-Awaji earthquake (1995), many members of large steel structures were damaged. After the earthquake, the local buckling deformations of many members were rapidly corrected by heating and pressing. However, correcting large deformation like buckling, the ultimate strength of the members is unknown. So it is necessary to confirm safety and reliability of members corrected by heating.
A series of compressive tests was carried out for virgin cruciform column and one corrected by heating. According to the results, buckling deformation modes of projection panels corrected by heating were variously changed by the degree of residual imperfection. And deformations up to the ultimate situation of corrected projection panels became larger than those of virgin panels. However, the ultimate strength of projection panels corrected by heating was almost equal to those of virgin materials.
To elucidate the reason why the compressive behavior of specimens corrected by heating differs from that … More of virgin specimens, elastic-plastic large deformation analysis was carried out. When considering only residual imperfection, the experimental phenomena could not be simulated. Then considering not only residual imperfection but also the rise of yield stress made by work hardening, the experimental phenomena could be simulated totally. From the analysis, it was elucidated that the reason why the buckling mode of specimens corrected by heating changed was both residual imperfection and the increase of yield stress made by work hardening.
In order to verify the major factors affecting compressive behavior of box column corrected by heating, a series of experiment was carried out and it was simulated by elastic-plastic large deformation analysis. The results were same tendency as the case of cruciform column. It was elucidated that two factors as residual imperfection and increase of yield stress involved in large plastic deformation dominated the compressive behavior of the steel members corrected by heating.
The alternative load test was carried out for the structural model of a bridge pier with considering the knowledge obtained from cruciform column and box column.
According to the results, if heating temperature was made to be under A1 transformation temperature at heating correction, residual imperfection could be largely corrected by using water without spoiling the mechanical properties. Whether the ultimate strength was decreased or not was decided by the magnitude of the local deflection which was remained without completely corrected by heating. Therefore, although the restoration to the original state was desirable to be as complete as possible to the original state, if the complete restoration was difficult, heating correction to the opposite direction of buckling should be performed somewhat larger. Less

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (13 results)

All 2006 2005 2004

All Journal Article (13 results)

  • [Journal Article] 加熱矯正された十字柱突出板の圧縮挙動2006

    • Author(s)
      金 裕哲
    • Journal Title

      鋼構造論文集 13-49

      Pages: 37-42

    • NAID

      130004301309

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 局部座屈損傷を加熱矯正した箱型断面柱の圧縮挙動2006

    • Author(s)
      廣畑幹人
    • Journal Title

      第61回年次学術講演会講演概要集 1(Disc)(CD-ROM)

      Pages: 699-700

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Compressive Behavior of Cruciform Column Projection Panel Corrected by Heating2006

    • Author(s)
      KIM You-Chul
    • Journal Title

      Steel Construction Engineering 13-49

      Pages: 37-42

    • NAID

      130004301309

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Compressive Behavior of Box Column Corrected Local Buckling Damage by Heating2006

    • Author(s)
      HIROHATA Mikihito
    • Journal Title

      Proceedings of 61st Annual Conference of Japan Society of Civil Engineers 1

      Pages: 699-700

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 加熱矯正された十字柱突出板の圧縮挙動2006

    • Author(s)
      金 裕哲
    • Journal Title

      鋼構造論文集 12-49(第49号掲載)

    • NAID

      130004301309

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Ultimate Strength of Cruciform Column Corrected by Heating2005

    • Author(s)
      KIM You-Chul
    • Journal Title

      International Journal of Steel Structures 5-2

      Pages: 167-171

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Ultimate Strength of Cruciform Column Projection Panels Corrected by Heating2005

    • Author(s)
      KIM You-Chul
    • Journal Title

      Proceedings of 3rd International Symposium on Steel Structures ISSS'05 1

      Pages: 163-169

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Ultimate Strength of Cruciform Column Projection Panels Corrected by Heating2005

    • Author(s)
      KIM You-Chul
    • Journal Title

      Proceedings of 3rd International Symposium on Steel Structures ISSS'05, 1

      Pages: 163-169

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 加熱矯正が十字柱突出板の座屈および終局強度に及ぼす影響2004

    • Author(s)
      金 裕哲
    • Journal Title

      鋼構造論文集 11-44

      Pages: 57-62

    • NAID

      130004301266

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Safety Evaluation of Cruciform Columns Corrected by Heating2004

    • Author(s)
      KIM You-Chul
    • Journal Title

      Transaction of JWRI 33-1

      Pages: 53-58

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of Heating Correction on Buckling and Ultimate Strength of Cruciform Column Projection Panels2004

    • Author(s)
      KIM You-Chul
    • Journal Title

      Steel Construction Engineering 11-44

      Pages: 57-62

    • NAID

      130004301266

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Safety Evaluation of Cruciform Columns Corrected by Heating2004

    • Author(s)
      KIM You-Chul
    • Journal Title

      Transactions of JWRI 33-1

      Pages: 53-58

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Safety Evaluation of Cruciform Columns Corrected by Heating2004

    • Author(s)
      KIM You-Chul
    • Journal Title

      Trans.of JWRI 33-1

      Pages: 53-58

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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