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Strength of Folded Plate Structures with Shallow Angle and Its Realization for Practical Use

Research Project

Project/Area Number 01850100
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 土木構造
Research InstitutionTohoku University

Principal Investigator

KURANISHI Shigeru  Tohoku University, Dept. Civil Eng., Professor, 工学部, 教授 (70005221)

Co-Investigator(Kenkyū-buntansha) NAKAZAWA Masatoshi  Tohoku University, Dept. Civil Eng., Research Associate, 工学部, 助手 (20198063)
IWAKUMA Tetsuo  Tohoku University, Dept. Civil Eng., Associate Professor, 工学部, 助教授 (60120812)
Project Period (FY) 1989 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsFolded-Plate Sturcture / Folded Angle / Plate Girder / Bending Strength / Shear Strength / Compressive Strength / 折れ角度 / 座屈強度 / 後座屈 / 終局強度解析
Research Abstract

As a result of linear buckling analysis for the plate girder with folded web, it is found that the buckling strength is reasonably enhanced when the folded angle of 15 degrees is employed for bending, 5 degrees for compression. These are also confirmed by the experimental studies using the acryl material, and it is observed that these specimens show the stable behavior even for the post-buckling loading stage.
The ultimate strength analysis is carried out for this folded web girder under bending. The increase of load carrying capacity is confirmed in the case of more than 10 degrees of folded angle, and the ultimate strength is also obtained for variable aspect ratio and depth-thickness ratio of folded web panel, which turns out to be stable state with no abrupt reduction of strength.
The longitudinal stiffener of plate girder can be omitted, when the folded web of 15 degrees is employed considering the post-buckling behavior. The design recommendation can be described by the form of lim … More itation of depth-thickness ratio corresponding to the yield stress level of structural steels. The compressive strength design of folded plate is achieved by the present design method for sub-panels between the folded lines when more than 5 degrees of folded angle is maintained. However, it is necessary to conduct more experimental studies using the actual steel material not acryl to confirm the strength property and to present the design procedure in detail.
Finally, the technical problems to fabricate the folded plate are summarized. Since the precision of the folded angle is hardly obtained in the actual fabrication, the allowable range of folded angle must be set in the actual fabrication. Is is necessary to fold the panel in the smaller angle to avoid the spring back of folded angle. Therefore, the range of allowable curvature should be set by considering the thickness of plate, type of steel materials and magnitude of folded angle. Moreover, the influence of residual stresses of plate bending and in-plane components induced by the fold of plate must be investigated. Less

Report

(4 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 倉西 茂: "新しい断面形状のプレ-ト・ガ-ダ-" 土木学会第40回年次学術講演会概要集. 915-916 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 小野寺,倉西,岩熊: "折板構造ウェブの座屈強度について" 土木学会東北支部技術研究発表会概要集. 21-22 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 小野寺,倉西,岩熊: "折板構造ウェブの座屈強度設計について" 土木学会第41回年次学術講演会概要集. 225-226 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 横田,倉西: "折板構造ウェブの強度特性に関する研究" 土木学会東北支部技術研究発表会概要集. 34-35 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 横田,倉西: "折板構造ウェブの強度特性に関する研究" 土木学会第43回年次学術講演会概要集. 210-211 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 中沢,倉西: "折れ板構造鋼板の終局強度特性" 土木学会東北支部技術研究発表会概要集. 68-69 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kuranishi, S.: "A new profile of plate girder section" 40th Annual Conference of JSCE. I-458. 915-916 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Onodera, K.: "Buckling strength of folded web plate" Tohoku Branch of JSCE. 21-22 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Onodera, K.: "Buckling strength design of folded web plate" 41st Annual Conference of JSCE. I-113. 225-226 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yokota, T.: "Strength characteristics of folded web" Tohoku Branch of JSCE. 34-35 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yokota, T.: "Ultimate strength characteristics of folded web plate" 43rd Annual Conference of JSCE. I-78. 210-211 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Nakazawa, M.: "Ultimate strength characteristics of folded-plate panel" Tohoku Branch of JSCE. 68-69 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 中沢 正利・倉西 茂: "折れ板構造鋼板の終局強度特性" 土木学会東北支部技術研究発表会概要集. 68-69 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 小野寺一元: "折板構造ウェブの座屈強度設計について" 土木学会第41回年次学術講演会講演概要集. 第1部. 225-226 (1986)

    • Related Report
      1989 Annual Research Report
  • [Publications] 横田隆: "折板構造ウェブの強度特性に関する研究" 土木学会第43回年次学術講演会講演概要集. 第1部. 210-211 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 倉西茂: "新しい断面形状のプレ-ト・ガ-タ-" 土木学会第40回年次学術講演会講演概要集. 第1部. 915-916 (1985)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2021-12-22  

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