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1994 Fiscal Year Final Research Report Summary

Ductility of Structural Steel Members Governed by Fracture

Research Project

Project/Area Number 04402041
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionUniversity of Tokyo

Principal Investigator

KUWAMURA Hitoshi  University of Tokyo, Faculty of Eng., Assoc.Professor, 工学部, 助教授 (20234635)

Co-Investigator(Kenkyū-buntansha) AKIYAMA Hiroshi  Univ.of Tokyo, Faculty of Eng., Professor, 工学部, 教授 (80010825)
Project Period (FY) 1992 – 1994
KeywordsSteel Structures / Fracture / Plastic Deformation / Safety / Earthquake Resistance
Research Abstract

1. Experimental Simulation of Fracture in Large-Scale Testing
Fracture test was done by using cold-formed square steel tubes. It was found that the fracture process is composed of crack initiation, crack penetration, and final fracture. The mechanical properties represented by uniform elongation and Charpy impact value have a significant influence on the fracture.
2. Crack Initiation Strain
From fracture testing, in which material strength, welding condition, notch shape, size, and loading program are changed, it was found that the crack initiation strain is governed by the uniform strain pertinent to the material. Furthermore, the fact is useful for practice that the crack initiation strain is not affected by size.
3. Seismic Performance of Structures Having Brittle Columns
Dynamic response analysis of steel frames having brittle columns showed that such frames have the risk of dynamic progressive failure. In order to avoid the failure, the frame should be assigned more strength than ordinary ductile frames, and the strength amplification factor is proposed.
4. Design Guide
Design guide to avoid brittle fracture in steel structures during a big earthquake is established on the basis that the fracture is conservatively predicted by the crack initiation.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 桑村仁: "冷間プレス曲げによる鋼板の材質変化とその改善に関する研究" 日本建築学会構造系論文報告集. 444. 125-133 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桑村 仁: "冷間ロール成形角形鋼管の材質とその改善に関する研究" 日本建築学会構造系論文報告集. 453. 171-180 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kuwamura,Hitoshi: "Brittle Fractuve under Repeated High Stresses" Journal of Constructional Steel Research. 29. 5-19 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桑村 仁: "延性き裂発生ひずみに及ぼす冷間塑性加工の影響" 日本建築学会構造系論文報告集. 454. 171-178 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桑村 仁: "延性き裂発生ひずみに及ぼす寸法の影響" 日本建築学会構造系論文集. 458. 119-125 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桑村 仁: "繰返し塑性ひずみを受ける構造用鋼材の疲労-延性破壊遷移" 日本建築学会構造系論文集. 461. 123-131 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 日本建築学会: "鋼管構造の挙動と設計に関する最近の研究" 日本建築学会, 346 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 日本建築学会: "鋼構造新素材と構造特性" 日本建築学会, 150 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kuwamura, Hitoshi: "Experiment on the mechanical properties and their improvement of cold press-bent steel plates" Journal of Struct.Constr.Engng., AIJ. No.444. 125-133 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuwamura, Hitoshi: "Experiment on the mechanical properties and their improvement of cold roll-formed steel columns" Journal of Struct.Constr.Engng., AIJ. No.453. 171-180 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuwamura, Hitoshi: "Brittle fracture under repeated high stresses" Journal of Constructional Steel Research 29, Elsevier Applied Science, England. 5-19 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuwamura, Hitoshi: "Effects of cold-working on the critical strain of fibrous crack initiation" Journal of Struct.Constr.Engng., AIJ. No.454. 171-178 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuwamura, Hitoshi: "Size effect on fibrous crack initiation strain" Journal of Struct.Constr.Engng., AIJ. No.458. 119-125 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuwamura, Hitoshi: "Fatigue-ductile crack transition in structural steel under repeated plastic strain reversals" Journal of Struct.Constr.Engng., AIJ. No.461. 123-131 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Architectural Institute of Japan: Recent research developments in the behaviors and design of tubular structures. Architectural Institute of Japan, 346 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Architectural Institute of Japan: New Materials for steel structures and their mechanical properties. Architectural Institute of Japan, 150 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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