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1986 Fiscal Year Final Research Report Summary

Investigation into Hysteretic Behavior of Tubular Trusses with Flexible Joints

Research Project

Project/Area Number 60550398
Research Category

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

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionKumamoto University

Principal Investigator

KUROBANE Yoshiaki  Professor, Faculty of Engrg., Kumamoto Univ., 工学部, 教授 (30040372)

Co-Investigator(Kenkyū-buntansha) OCHI Kenshi  Assistant, Faculty of Engrg., Kumamoto Univ., 工学部, 助手 (20145288)
YAMANARI Minoru  Assistant, Faculty of Engrg., Kumamoto Univ., 工学部, 助手 (90166760)
OGAWA Koji  Associate Professor, Faculty of Engrg., Kumamoto Univ., 工学部, 助教授 (80112390)
MAKINO Yuji  Associate Professor, Faculty of Engrg., Kumamoto Univ., 工学部, 助教授 (70040433)
Project Period (FY) 1985 – 1986
KeywordsCircular Tube / Truss / Tubular Joint / Buckling / Ultimate Capacity / Deformation Capacity / Hysteretic Behavior / 耐震設計
Research Abstract

Trusses of thin-walled tubular members are known to be strong, stiff and light, but show limited energy absorbing capacity under dynamic loads with the exception of highly redundant trusses. The ultimate capacity and ductility of circular tubular trusses under large alternating deflection are the subject of this study.
Tests have been conducted on complete trusses of tubular members with welded K-joints under cyclic loading. Observed modes of failure include buckling of braces and failure of joints, which occurred in interaction as the cycling progressed. Interests are focused on the effective length for braces, the post-buckling behavior of braces and trusses, and the participation of joints in failure of trusses.
The following conclusions may be drawn from this study.
1. All the trusses studied here showed stable ductility without sharp decay in resistance after buckling of the braces, because the chords possessed a considerable reserve of capacity. Making the chords relatively strong in a truss is advantageous to avoid occurrences of brittle failure due to damages concentrated on the most critical panels of the truss during earthquake motions.
2. The buckling and post-buckling behavior of the braces was able to be clarified fairy well and was incorporated in the nonlinear frame analysis. The point-hinge analysis was found to be a powerful tool to interpret hysteretic behavior of the truss and be readily applicable to a dynamic analysis. It is worthwhile to note that the point-hinge analysis was conducted on a micro computer in this study.
3. Since the resistance of joints deteriorates due to buckling of braces, the joints should be designed to have a greater capacity than the buckling capacity of the braces. However, it is tolerable that the joints sustain modest damages under severe earthquake excitations because joints show significant ductility.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Kurobane,Yoshiaki: Thin-Walled Structures,and International Journal. 4. 23-40 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小川厚治: 日本建築学会大会学術講演梗概集. 構造【II】. 923-928 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 越智健之: 日本建築学会大会学術講演梗概集. 構造【II】. 1119-1120 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 仲宗根淳: 日本建築学会中国・九州支部研究報告. 7. (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Makino,Yuji: Proceedings of International Meeting on Safety Criteria in Design of Tubular Structures. 417-426 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ogawa,Koji: proceedings of Offshore Technology Conference. (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kurobane, Yoshiaki: "Local Buckling of Braces in Tubular K-Joints" Thin-Walled Structures, an Int. Jl.4. 23-40 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogawa, Koji: "Tests of Tubular Trusses with Welded K-Joints----Part 1 Test Procedure, Part 2 Test Results, Part 3 Analysis and Discussions" Summary Papers, Annual Conf. of Architectral Institute of Japan. Structures II. 923-928 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ochi, Kenshi: "Deformation Capacity of Cold-Formed Circular Tubular Members" Summary Papers, Annual Conf. of Architectural Institute of Japan. Structures II. 1119-1120 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakasone, Jyun: "Test of Tubular Truss with Slender Web Member" Research Report, Chugoku and Kyushu Branches of Architectural Institute of Japan. 7. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Makino, Yuji: "Strength and Deformation Capacity of Circular Tubular Joints" Proc. Int. Meeting on Safety Criteria in Design of Tubular Structures. 417-426 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogawa, Koji: "Buckling and Post-Buckling Behavior of Complete Tubular Trusses under Cyclic Loading" Proc. Offshore Technology Conf.(1987)

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

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Published: 1988-11-10  

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