CUMULATIVE DEFORMATION CAPACITY AND STRUCTURAL DUCTILITY FACTOR OF CIRCULAR HOLLOW SECTION STEEL BRACED FRAMES WITH DIFFERENT DIAMETER THICKNESS RATIO

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  • TERAZAWA Yuki
    Dept. of Arch. and Build. Eng., Tokyo Institute of Technology /Japan Society for the Promotion of Science
  • MATSUI Ryota
    Dept. of Arch. and Build. Eng., Tokyo Institute of Technology
  • NAKAMURA Takeshi
    Dept. of Arch. and Build. Eng., Tokyo Institute of Technology
  • TAKEUCHI Toru
    Dept. of Arch. and Build. Eng., Tokyo Institute of Technology

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  • 径厚比の異なる円形鋼管ブレース付鋼構造骨組の累積変形性能と構造特性係数
  • ケイコウヒ ノ コトナル エンケイ コウカン ブレース ツキコウ コウゾウ ホネグミ ノ ルイセキ ヘンケイ セイノウ ト コウゾウ トクセイ ケイスウ

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Abstract

It is concerned that a long-duration earthquake in the future generates fatigue fractures in the steel structural components. The authors have investigated the member fracture of axial members including cold-formed circular hollow sections. According to previous study of steel braced frames, it’s suggested that more ductile structural components should be applied to a steel structure achieving higher seismic performance. On the other hand, it is needed to develop an aseismic design method of a steel braced frame taking member fracture into account of frequent middle or large earthquakes. In this paper, the interaction of cumulative deformation capacity between a circular hollow section brace with different diameter thickness ratio and a steel frame is investigated for extending basic knowledge of ultimate seismic resistance of steel braced frame, using finite element analysis, experiments including shaking table testing and evaluation of ductility factor.

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