正方形中空断面部材の局部座屈性状に及ぼす初期不整の影響

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  • 佐藤 公亮
    東京工業大学大学院理工学研究科建築学専攻　博士後期課程・修士（工学）　日本学術振興会特別研究員DC
  • 五十嵐 規矩夫
    東京工業大学大学院理工学研究科建築学専攻　准教授・博士（工学）

書誌事項

タイトル別名
  • EFFECT OF INITIAL IMPERFECTION ON LOCAL BUCKLING BEHAVIOR OF SQUARE HOLLOW SECTION MEMBER
  • セイホウケイ チュウクウ ダンメン ブザイ ノ キョクブザクッセイジョウ ニ オヨボス ショキ フセイ ノ エイキョウ

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抄録

 Square hollow section members, such as square steel tube members and box section members, are commonly used as columns in structural steel buildings. Their performance during earthquakes significantly affects the seismic capacities of buildings. Since local buckling determines the elasto-plastic behavior of the members except for fracture, it is necessary to examine the large deformation behavior governed by local buckling of the members to accurately evaluate the seismic capacities of buildings. However, the effects of initial imperfections owing to the manufacturing process on the elasto-plastic behavior of the members are not well understood. The purpose of this study is to examine the effects of initial imperfections on the large deformation behavior governed by local buckling of the members.<br> The initial imperfections of square hollow section members are examined experimentally. The effects of initial imperfections on the large deformation behavior governed by local buckling of the members are understood by axial compression analysis. The ultimate strength and plastic deformation capacity are derived from analysis and test and the validity of the current values of width‐thickness ratio limitations is examined. It is shown that the geometric imperfections of plate elements significantly affect and other initial imperfections owing to the manufacturing process do not much affect the local buckling behavior of the members.<br> First, the material and geometric imperfections of square hollow section members with different manufacturing processes, steel grades, and cross-sectional shapes are examined experimentally. The specimens are cold roll-formed square steel tube members, cold press-formed square steel tube members, and built-up box section members. Variation of material property in the sections and residual stress of the material imperfections and initial deflection of the plate elements of the geometric imperfections are examined.<br> Then, after understanding the initial imperfections of real members, the effects of material and geometric imperfections on the large deformation behavior of square hollow section members are examined by axial compression analysis of simple loading condition. The effects of the variation of material property in the sections, residual stress, initial deflection of the plate elements, and curvature radius at the corners of the initial imperfections are understood by finite element analysis. The initial deflection of the plate elements significantly affects and the variation of material property in the sections, residual stress, and curvature radius at the corners does not much affect the local buckling behavior of the members. The valid or safe ultimate strength and plastic deformation capacity can be obtained by using the initial deflection corresponding to buckling mode as the only initial imperfection.<br> Finally, based on the understanding of the effects of initial imperfections, the ultimate strength and plastic deformation capacity of square hollow section members under axial compression are examined by analysis and test. It is shown that the values of width‐thickness ratio limitations of the Design Standard for Steel Structures and Recommendations for the Plastic Design of Steel Structures are valid.

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