STABILITY DESIGN OF PLANE STEEL FAMES USING LINEARIZED BUCKLING ANALYSIS : Part 1 A basic framework and application to an unbraced frame

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  • ARAKI Yoshikazu
    Department of Architecture and Architectural Engineering, Kyoto University
  • TAKAGI Jiro
    Department of Civil and Environmental Engineering, Stanford University
  • UETANI Koji
    Department of Architecture and Architectural Engineering, Kyoto University

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Other Title
  • 線形座屈解析を用いた鋼構造平面骨組の座屈設計 : その1 基本的枠組と純ラーメン骨組への適用
  • センケイザクツカイセキ オ モチイタ コウ コウゾウ ヘイメン ホネグミ ノ ザクツセッケイ ソノ 1 キホンテキ ワクグミ ト ジュンラーメン ホネグミ エ ノ テキヨウ

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We present a framework for stability design of plane steel frames using the linearized buckling analysis. The previous approaches using the linearized buckling analysis often underestimates significantly the allowable stress for compressive members. To overcome the difficulty, we employ higher buckling modes and select the members playing crucial roles in the buckling modes. Such members are selected using the sensitivity coefficient of the buckling loads with respect to the flexural stiffness of each member. The reduction of the allowable stress due to coupling of stability and inelasticity is considered only for the selected members. Furthermore, we introduce the concept of design allowable Ioad factor for systematic implementation of the proposed method. The present approach does not need the distinction between braced and unbraced frames. We demonstrate the feasibility of the present method by applying it to an irregular unbraced frame having a slender column.

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