STABILITY OF BUCKLING-RESTRAINED BRACES AFFECTED BY THE OUT-OF-PLANE STIFFNESS OF THE JOINT ELEMENT

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  • TAKEUCHI Toru
    Dept. of Architecture and Building Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • YAMADA Satoshi
    Structural Engineering Research Center, Tokyo Institute of Technology
  • KITAGAWA Madoka
    Tokyo Institute of Technology
  • SUZUKI Kazuaki
    Nippon Steel Corporation
  • WADA Akira
    Structural Engineering Research Center, Tokyo Institute of Technology

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Other Title
  • 構面外剛性の低い接合部による接合された座屈拘束ブレースの座屈安定性
  • 構面外剛性の低い接合部により接合された座屈拘束ブレースの座屈安定性
  • コウメン ガイ ゴウセイ ノ ヒクイ セツゴウブ ニ ヨリ セツゴウ サレタ ザクツコウソク ブレース ノ ザクツアンテイセイ

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Description

Recently, Buckling-restrained-braces (BRB) has been widely used in steel building frames as seismic energy dissipation members. In these braces, connections are designed as rigid in rotation for in-plane direction, while joint rotation subjected to story drift being absorbed by slight angle at the end of plastic area of core plate in restrain tube. On contrary, for out-of-plane direction, it is sometimes difficult to design connection as rigid in rotation, and three-hinge instability including connections and core-end hinges is concerned. If the brace member including connections becomes instable, BRB cannot fulfill its function as energy dissipation devices. In this paper, out-of-plane stiffness of various types of gusset-plate connections including bolted joint system are tested, and required conditions of the connections for stable BRB's action are analyzed and discussed.

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