A COLUMN-BASE CAPABLE OF WIDE-RANGE AND ENHANCED-PRECISION CONTROL FOR ITS ROTATIONAL RIGIDITY AND STRENGTH

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  • YAMANISHI Teruaki
    Researcher, Center for Urban Earthquake Eng., Tokyo Institute of Technology, Dr. Eng.
  • KASAI Kazuhiko
    Prof., Structural Engineering Research Center, Tokyo Institute of Technology, Ph. D.
  • TAKAMATSU Takao
    Prof., Faculty of Eng., Hiroshima Institute of Technology, Ph. D.
  • TAMAI Hiroyuki
    Prof., Faculty of Eng., Nagasaki University, Dr. Eng.

Bibliographic Information

Other Title
  • 弾性回転剛性と耐力を広範囲・高精度で調整できる鉄骨柱脚
  • - A study on steel column-base for response control design Part 1 -
  • - 性能指定型設計に対応できる柱脚に関する研究　その1 -

Abstract

An anchor-bolt-yield-type exposed column-base is typically used in low to medium-rise steel buildings. These column-base details are generally designed to consider the semi-rigid rotation spring, that caused by elastic/plastic elongation of anchor bolts. Such semirigid rotation spring stiffness (rotational rigidity) of column-base have a large effect on the seismic behavior of the building.<br>In this paper, the authors proposed new type of column-base, that hysteresis same to a restoring force characteristics of generally type exposed column-base. And more, the new type of column base can controlled rotational rigidity. An experimental study has been carried out on new type of column-base subjected to cyclic loadings, and the following conclusions were drawn.<br>1) Rotational rigidity of column base changed by the adjusting of anchor bolt length & column-base detail. 2) The proposed models of the restoring force characteristics showed good agreement with the experimental results for all specimens. 3) New type of column base having repaired performance, that anchor bolt can changed after the earthquake.

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