PASSIVE CONTROL DESIGN METHOD BASED ON TUNING OF EQUIVALENT STIFFNESS OF VISCO-ELASTO-PLASTIC DAMPERS

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  • KASAI Kazuhiko
    Structural Engineering Research, Tokyo Institute of Technology
  • MINATO Nao
    Dept. of Built Environment, Tokyo Institute of Technology
  • SAKURAI Kaoru
    Dept. of Built Environment, Tokyo Institute of Technology

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  • 粘弾塑性ダンパーの等価剛性調節による制振構造の応答制御手法
  • ネンダンソセイ ダンパー ノ トウカ ゴウセイ チョウセツ ニ ヨル セイシン コウゾウ ノ オウトウ セイギョ シュホウ

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Abstract

A visco-elasto-plastic (VEP) damper that combines in series a visco-elasto device and a friction device shows better performance than either one of the devices. This paper discusses simplified theories on seismic peak response evaluation and preliminary design of the visco-elasto-plastically damped building. They are based on the single-degree-of-freedom (SDOF) idealization of multistory building, and produce the so-called "control performance curve" expressing the peak responses as a function of stiffnesses of all components, based on spectral characteristics of the earthquake. Against the target peak response stipulated, the curve clearly shows necessary stiffness balance between damper and other elements. A rule to convert the SDOF design to multistory design, with a consideration to distribute damper stiffness over the building height, is also presented. Accuracy of the design approach is demonstrated via numerous time history simulations of a wide range of multiple-degrees-of-freedom (MDOF) models.

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