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Earthquakes and Structures
  Volume 1, Number 1, March 2010 , pages 43-67
DOI: https://doi.org/10.12989/eas.2010.1.1.043
 


Optimal placement of viscoelastic dampers and supporting members under variable critical excitations
Kohei Fujita, Abbas Moustafa and Izuru Takewaki

 
Abstract
    A gradient-based evolutionary optimization methodology is presented for finding the optimal design of both the added dampers and their supporting members to minimize an objective function of a linear multi-storey structure subjected to the critical ground acceleration. The objective function is taken as the sum of the stochastic interstorey drifts. A frequency-dependent viscoelastic damper and the supporting member are treated as a vibration control device. Due to the added stiffness by the supplemental viscoelastic damper, the variable critical excitation needs to be updated simultaneously within the evolutionary phase of the optimal damper placement. Two different models of the entire damper unit are investigated. The first model is a detailed model referred to as
 
Key Words
    optimal damper placement; evolutionary optimization; viscoelastic damper; critical excitation; stochastic process; supporting stiffness, multi-storey buildings
 
Address
Kohei Fujita: Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
Abbas Moustafa: Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
Izuru Takewaki: Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
 

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