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Earthquakes and Structures
  Volume 7, Number 6, December 2014, pages 1025-1044
DOI: http://dx.doi.org/10.12989/eas.2014.7.6.1025
 


Optimal placement and design of nonlinear dampers for building structures in the frequency domain
Kohei Fujita, Masatoshi Kasagi, Zi-Qiang Lang, Guo Penfei and Izuru Takewaki

 
Abstract
    In this paper, a systematic technique is proposed for the optimal placement and design of nonlinear dampers for building structures. The concept of Output Frequency Response Function (OFRF) is applied to analytically represent the output frequency response of a building frame where nonlinear viscous dampers are fitted for suppression of vibration during earthquakes. An effective algorithm is derived using the analytical representation to optimally determine the locations and parameters of the nonlinear dampers. Various numerical examples are provided to verify the effectiveness of the optimal designs. A comparison of the vibration suppression performance with that of the frame structure under a random or uniform damping allocation is also made to demonstrate the advantages of the new designs over traditional solutions.
 
Key Words
    optimal damper placement; nonlinear damper; frame structure; earthquake loading; vibration control
 
Address
Kohei Fujita, Masatoshi Kasagi and and Izuru Takewaki: Department of Architecture and Architectural Engineering, Kyoto University, Kyoto 615-8540, Japan

Zi-Qiang Lang, Guo Penfei and Izuru Takewaki: Department of Automatic Control and Systems Engineering, University of Sheffield,
Mappin Street, Sheffield S1 3JD, UK
 

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