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On modal energy in civil structural control

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Abstract

A new control strategy based on modal energy criterion is proposed to demonstrate the effectiveness of the control system in reducing structural earthquake responses. The modal control algorithm combining LQR (linear quadratic regulator) control algorithm is adopted in the discrete time-history analysis. The various modal energy forms are derived by definition of the generalized absolute displacement vector. A preliminary numerical study of the effectiveness of this control strategy is carried out on a 20-storey framed steel structural model. The controlled performance of the model is studied from the perspectives of both response and modal energy. Results show that the modal energy-based control strategy is very effective in reducing structural responses as well as in consuming a large amount of modal energy, while augmentation of additional generalized control force corresponding to the modes that contain little modal energy is unnecessary, as it does little help to improve the controlled structural performance.

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Authors and Affiliations

  1. Department of Civil Engineering, Zhejiang University, Hangzhou, 310027, China

    Miao Pang & Tie-jiong Lou

  2. Department of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China

    Ming Zhao

Authors
  1. Miao Pang
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  2. Tie-jiong Lou
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  3. Ming Zhao
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Corresponding author

Correspondence to Tie-jiong Lou.

Additional information

Project (No. G20050452) supported by the Education Bureau of Zhejiang Province, China

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Pang, M., Lou, Tj. & Zhao, M. On modal energy in civil structural control. J. Zhejiang Univ. Sci. A 9, 878–887 (2008). https://doi.org/10.1631/jzus.A0720055

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  • DOI: https://doi.org/10.1631/jzus.A0720055

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