Structural Engineering and Mechanics

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Passive vibration control of plan-asymmetric buildings using tuned liquid column gas dampers

  • Fu, Chuan (College of Architecture, North China University of Technology, Center of Mechanics and Structural Dynamics, Vienna University of Technology)
  • Received : 2009.01.20
  • Accepted : 2009.08.14
  • Published : 2009.10.20
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Abstract

The sealed, tuned liquid column gas damper (TLCGD) with gas-spring effect extends the frequency range of application up to about 5 Hz and efficiently increases the modal structural damping. In this paper the influence of several TLCGDs to reduce coupled translational and rotational vibrations of plan-asymmetric buildings under wind or seismic loads is investigated. The locations of the modal centers of velocity of rigidly assumed floors are crucial to select the design and the optimal position of the liquid absorbers. TLCGD's dynamics can be derived in detail using the extended non-stationary Bernoulli's equation for moving reference systems. Modal tuning of the TLCGD renders the optimal parameters by means of a geometrical transformation and in analogy to the classical tuned mass damper (TMD). Subsequently, fine-tuning is conveniently performed in the state space domain. Numerical simulations illustrate a significant reduction of the vibrations of plan-asymmetric buildings by the proposed TLCGDs.

Keywords

References

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