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Application of Low Amplitude High Frequency Vibrations in Controlling the Seismic Response of Structures

Talebi Kalaleh, Mohammad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49952 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofouei, Fayyaz
  7. Abstract:
  8. In this research, an investigation on application of parametric low amplitude high frequency vibrations In controlling the seismic response of structures is conducted. Evaluation of the influence of proposed control method on reduction of seismic response of structures, determination of stability map for the proposed structural control system and methods to use this control algorithm in a state needless to monitoring of instantaneous state of system (semiactive control) and a state needful to monitoring of instantaneous state of system (active control), is presented. in beginning chapters, the theory of method by extracting the equation of motion, considering oscillatory term in stiffness and by applying control forces in active state, is described. Furthermore after assessment of the stability map of the structural control system, a method for producing oscillatory term in stiffness of the structure without need for monitoring of instantaneous state of system is introduced. Efficiency of the proposed control method and its mathematical properties is evaluated by means of some numerical models. In numerical models time step effects on numerical instability of system and response amplitudes, effect of oscillatory term amplitude on reduction ratio of responses and transfer functions of controlled system, is evaluated. By Using the proposed method, active control of structures to a given reduction in responses is possible. Moreover, using parametric vibrations, the stabilization of long period systems or negative stiffness systems in long-range displacements is possible
  9. Keywords:
  10. Structural Control ; Active Control ; Semiactive Control ; Seismic Response Control ; Low Amplitude High Frequency Vibrations

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