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Performance Evaluation of Piezoelectric Based Control System to Mitigate the Vibration of Bridges Caused by Traffic Loads and Seismic Excitation

Ghods, Babak | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45024 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. A large number of bridges in Iran are deteriorating under long and heavy traffic loadings, while getting closer to the end of their design life time. Therefore, many of them have been exhibiting various problems such as excessive vibration or large deflection under the normal service loadings. So, mitigating traffic-induced bridge vibration and damages is necessary to extend their efficient period of serviceability. On the other hand, application of active and passive control devices in structural retrofitting have absorbed the attention of many engineers and researchers. In this work, the performance of an active control system made of piezoelectric actuators is investigated in reducing the vibrational amplitude of bridges and increasing their working life time. In that regard, first a single span and a double continuous span bridges with composite deck are modeled. Also, using the Iranian bridge code criteria, two types of truck loading with different passage speed is considered. The modeling details of the structural supports, as well as their sensor placement were investigated. Using different arrangement of actuators in both bridge models, their efficiency in reducing the vibration amplitudes under different loadings (moving mass) is investigated. In a following step, the performance of control system in reducing the response of the single span bridge under moving masses and vertical ground motion (separately and simultaneously) is studied. Finally, a 3-D model of single span bridge is presented and the responses of 3-D and 2-D model under moving loads are compared to each other. Furthermore, the efficiency of control system in suppressing the response of different structural elements of the 3-D model is investigated. The obtained results for the 2-D models show the effectiveness of the control system under moving loads. Also, the controlling system shows a high performance on decreasing mid span deflection and girders reactions during the vertical ground motions. Comparing the results of 2-D and 3D models indicates that the 2-D models are appropriate for estimating the Maximum energy required under the worst loading case. In this work, the OpenSees program is used for the structural modeling and the numerical analyses, while, controllers are designed using MATLAB program
  9. Keywords:
  10. Semiactive Control ; Piezoelectric Materials ; Fatigue ; Dynamic Analysis ; Bridges ; Traffic Loads

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