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Minimizing the Level of Damage of Structures and Improving their Performance through Optimal Design of Semi-Active Tuned Mass Damper

Chenari, Mohammad Reza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47337 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. The aim of this study is to evaluate the seismic performance of structures using a semi-active tuned mass damper minimizing the amount of structural damage caused by earthquakes. One of semi-active control mechanisms, which has been studied in recent years, is the damper with fluid controlled by a magnetic field (Magnetorehological Damper, MR). These type of dampers react to the magnetic fields that cause significant changes in the behavior of fluid flow. These dampers are acknowledged because of their simplicity, broad operating range as well as not requiring high-power energy sources. In this thesis, a MR damper is used instead of the existing viscous element of tuned mass damper. To enhance its performance The dynamic model of Bouc-Wen and the Groundhook semi-active control algorithm is utilized to control the behavior of semi-active tuned mass damper. To evaluate the seismic performance of this damper, in the first stage, a number of two-dimensional steel moment resisting frames with varying number of bays and stories were designed based on AISC360-10. Story drift, as an effective variable, is considered to define the damage index. Afterwards, mass dampers are added to the generated structural models. Subsequently, structural models equipped with a tuned mass damper only and also in combination with MR element (semi-active damper) are analyzed using nonlinear time history analysies with seven records scaled to the ASCE7-10 spectrum. Then, using damage criteria provided in ATC-13, damage index of structures for optimal parameters for both Tuned mass dampers are calculated. The results show that semi-active tuned mass damper in moderate and strong earthquakes has better seismic performance. Additionally, for a mass ratio of 3%, a semi-active tuned mass damper leads to decrease in damage index by about 10% compared to the tuned mass damper alone
  9. Keywords:
  10. Seismic Performance ; Damage Index ; Magnetorheological Damper ; Semiactive Control ; Semi-Active Tuned Mass Damper

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