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Investigating the Performance of Multiple Tuned Mass Dampers on the Long Span Cable Stayed Bridge Under Multiple Support Excitation

Momeni, Zahra | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 49180 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. Cable stayed bridge are characterized by a long fundamental period, large flexibility, lightweight and low structural damping, which is vulnerable to large amplitude oscillations when excited by earthquake. So, it is important to study the seismic behavior of cable-stayed bridges. Spatial variation of seismic ground motions denotes the differences in amplitude and phase of seismic motions recorded over extended areas. The result of past analyzes indicate that the effect of the spatial variation on the response of bridges can be detrimental. On the other hand, tuned mass dampers (TMDs) or vibration absorbers are small mass-spring-dashpot units calibrated to be in resonance with a particular mode of the structure, with the aim of reducing its associated dynamic response. it was proven that TMDs is an effective devices for controlling structural vibration. Multiple tuned mass damper (MTMD) is proposed for controlling the vibration of structures with variable frequencies. In this study the performance of multiple tuned mass dampers for long-span cable stayed bridges under multiple support excitations is investigated. Six TMD are assigned to the bridge, three of them are placed in vertical direction and others are placed in transversal direction. The ABAQUS software used for modeling and dynamic analysis of the considered cable-stayed bridge. The artificial earthquake records is considered taking into account the distance between the piers of the considered bridge. Dynamic analysis is carried out by applying the displacement time histories to the supports of the bridge. In general, the performance of TMDs are satisfactory
  9. Keywords:
  10. Multiple Support Excitations ; Tuned Mass Damper (TMD) ; Cables Stayed Bridges

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