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Investigating the Behavior of Tall Steel Structure Using Large Mass Ratio Tuned Mass Damper

Maymandi, Mohioddin | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49739 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. Use of high-rise structures has become very common in recent decades for different purposes. Since, these structures are vulnerable to the wind and earthquake loads, many ways have been proposed to reduce or dissipate the input wind or seismic energy to the building structures. In this study, the effect of the tuned mass damper (TMD) with high mass ratio for high-rise structures is investigated. The proper functioning of the TMD to limit the vibrations of a structure is depended on the appropriate adjustment of its mass, stiffness and damping characteristics according to the load and structural specifications. The vibrational characteristics of the structures could change during sever earthquakes. On the other, the frequency content of the earthquake records depends on the site soil type. One of the proposed methods to reduce the sensitivity of TMDs is to increase the mass of the damper. In that regard, this study suggested that a number of top floors of the building to act as a TMD for the whole building. Appropriate application of the base isolation system can be considered as a mean to separate those top stories from the rest of the building. High damping rubber bearing (HDRB) isolators is considered in this study for the base isolation system. For this purpose, two structural models with 8 and 15 stories were considered. In each model, the effect of separating one, two and three top floors on its structural response were investigated. The design of the isolator system was based on the ASCE-7, 2010 criteria. The obtained results indicates the efficiency of this method in reducing the seismic response of the structures. The story displacements and story drifts were reduced and the absolute acceleration and base shear force were decreased for models in which the roof has been considered as the TMD. In the other models these responses were increased slightly. Reduction in the number of plastic hinges indicates that most of energy has been dissipated using the TMD. The SAP2000 was used for nonlinear dynamic analysis and modeling
  9. Keywords:
  10. Tuned Mass Damper (TMD) ; Large Mass Ratio ; Nonlinear Dynamic Analysis ; Structural Control ; Base Isolation ; Seismic Behavior ; High Buildings

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