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Performance of an Off-center Bracing System Using Smart Piezo Electric Damper

Hosseini, Kasra | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54895 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. OBS1 frame is a concentric bracing system that consists of three elements, and it provides openings for building using a y-form structure. In the present thesis, the OBS system has been accompanied by a smart damping system.The buildings in which this lateral bearing system is employed are considered as SCBF frames. According to design guidelines, seismic performance parameters are required to design these buildings, including response modification coefficient (R), over-strength factor (Ω) and displacement amplification factor (Cd). This thesis aims to quantify these parameters and evaluate their accuracy based on the method proposed by FEMA-P695. In this method, first, the required initial models are designed by assuming some values for these parameters. Then, the over-strength factor is calculated by performing nonlinear static analysis on nonlinear models. The accuracy of the initial assumptions for the response modification coefficient is investigated using nonlinear incremental dynamic analysis (IDA), obtaining a safety margin for collapse and considering the uncertainties of this process such as design, modelling and experimental data of the previous researches uncertainties, and unreliableness in the scattering of earthquake records used in IDA analysis.Studies on the frames with control systems demonstrates that these structures show more suitable performance against the implied loads. Generally, system control strategies could be categorized into three groups: active, passive, and semi-active control.Despite the suitable performance of the active control systems, their high costs and constant need for energy have led to inactive and semi-active control approaches. In the present study, a method for using smart dampers in lateral bearing elements of the eccentric bracing systems is proposed, which not only does not consume energy but also can dissipate some of the energy implied to the structure in different loading conditions and convert some of this energy into usable electrical energy
  9. Keywords:
  10. Energy Dissipation ; Energy Harvesting ; Off-Center Brace ; Concentric Bracing ; Smart Damper ; Incremental Dynamic Analysis

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