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Quantification of Seismic Performance Factors in Off-Center Bracing System(OBS) Equipped with Knee Element

Asefi, Hamed | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52250 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. OBS Bracing System is a kind of concentric bracing frame that consists of three members and with y-shape layout can provide a necessary opening in the building. In this investigation will evalouate OBS Bracing System with Knee element. Buildings equipped with OBS-Knee bracing system considered SCBF. To design these buildings according to regulations, it is needed to have Seismic performance coefficients such as response modification factor (R), over strength factor (Ω0) and deflection amplification factor (Cd). The purpose of the present investigation is quantifying these parameters and evaluation of accuracy based on the proposed method in FEMA P695. In the mentioned method, at first by assuming values for these parameters, required initial models have designed. Then by doing nonlinear static analysis on the designed nonlinear models, over strength factor (Ω0) will be obtained. By doing incremental dynamic Analysis (IDA) and obtaining collapse margin ratio (CMR) by considering existing uncertainties in this process like existing uncertainties in design, modeling, lab results and distribution of earthquake records used for IDA,The validity of the initial assumptions for the coefficient of system behavior have investigated
  9. Keywords:
  10. Off-Center Brace ; Knee Brace ; Structure Behavior Coefficient ; Overstrength Column Factor ; Collapse Margin Ratio ; Nonlinear Incremental Dynamical Analysis ; Response Factors

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