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Introduction of Concentric Braced Frame Equipped with BRB & YE (yielding element) and Quantification of Seismic Perfomance Factors
Based on FEMA-P695

Souri, Omid | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55234 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Massoud
  7. Abstract:
  8. This investigation is intended to assess the behavior of SCBFs in the presence of typical brace members, which buckles in compression, and BRBs joining by yielding elements. While braces play a role in providing stiffness for structure, central yielding elements will act as energy-absorbing fuses. In this frame type, energy dissipation will mainly be undertaken by BRBs and yielding elements. The mentioned yielding elements do this by initiating plastic hinges in each corner of the central frame. As it is clear, designing a structure that includes the stated lateral-load-resisting system necessitates seismic performance parameters to be evaluated. Hence, by pursuing the FEMA P695 methodology, seismic parameters including response modification factor, over-strength factor, and deflection amplification factor (R-, Ω-, and Cd-factor) are specified. Several archetypes with various properties were considered to reflect the possible application of this bracing system. Based on FEMA P695, static pushover analyses are implemented to establish over strength factors for archetypes. Subsequently, incremental dynamic analyses (IDA) are implemented to specify adjusted collapse margin ratios (ACMRs). Finally, the acceptance of the assumed abovementioned factors for the system is scrutinized by comparing ACMRs values with the values which are acceptable in FEMA P695.

  9. Keywords:
  10. Response Modification Factor (R) ; Structure Behavior Coefficient ; Yielding Damper ; Federal Emergency Management Agency (FEMA)P695 Code ; Buckling Restrained Braces Frame (BRBF)System ; Seismic Performance

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