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Determining The Response Modification Coefficient for Steel Multi-Tiered Braced Frames

Aghaalikhani, Shaghayegh | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52565 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. In order to design buildings such as industrial structures, which use multi-tiered braced frames as their lateral load resisting system, it is required to know seismic performance factors, including the response modification coefficient (R), the overstrength factor (Ω0), and deflection amplification factor (Cd). The main purpose of this study is to assume initial seismic performance factors and evaluate their accuracy based on Fema-P695 methodology. This methodology provides a reliable basis for determining seismic performance factors of different lateral load resisting systems. In this study 8 archetypes have been chosen and designed with initial factors of 6, 2 and 5 as R, Ω0 and Cd, respectively. Then, the archetype nonlinear models have been developed by using Perform 3D software. Primarily, nonlinear static analysis have been done to validate the nonlinear models and calculate the overstrength factors and finally, incremental dynamic analysis have been performed to find collapse capacities and calculate collapse margin ratios. By comparing the calculated collapse margin ratios and the acceptable ones provided by FEMA-P695, the accuracy of the initial factors have been evaluated. According to the results, the initial response modification factor (R=6) can meet the desirable performance and be used for designing this kind of lateral load resisting system. Other factors including overstrength and deflection amplification factors have been calculated as 3.5 and 6, respectively
  9. Keywords:
  10. Seismic Performance Factors ; Response Modification Factor (R) ; Nonlinear Static Analysis ; Incremental Dynamic Analysis ; Structure Behavior Coefficient ; Overstrength Column Factor ; Deflection Amplification Factor ; Multi-Tiered Braced Frame

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