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Seismic Enhancement of Existing Steel Frames by Employing Viscous Dampers through Value-based Optimization

Karami, Mostafa | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54412 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmail Pourestekanchi, Homayoon; Hajirasooliha, Iman
  7. Abstract:
  8. Recent studies show that the code-compliant structures have faced a lot of damages in earthquakes, and their performance could improve. The structure should have the least initial cost in this approach, which observes all of the code's limits regardless of the structure's life cycle cost. In recent years, value-based design has been considered as an alternative for code-based design procedures. In this method, some other parameters are considered as well as the initial cost of the structure, including risk, resiliency, reliability, and sustainability. In this paper, the structures' total cost is studied by Fema P-58, while it is equipped with viscous dampers. The structures are 4, 8, and 12 stories which are designed in high, medium, and low seismic intensities. For dynamic analysis of the structures, the ET method has been applied, which is cost-effective, and its accuracy is acceptable. The Genetic algorithm has optimized the damping coefficient of the viscous dampers. The results show that short structures have more room to be improved; on the other hand, structures designed in high-risk regions could improve more than in other regions. Also, the effects of changing the initial cost of the dampers and comparing the seismic behavior of the structures with linear and nonlinear viscous dampers have been observed
  9. Keywords:
  10. Life Cycle Cost (LCC) ; Viscous Damper ; Optimization ; Endurance Time Method ; Federal Emergency Management Agency (FEMA)P58 Code ; Value Based Seismic Design

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