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Life-Cycle Cost-Based Seismic Retrofit of Steel Frame with Dual Pipe Damper

Ghaderi Garakani, Majid | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49072 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. Nowadays seismic designs of building structures are based on a life-safety criterion that made the structures do not collapse to compromise safety of human life in the structure, but they can be designed to experience some damage. However, this design method has permitted large economic losses due to the damage to the structural and non-structural components at rather moderate levels of seismic intensities. This led to a new concept about design approach called performance-based design that satisfies the life-safety objective at the same time, reduces the economic loss to an acceptable level. In this study, the use of energy dissipating damping devices to improve the performance of a building structure in a favorable manner over all levels of seismic intensities has been investigated. Since the initial motivation of performance-based design was the reduction of economic loss, the life-cycle cost-based optimization is considered in this study to obtain the optimal designs with a damping device called Dual Pipe Damper (DPD). DPD is a yielding metallic device for passive control of structures, introduced recently [1]. The genetic algorithm (GA) method is adopted as an optimizer that searches for the optimal solution in an iterative way. Numerical results from the application of the optimal design to the benchmark building model are presented to demonstrate the applicability of the life-cycle cost-based optimization. It is shown in the results that the optimal distribution of DPD is very impressive in reducing the expected failure cost as well as the displacement response quantities and seismic fragilities. The results also show that the optimal designs focus relatively more on reducing economic losses for the lower but more frequent seismic intensities as these intensities contribute most to the failure costs
  9. Keywords:
  10. Performance Based Design ; Genetic Algorithm ; Optimization ; Life Cycle Cost (LCC) ; Seismic Rehabilitation ; Metallic Yield Damper ; Educational Attainment ; Family Size ; Birth Order

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