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Value-Based Seismic Design of Framed Tube System of Tall Steel Buildings

Moradmand, Mahdi | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47682 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayun
  7. Abstract:
  8. The objective of this research is to evaluate the concept of a new design methodology based on the total value of the structure namely Value Based Design of structures (VBD) by the use of potential benefits of the ET method. While prescriptive and also performance based approaches of seismic design commonly try to find a structure with lower initial cost satisfying a number of requirements under seismic actions, a new design approach to incorporate directly the concept of value in design procedure have been formulated here to achieve an economical design with lower total cost in its life time. In this method the design sections of structural elements are considered as optimization parameters and the optimization goal is to minimize the total cost of the structure during its life span resulting in maximized value of the structure in its life time. Reduced computational demand in ET analysis method provides the prerequisites to practical use of optimization algorithms in seismic design. The optimization has been conducted through genetic algorithm. For each possible candidate design the damages due to probable earthquakes in its life time is estimated by the ET method and the expected cost of earthquake consequences is calculated using Life Cycle Cost Analysis (LCCA). Three framed tube tall steel buildings with same plans and different heights have been optimally designed according to a prescriptive design code and the proposed value based design method and then seismic performance and cost components of these structures are investigated and compared. The results provide a pathway towards practical value based seismic design and show that conformance to design code requirements do not assure achieving the best design regarding the overall design values
  9. Keywords:
  10. Value Based Seismic Design ; Structural Optimization ; Endurance Time Method ; Nonlinear Dynamic Analysis ; Life Cycle Cost (LCC) ; Framed Tube Tall Buildings

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