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Sustainability Assessment of Steel Moment Frame Structures Using Life-Cycle Cost Optimization by Utilizing Endurance Time Method

Yazdi Moghaddam, Mohammad Ali | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56638 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoon
  7. Abstract:
  8. The sustainability of urban infrastructure is assessed in three integral economic, social, and environmental dimensions. This study focuses on advancing a design approach based on value through the optimization of the life-cycle cost of steel moment frames, considering sustainability indicators by utilizing endurance time method analysis.In this path, the dimensional specifications of steel frame sections are selected optimally using an automated process with the objective of minimizing the cost of the structure's life cycle as the objective function and code specifications as optimization constraints. The cost of the life cycle, includes material extraction and production, transportation, construction, operation phase, end-of-life, and recycling in all three dimensions of sustainability. The cost of the operational phase includes seismic risk damages in accordance with the FEMA P-58 approach. For a case study, 4, 8, and 12-story steel buildings with moment-resisting frames for seismic loading in the two main building directions have been selected. To assess the impact of environmental consequences on the frame sections and the life-cycle cost, optimization employs three separate design approaches. The first approach solely minimizes construction costs while adhering to minimum code specifications. The second approach is value-based design, without considering environmental consequences. Finally, the third approach is similar but takes into account environmental costs during the life cycle. Optimization results demonstrate improved structural performance, reduced seismic risk costs, and ultimately a reduced life-cycle cost due to the consideration of environmental consequences in the optimization of the 4-story frame. This effect diminishes as we move towards 8 and 12-story frames. Furthermore, the most significant contribution of environmental consequences is associated with non-structural elements in the non-seismic part, and considering environmental consequences in the optimization results in the greatest reduction in 4-story frame. Therefore, achieving sustainable infrastructure requires the incorporation of environmental consequences in the optimization of low-rise steel moment frame buildings
  9. Keywords:
  10. Value Based Seismic Design ; Life Cycle Cost (LCC) ; Seismic Risk Cost ; Steel Moment Frame Buildings ; Endurance Time Method ; Environmental Impact ; Infrastructure Sustainability

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