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Vertical Addition Effect of Existing Concrete Moment Frames in Increasing Life Cycle Cost

Aliaghdam, Morteza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55184 (09)
  4. University: Sharif University of Technolog
  5. Department: Civil Engineering
  6. Advisor(s): Esmail Pourestekanchi, Homayoon
  7. Abstract:
  8. Vertical addition of existing buildings provides more living space without the need for more land use. Also adding a story on an existing building is one of the common needs in metropolitans. However, the structure may bear high risk due to vertical addition. This study aims to model conventional concrete structures built in Tehran and then assess and compare the seismic performance of base structure and extended structure. Seismic performance of a system is defined as their efficiency in providing enough safety and reducing the Life-Cycle Cost. For this purpose, seven archetypes as base structures and eight extended structures corresponding to base structures, that had residential occupancy, were designed in accordance with common Iranian codes, and their responses at different intensities were obtained by a nonlinear time history analysis by the means of Endurance Time Method. Afterward the seismic consequences were evaluated according to FEMA-P58 guidelines, and the total cost of the buildings was determined. These archetypes were different in the level of ductility and the number of stories. Finally, it was observed that after vertical extension, in general the amount of seismic risk and total cost of the building increases more than expected in comparison with the general trend of increasing risk in structures with different number of floors. Low-rise intermediate moment frames and all special moment frames are affected by the increase in the share of collapse in repair cost. On the other hand, mid-rise and high-rise intermediate moment frames are affected by the increase in the share of structural damages and residual drift.
  9. Keywords:
  10. Life Cycle Cost (LCC) ; Endurance Time Method ; Seismic Risk Cost ; Seismic Risk Index ; Federal Emergency Management Agency (FEMA)P58 Code ; Federal Emergency Management Agency (FEMA)P695 Code ; Vertical Addition ; Reinforced Concrete Moment Frames

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