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Seismic Risk Assessment of Transmission Towers under Mainshock-Aftershock sequence Pardis-Vardavard 400 KV transmission line Case Study

Paktinat, Mohaddeseh | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56425 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Bakhshi, Ali
  7. Abstract:
  8. The main purpose of this research is to evaluate the impact of mainshock and aftershocks on the response and fragility of power transmission towers and to provide an approach to assess the risk of transmission lines under mainshock-aftershock sequence. The transmission line studied in this research has 27 self-supported 400 kV transmission towers. The reason for choosing this line is the proximity of the line to the active faults of Tehran like Mosha and North-Tehran, as well as the service of the line to a large residential and industrial area, which, in case of damage by an earthquake, will cause considerable direct and indirect loss to the society. In the three-dimensional models simulated in this research, all nonlinear effects, including buckling in angle sections, which is the most important failure mode in this type of structure, have been taken into account, and an attempt has been made to simulate the line and faults as well as damage estimation to be close to reality. For this purpose, an incremental dynamic analysis has been performed on the finite element model of the transmission tower, and taking into account the uncertainty in the intensity and frequency content of earthquakes, the fragility curve and finally the probability of exceedance of structural cost -or the seismic risk, in short- has been calculated. The results observed in this research can be used for the seismic retrofit of the studied transmission line so that in the occurrence of an earthquake, the society will suffer the least possible damage. Also, the investigation of life cycle costs by potential investors in transmission lines can lead to a more informed decision in the construction of these types of lines, especially in Tehran metropolis
  9. Keywords:
  10. Fragility Curve ; Life Cycle Cost (LCC) ; Risk Assessment ; Seismic Assessment ; Seismic Risk Index ; Earthquake Effect Modeling in Transmission Lines ; Risk Analysis Under Mainshock-Aftershock Sequence

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