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Evaluating the Effects of Aftershocks on Increasing the Structural Damages in Special Steel Moment Frame Building

Hajili, Ronak | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56883 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz; Ghods, Babak
  7. Abstract:
  8. The purpose of this study is to investigate the effect of consecutive earthquakes by considering different levels of structural damage intensity index. The cumulative damage of structures caused by the sequence of main earthquake and aftershock is a combination of the initial damage caused by the main earthquake and the increased damage caused by the aftershock. The evaluation process of the main earthquake and aftershock is divided into two parts: evaluation of the fragility of the main earthquake and evaluation of the fragility due to the aftershock. This investigation was carried out using a 4-story steel building with special moment resisting frame. The results for the case of only the main earthquake and the sequence of the main earthquake and the aftershock are presented in three forms of situation depended fragility curves, the three-dimensional presentation of the results, and the fragility surfaces are presented. Also, the effects of the aftershock on structural damage was compared to the case where there is only the main earthquake is discussed. It was found that the sequence of the main earthquake and the aftershock can cause a higher probability of exceedance for the limit states compared to only the main earthquake. Furthermore, successive earthquakes can lead to a decrease in the average fragility of the sequence of the main earthquake and the aftershock in a specific intensity index of the aftershock. Such a reduction increases with the increase in aftershock intensity. Also, for larger level of damage caused by the main earthquake on the structure, bigger changes in fragility curves could be expected by the aftershocks
  9. Keywords:
  10. Structural Damage Detection (SDD) ; Fragility Curve ; Nonlinear Time History Analysis ; Damage State Prediction ; Steel Moment Frame Buildings ; Aftershocks

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