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Seismic Hazard Assessment in the Lifetime Duration of Steel MRF Structures Considering Aftershocks

Farivarrad, Amir Hooshang | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48999 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourstekanchi, Homayoon
  7. Abstract:
  8. Following a large earthquake, numerous aftershocks can be triggered due to the complex stress interaction between and within tectonic plates. The aftershocks have the potential to cause severe weakening of mainshock-damaged buildings, threaten life safety, hamper reoccupation and restoration of buildings, and increase financial loss. The probability of aftershocks has not been included in the description of seismic hazard in performance-based earthquake engineering. This study proposes methodologies and a framework to investigate the seismic performance in the lifetime of steel MRF structures subjected to mainshock-aftershock sequences. The case studies correspond to three SAC 2D steel MRF buildings of three, nine and twenty stories. The models are able to capture important properties of deterioration of strength and stiffness. Endurance time method cans predict the response of structures in different hazard levels with low computational cost and acceptable accuracy used here and the results were compared with results of nonlinear incremental dynamic analysis. The seismic performance of structures in a wide range of excitation levels of mainshocks and aftershocks have been examined by using synthetic mainshock-aftershock seismic sequences produced by combining the accelerograms of endurance time method. Seismic losses are determined based on the maximum dynamic response of structure in different seismic levels. New conceptual curves for different seismic performance levels and residual collapse strength of damaged post-mainshock buildings are presented. This research properly shows the requirement of including probability of aftershocks into the definition of seismic hazard in performance-based earthquake engineering, and the framework used here cans be the initial point to achieve this goal
  9. Keywords:
  10. Endurance Time Method ; Nonlinear Dynamic Analysis ; Performance Levels ; Performance-Based Earthquake Engineering ; Residual Strength ; Collapse Analysis ; Moment Steel Frames ; Seismic Hazard Analysis ; Seismic Sequences ; Aftershocks

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