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Stability Analysis of High Rise Structures Using the IDA Method

Aghili, Amir | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50894 (53)
  4. University: Sharif University of Technology
  5. Department: Science and Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. The increased height of high-rise structures has made the effects of reduced stability a crucial factor in structural analysis and design. There are a variety of methods for analyzing the stability of high-rise structures. This thesis discusses nonlinear finite element method for analyzing the stability of a three-dimensional 50-storey concrete structure with a height of 150 meter using increment dynamic analysis (IDA). The IDA was first proposed by Bertero.v and it has been adopted in a variety of manners by researchers. In recent years, this method has been confirmed by EEMA. Moreover, FEMA350, FEMA351 and FEMA P695 guidelines have paid special attention to this method for determining overall collapse capacity of the structure. The results of analysis with regard to non-linear finite elements were highly sensitive to meshing. Therefore, the sections of the above structure were optimized so that the results of collapse modes of the structure became more consistent with the reality, and therefore the reliability of results was reinforced. As such, SeiSmoStruct 2016 and MATLAB software were used. Further, since the results of IDA analysis are heavily dependent on selected IM, the scale of near fault records in FEMA P695 based on PGA using SeiSmoSignal 2016 was investigated and two-dimensional and three-dimensional IDA curves including stability analysis for all 28 records of earthquake were plotted. Also, the fragility curve of the collapse was drawn. Following the IDA analysis, the study of above results in the realms of statistics and probability proved promising. Accordingly, FEM P695 provides new insights in this field. Therefore, the results of IDA analysis in statistics and probability areas were considered using Easy Fit Professional based on FEM P695 for the above high-rise structure. These results are especially useful for performance-based design to increase the precision of structure measurement and analysis and offer deeper insights about the behavior and capacity of high-rise structures in the field of nonlinear analysis of probable earthquakes in the future
  9. Keywords:
  10. Incremental Dynamic Analysis ; Probability ; Statistics ; Nonlinear Finite Element Method ; Stability Analysis ; High-Rise Structure

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