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Application of Damage Indices In Seismic Analysis of Concrete Frames Using Endurance Time Method

Baniassadi, Arash | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43269 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoun
  7. Abstract:
  8. In most places in the world as it is in our country, structural vibration caused by earthquakes are among the most destructive menaces for the building. For this reason one of the main goals for civil engineers is constructing structures that can perform properly in an earthquake-exposed situation. For moving toward this goal it is necessary to estimate structural responses considering probable earthquake excitation and use these data for design of new structures or retrofitting of existing ones. In this research, the capability of a new method named Endurance Time analysis in seismic assessment of concrete moment frame is investigated in nonlinear range. ET is a new dynamic time history analysis, which uses artificial intensifying acceleration functions consist of wide range of earthquake records for estimating response and Engineering Demand Parameters in the entire range of elastic, yield and collapse behavior. Because of high computational speed and dynamic based definition of this method, it can be useful for performance base design. Two to fifteen stories concrete moment frames with period ranges from 0.2 to 1.8 second are considered and designed regard to standard regulation as representative models. Some engineering demand parameters are considered and the results of ET method are compared with those acquired from Nonlinear Time History method for different levels of performance. Effects of large nonlinear deformations such as P-Δ on the models are also studied. According to the results a comprehensive statistical study on the accuracy of ET results for different seismic intensities is also done. Application of endurance time method for evaluating Damage Indices for concrete moment frame is also investigated. Some DIs are defined and quantity and location of local and global damages in models are computed based on NTH and ET methods. At last some equations between different damage indices are presented

  9. Keywords:
  10. Damage Index ; Endurance Time Method ; Moment Resisting Rainforced Concrete Frame ; Seismic Analysis ; Performance Based Design ; Seismic Assessment

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