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Effect of Asymmetry on Seismic Behavior of Concrete Structures Using Non-Linear Analysis

Nozhati, Saeed | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44986 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. The experience from the performance of buildings during past earthquakes has shown that asymmetric buildings often sustain more extensive damages as compared to the symmetric buildings. The rules of seismic design codes about these buildings are based on investigation of single story buildings in the elastic range and they use rigidity eccentricity as main irregularity criterion. Inasmuch as during damaging earthquakes some lateral force resisting elements will not remain elastic and they reach yield, rigidity eccentricity will no longer be an appropriate parameter to represent the asymmetry of structure; thereby, in these building all centers of mass, rigidity, and strength should be paid attention. Therefore, in this thesis six inelastic four story 3-D reinforced concrete structures with different eccentricities are modeled and they are investigated by comparing their fragility curves in each seismic performance criterion and using Incremental Dynamic Analysis. The results show that models with a smaller strength eccentricity perform better in collapse prevention criterion; additionally, mean annual frequency certify this assertion. Uniform strength distribution can reduce damage during damaging earthquakes. In particular, results indicate that strength distribution that results in the location of the center of strength CV and the center of rigidity CR on the opposite sides of the center of mass CM is one of the best models for designing. Furthermore, in this study by using Akaiek Information Criterion, the best cumulative distribution functions for fragility curves are found
  9. Keywords:
  10. Fragility Curve ; Asymmetric Concrete Buildings ; Strength Center ; Rigidity Center ; Akaieke Information Criterion ; Incremental Dynamic Analysis

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