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Seismic Performance of Self-centering Concentrically Steel Braced Structures

Haghighat, Ali | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49159 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. The purpose of this thesis is assessment of seismic performance of self-centering concentric braced frames (SC-CBF). In this structures, the column under tension can uplift from the foundation at a specified level of lateral loading and by using some methods such as post-tensioning (PT) bars or tendons, the structure is able to self-center after severe Earthquakes. In this systems, PT bars and energy dissipation elements resist column uplift. The effect of energy dissipation ratio and initial stress in PT bars was investigated in design and performance of four four-story analytical models. Nonlinear static and dynamic analyses were conducted to compare some parameters in these four models such as: maximum roof drift, overturning moment, hysteresis loops, PT bar forces, force demand in energy dissipation elements and column gap opening. Increasing energy dissipation ratio, reduced overall member sizes, PT bar area, maximum roof drift and base shear. On the other hand, although increasing initial stress in PT bars, increased the overturning moment at column decompression, but inadequate capacity of energy dissipation elements, increased the probability of PT bar yielding under DBE-level ground motions. Nonlinear Dynamic analysis showed that when the PT bar was at it’s maximum force, one of the column base was at it’s maximum gap opening as well. The results of nonlinear static and dynamic analyses proved that the system can self-center and eliminate residual drifts after earthquake
  9. Keywords:
  10. Self-Centering System ; Post Tensioning ; Energy Dissipation ; Seismic Performance ; Steel Structures ; Column Uplift

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