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An Investigation on Concrete Frames Reinforced with Shape Memory Alloys in Plastic Hinge Zones

Mobini, Mohammad Hossein | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41039 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khalu, Alireza
  7. Abstract:
  8. In this paper, the response of a concrete one-story frame with smart rebars under static lateral loading has been numerically studied, using Finite Element Method. The material used in this study is Shape Memory Alloy (SMA) which contains nickel and titanium elements. During lateral loading, rebars yield or concrete crushes in compression zone in some parts of the RC frames and also residual deflections are created in the structure. The SMA exhibits little residual strains under cycles of loading and unloading even after passing the yielding zone. In addition, SMAs have a good energy dissipation capacity that helps reduce damage while increasing structural capacity. In this study, SMA rebars were providedin plastic hinge zones. The amounts of steel ratio have been reduced in order to replace SMAs. Since Young’s Modulus of this material is much lower than that of conventional steel reinforcement, it is not feasible and economical (due to relatively high price of shape memory alloys) to replace the total steel with SMA bars. The behavior of this frame has been compared with that of ordinary RC frame designed according to ACI318 code. It was also observed that using smart rebars led to decrease the amount of residual displacement and decrease in the energy dissipation capacity of the frame. Moreover in each model the amount of stiffness reduction and its effects have been studied
  9. Keywords:
  10. Concrete Frame ; Smart Rebar ; Permanent Displacement ; Shape Memory Alloy

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