Investigation onthe Seismic Behavior of Steel MRF with Shape Memory Alloy Equipped Connections

Farhidzadeh, Ali Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40670 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. Various types of passive energy dissipating systems have been introduced for controlling the seismic response of structures during the last few decades. A number of these control devices have been practically implemented in different structures all over the world. Shape Memory Alloy (SMA) is among those passive control systems that have attracted a large attention due to its innate features, i.e., recovering the induced residual strains upon unloading (superelastic effect) or by heating (shape memory effect).This study investigates the seismic behavior of a set of steel structural models with different number of stories and eccentricities equipped with a type of fixed SMA connections. In the beginning, the SMA connection model in austenite phase, proposed by Hongwei Ma., is considered and the related moment-rotation behavior is verified through numerical simulation. Then, extensive nonlinear dynamic analyses are performed using 3, 6, 9, and 12 story structural models with 0, 5, 10, and 15 percent of eccentricities subjected to different bi-directional earthquake components scaled to 0.4g and 0.6g.The preliminary results show that using the aforementioned model for fixed SMA connection; the drifts are considerably reduced and became more uniformed along the height when compared to the regular structures. However, SMA connections become less effective for the eccentric structural models. The OpenSees program is used for modeling of the connections with SMA materials and the numerical analyses.

  9. Keywords:
  10. Superelasticity ; Steel Moment Resistant Frame ; Dynamic Response ; Passive Control ; Shape Memory Alloy

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