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Investigating the Seismic Behavior of Steel Moment Resisting Structures using SMA Equipped Connections

Atrchin, Nader | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49058 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahim Zadeh Rofooei, Fayyaz
  7. Abstract:
  8. Shape memory alloys (SMAs) are nowadays promising candidates for seismic engineering appli-cations due to their ability to undergo reversible deformations and to dissipate energy when subjected to cyclic loading. This thesis presents a numerical study of the torsional performance of structures equipped with end-plates connections using SMA as well as high strength steel bolts and identifies the required locations of SMA connections in a number of typical steel mo-ment resisting frames to improve their seismic torsional performance in terms of maximum inter-story drift and residual deformations. In this regard, 6 and 9-story steel structures were considered with eccentricity ratios of 0%, 10%, and 20%. These structures were then equipped with three types of connections: all rigid, all SMA, and 50% SMA (outer core) and 50% rigid (in-ner core). All aforementioned structural models are designed using ETABS program and imported to the OpenSees program for nonlinear time history analyses subjected to 7 pairs of earthquake records, and the results are presented as mean averages of various response parameters (inter-story drifts, residual drifts, etc.). It was shown that the SMA equipped connections were able to modify the torsional response of the considered structural models in terms of residual deformations. Also, the joint application of two types of connections, the maximum inter-story drifts in the considered models could adequately be reduced
  9. Keywords:
  10. Shape Memory Alloy ; Steel Structures ; Torsional Behavior ; Nonlinear Dynamic Analysis ; Permanent Displacement ; Moment Steel Frames

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