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بهبود رفتار لرزه ای سازه های نامتقارن قاب خمشی فولادی با استفاده از اتصالات مجهز به آلیاژ حافظه دار شکلی و با درنظرگرفتن اندرکنش خاک و سازه
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بهبود رفتار لرزه ای سازه های نامتقارن قاب خمشی فولادی با استفاده از اتصالات مجهز به آلیاژ حافظه دار شکلی و با درنظرگرفتن اندرکنش خاک و سازه

سفیدی جیرنده، کوثر Sefidi Jirandeh, Kosar

Improving the Seismic Behavior of Asymmetric SMRFs Using Shape Memory Alloy Connections Considering Soil-Structure Interaction

Sefidi Jirandeh, Kosar | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53842 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayaz
  7. Abstract:
  8. The use of shape memory alloys (SMAs) has been seriously considered in earthquake engineering due to their unique capabilities, such as the ability to tolerate cyclic deformations, recentering, and dissipating energy. Consequently, the effect of hybrid connections (SMA and steel based beam-column connection) in asymmetric structures is investigated in this research.A 4 story steel special moment resisting frame with 0%, 10%, and 20% eccentricities have been considered to find out the performance of a novel beam-column connection in reducing the seismic response of structures such as maximum drift ratio and residual displacement. In order to find out this issue first, the symmetric model has been designed by ETABS program then the behavior of hybrid connection under cyclic load was verified by using ABAQUS. Finally, the different models with various distributions of the proposed connection both in plan and along the height were prepared in OpenSees program, assuming a rigid base. Afterwards, the effect of soil-structure interaction was added to those models using the monkey tail approach. Nonlinear dynamics analyses were carried out for all models using 7 pairs of earthquake records, and the average of the maximum results are presented. The prescribed distributions of connections in plan and along the height are named as, All Rigid, All SMA, Inner SMA, Outer SMA, Flexible Edge SMA, Stiff Edge SMA, and SMA 1234, SMA 24, SMA 13, Rigid 1234, respectively. The obtained results indicate that mixed application of the proposed and rigid connections not only reduces the maximum drift ratios and the maximum residual displacement but also in a way it reduces the construction cost as the proposed connection is used in less than 37% of all connections on average. In plan distributions, the Inner SMA has the best performance for symmetric structure and Flexible Edge SMA works better for asymmetric ones. Among the distributions along the height, the SMA 24 was more efficient in reducing the residual displacements. The soil-structure interaction increases the drift ratio of the first floor and residual displacement for most of the distributions
  9. Keywords:
  10. Shape Memory Alloy ; Soil-Structure Interaction ; Nonlinear Dynamic Analysis ; Residual Displacement ; Drift Ratio ; Connections Distribution ; Seismic Behavior ; Steel Moment Resistant Frame

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