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Selection of Suitable Arrangements of Buckling-Restrained Braces for Reducing Residual and Maximum Drift of Structures

Vaezzadeh, Amin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44976 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadizadeh, Mehdi
  7. Abstract:
  8. By constraining the steel members against lateral buckling, buckling-restrained braces (BRB’s) show similar load-deformation behaviors and energy absorption capacities in both tension and compression. As a result, BRB’s demonstrate significant energy dissipation capacity compared to ordinary braces. On the other hand, the relatively small post-yield stiffness of BRB’s usually leads to significant residual drifts, which may render the structure unusable. In recent decades, significant research has been put into improving the performance of structures equipped with BRB’s. In this project, the current methods to enhance the performance of the BRB’s are explored, and novel approaches are proposed. These methods include the use of BRB’s with varying properties in each story of buildings, and combined usage of BRB’s with other energy dissipating devices such as viscous dampers. It is demonstrated that not only these methods result in meaningful reduction of residual interstory drifts, they are also able to reduce the peak displacement response, without adversely affecting the structural accelerations. Among these methods, the use of BRB’s with varying properties in plan and in elevation appears to be an economical and effective approach for improving their effectiveness in improving the structural performance
  9. Keywords:
  10. Nonlinear Analysis ; Buckling Restrained Braces Frame (BRBF)System ; Residual Drift ; Maximum Drift ; Buckliny Restrained Braces (BRB)Arrangment

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