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Retrofitting of Existing Steel Frames using Ductile Bracing Systems

Seyyed Farizani, Sarah | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47111 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. Recent earthquakes indicate the importance of retrofitting existing structures to achieve an acceptable level of performance. Use of bracing systems is a cost-effective method for seismic retrofitting of existing steel frames. In particular, Buckling Restrained Braces (BRBs) and Special Concentrically Bracing systems (SCB) are practical choices to be used because of their large energy dissipation capacity especially under moderate to severe earthquakes. Buckling restrained braces which yield in both tension and compression, exhibits stable and predictable hysteretic behavior. In this study several existing steel frames, which are designed based on older versions of the building codes, have been evaluated. In the next stage BRBF systems as well as SCBF systems were used to rehabilitate those frames. By having focus on results for the both ductile brace systems, it is observed that earthquake energy dissipates by brace systems and all of plastic hinges are formed in bracing elements. No hinge forms in columns after proper retrofitting. Also it is seen that for same column sections, design stress ratio in BRBFs is less than SCBFs. It is observed that the stiffness of SCBFs is more than BRBFs while energy absorption by BRBFs is larger
  9. Keywords:
  10. Ductility ; Earthquake Resistance ; Buckling Restrained Braces Frame (BRBF)System ; Special Concentrically Braced Fram System (SCBFS)System ; Pushover Analysis ; Seismic Retrofit

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