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<p>Eccentrically braced frames are type of structural system which combines both braced frames and moment frames. The diagonal braces connected to beams or columns with intentional offsets are used to resist lateral forces from earthquake or wind. Structures are currently designed using codal methods which includes Strength Based Design (SBD), where the Response reduction factor inadequately accounts for the inelasticity. Performance Based Plastic Design (PBPD) approach overcomes the drawbacks of the codal method, or SBD method. This study emphasizes designing a 12-story building with Eccentrically Braced Frames (EBFs) using two methods and comparing their performance. The methods to be compared are the SBD method, which adheres to the standards of ASCE and AISC, and the PBPD method developed by Lee and Goel. The performance is evaluated by using nonlinear analysis namely, Nonlinear Static Pushover Analysis, Nonlinear Time History Analysis, and Incremental Dynamic Analysis. The results show that the PBPD method has better performance than the SBD method in terms of yield drift, ductility ratio, and inter-story drift. The SBD method exceeds the expected yield drift of 0.5%, while the PBPD method does not (i.e., AISC yield drift is 0.65% and PBPD yield drift is 0.45%). The SBD method has a larger difference in ductility ratio than the PBPD method. The SBD method also has a higher inter-story drift than the PBPD method.</p>

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Performance Evaluation of Eccentrically Braced Frames by Strength Based and Performance Based Plastic Design Methods Considering Turkey’s Ground Motions

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Bapugouda B. Biradar,
  • Mohammedakeel Hakeem,
  • Bush RC,
  • Anoop I. Shirkol

摘要

Eccentrically braced frames are type of structural system which combines both braced frames and moment frames. The diagonal braces connected to beams or columns with intentional offsets are used to resist lateral forces from earthquake or wind. Structures are currently designed using codal methods which includes Strength Based Design (SBD), where the Response reduction factor inadequately accounts for the inelasticity. Performance Based Plastic Design (PBPD) approach overcomes the drawbacks of the codal method, or SBD method. This study emphasizes designing a 12-story building with Eccentrically Braced Frames (EBFs) using two methods and comparing their performance. The methods to be compared are the SBD method, which adheres to the standards of ASCE and AISC, and the PBPD method developed by Lee and Goel. The performance is evaluated by using nonlinear analysis namely, Nonlinear Static Pushover Analysis, Nonlinear Time History Analysis, and Incremental Dynamic Analysis. The results show that the PBPD method has better performance than the SBD method in terms of yield drift, ductility ratio, and inter-story drift. The SBD method exceeds the expected yield drift of 0.5%, while the PBPD method does not (i.e., AISC yield drift is 0.65% and PBPD yield drift is 0.45%). The SBD method has a larger difference in ductility ratio than the PBPD method. The SBD method also has a higher inter-story drift than the PBPD method.