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Steel and Composite Structures
  Volume 12, Number 3, March 2012 , pages 231-248

Element loss analysis of concentrically braced frames considering structural performance criteria
Farshad Hashemi Rezvani and Behrouz Asgarian

    This research aims to investigate the structural behavior of concentrically braced frames after element loss by performing nonlinear static and dynamic analyses such as Time History Analysis (THA), Pushdown Analysis (PDA), Vertical Incremental Dynamic Analyses (VIDA) and Performance-Based Analysis (PBA). Such analyses are to assess the potential and capacity of this structural system for occurrence of progressive collapse. Besides, by determining the Failure Overload Factors (FOFs) and associated failure modes, it is possible to relate the results of various types of analysis in order to save the analysis time and effort. Analysis results showed that while VIDA and PBA according to FEMA 356 are mostly similar in detecting failure mode and FOFs, the Pushdown Overload Factors (PDOFs) differ from others at most to the rate of 23%. Furthermore, by sensitivity analysis it was observed that among the investigated structures, the eight-story frame had the most FOF. Finally, in this research the trend of FOF and the FOF to critical member capacity ratio for the plane split-X braced frames were introduced as a function of the number of frame stories.
Key Words
    element loss, progressive collapse, concentrically braced frame, pushdown, vertical incremental dynamic analysis, failure mode, performance-based analysis, overload factor.
Faculty of Civil Engineering, K.N.Toosi University of Technology, Tehran, Iran

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