Successive collapse potential of eccentric braced frames in comparison with buckling-restrained braces in eccentric configurations

Abstract

In the present research, the successive collapse potential of eccentric braced frames (EBF) in comparison with bucklingrestrained braces in eccentric configurations (BRBF-E) has been studied. Initially, five-story EBF and BRBF-E were analyzed and designed according to the guidelines of the American Institute of Steel Construction (AISC). Subsequently, the nonlinear dynamic analysis based on Unified Facilities Criteria (UFC) guidelines was used. The Alternate Path Method was used in the mentioned structures with various cases for removed columns. Both critical cases and successive collapse potential through values such as Impact Factor for columns, the end point vertical displacement of removed column and Demand-Capacity Ratio for link beams have been specified. The results indicate that removing edge columns caused further critical situation in EBF and BRBF-E compared to the other cases. The results elaborated that the BRBF-E has higher vulnerability than EBF. Furthermore, additional analysis were undertaken to establish the lateral stability of the removed columns. The results of the lateral stability analysis in one of the cases confirmed that the analyzed parameters were increased.