In this study the progressive collapse-resisting capacities of steel moment-resisting frame buildings designed according to the Italian Code were evaluated. At first, a stepwise increment of amplified vertical loads (pushdown analysis) for a variety of possible scenarios regarding the location of the missing column was employed. Then, as the nonlinear dynamic analysis for progressive collapse analysis does not require modeling of complicated hysteretic behavior and may be used as a practical tool, it was applied for evaluation of progressive collapse potential with the same first story column suddenly removed. According to the analysis results, the progressive collapse potential varied significantly depending on the location of the removed column. It was also observed that the pushdown analysis may greatly overestimate the inelastic response of the structure.
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