Abstract
ABSTRACT In the present research, the performance of steel special moment frames having one damaged column designed based on seismic provisions has been evaluated during the progressive collapse under the ground motions. For this purpose, five- and ten-story two-dimensional steel frames with four bays have been modelled by utilising OpenSees software with and without considering a weak column. Moreover, nonlinear incremental dynamic analyses (IDA) have been carried out on the structures under far and near-field ground motions. In the case of the model with a weak column, the potential of progressive collapse has been assessed using the Alternative Load Path Method recommended in the General Service Administration (GSA) guideline. In this state, due to the defect in the implementation of column splice, the damaged column represents a situation in which it is weak in terms of bending performance and collapsed by the earthquake. Furthermore, the effect of floor number, weakness of column, and the type of applied earthquake have been discussed. According to the obtained results, a structure including one damaged column has a weaker performance in the near-field compared with in the far-field ground motions before a progressive collapse.
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