Measuring structural damage during earthquakes has always been a challenging problem for earthquake engineers.\r\nVarious damage indices are proposed with the objective of quantifying the structural damage in prototype and\r\nmodel structures subjected to seismic excitation. In this study, seismic vulnerability of irregular steel buildings is\r\nassessed in three dimensions considering effects of the panel zone, which has not been considered in recent\r\nstudies of the field of seismic vulnerability. The buildings are modeled with different storeys and irregular plans.\r\nSeismic performance of buildings was assessed in life-safety and collapse-prevention levels. Cumulative functions of\r\ndamage indices are applied in the nonlinear dynamic analysis of buildings in the near-field ground motions. It is\r\nconcluded that participation rates of deformation and energy in the damage of irregular buildings are 74.5% and\r\n25.5%, respectively. Severe damage and collapse due to seismic dissipated energy occurred in the initial storeys of\r\nlow-rise buildings and in the middle storeys of high-rise buildings.
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