In this paper, the seismic vulnerability of Mashhad city, as the second largest city in Iran, has been investigated\r\nusing analytical fragility curves. Disaggregation analysis is first performed in order to identify the target epsilon at\r\ndifferent hazard levels. The disaggregation results revealed different epsilon values at the first mode period of two\r\nrepresentative structures, in the case of 72-, 475-, and 2,475-year return periods. Nonlinear incremental dynamic\r\nanalyses are then performed for two representative models of a typical steel frame with a concrete shear wall,\r\nusing independent suites of acceleration time histories that are selected based on the target epsilons. Structural\r\nlimit states are defined on each incremental dynamic analysis curve, and the corresponding damage measures are\r\nestimated. The results show that if e is neglected in the considered simulations, then the predicted median structural\r\ncapacities is decreased by around 10%, 15%, and 18%, respectively, for the three abovementioned hazard levels.
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