This paper aims at addressing the variation of fundamental period when the ductility and the damageability criteria varies. In order to investigate the influence of drift limitation on the fundamental period of vibration a huge parametric study using modal dynamic analysis, composed of 144 designed cases of steel moment resisting frames has been conducted. These are compared with the code prescribed fundamental period. It is observed that as the drift limitation varies from the more relax to the most stringent the fundamental period decreases and therefore the stiffness of the frame increases. The obtained period from the code are in the same range to the one obtained from the modal analysis when the strict drift limit is employed in the design.
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