The fundamental period of a group of reinforced concrete (RC) buildings located in the cities of Victoria and Vancouver (British Columbia, Canada) has been estimated using ambient vibration data. As result a preliminary height- dependent relationship has been derived for a fully elastic condition. The regression returns very similar values respect to those obtained in other countries using the system identification technique based on ambient vibrations. As expected, the results show that building periods estimated based on simple equations provided by earthquake design codes in Europe (EC8) and North America (UBC97 and NBCC-2005) are significantly greater than the periods computed using ambient vibration records on the monitored buildings.
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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