arma modelling of artificial accelerograms for western iran

the artificial accelerograms have been developed for assessing the dynamic response ofstructures. considering seismological properties of the site are necessary for the best simulation ofaccelerograms. the real recorded accelergrams for simulating earthquake phenomenon are used in thearma model. this is due to the fact that the arma model can be considered more advantageous than theothers.in this paper, 25 recorded accelerograms are used for simulating accelerograms of a dam site inhamedan province in western iran. the parameters which are used in the stationary transformation arerelated to the physical parameters (eg. magnitude, epicentral distance and duration) via a regressionanalysis. to generate artificial accelerogram, the physical parameters enter the arma model, thereforethe output would be a stationary time history adjusted with recorded accelerograms. the generatedstationary time history is changed into a non-stationary time history from the amplitude and frequencypoint of view.