ARMA MODELLING OF ARTIFICIAL ACCELEROGRAMS FOR WESTERN IRAN

Document Type: Regular Paper

Authors

1 Department of Geology, Tarbiat Moallem Univ., Tehran, I. R. of Iran

2 Department of Eng. Seismology, BHRC, Tehran, I. R. of Iran

Abstract

The Artificial Accelerograms have been developed for assessing the dynamic response of
structures. Considering seismological properties of the site are necessary for the best simulation of
accelerograms. The real recorded accelergrams for simulating earthquake phenomenon are used in the
Arma model. This is due to the fact that the Arma model can be considered more advantageous than the
others.
In this paper, 25 recorded accelerograms are used for simulating accelerograms of a dam site in
Hamedan province in western Iran. The parameters which are used in the stationary transformation are
related to the physical parameters (eg. magnitude, epicentral distance and duration) via a regression
analysis. To generate Artificial Accelerogram, the physical parameters enter the Arma model, therefore
the output would be a stationary time history adjusted with recorded accelerograms. The generated
stationary time history is changed into a non-stationary time history from the amplitude and frequency
point of view.

Keywords