GENERATION OF EARTHQUAKE FOR DIFFERENT GROUND CHARACTERISTICS

Abstract

This investigation primarily deals with the effect of soil characteristics on the ground motion. A large number of earthquake accelerograms with varying. soil characteristics have been generated on digital computer and corresponding ground acceleration spectra were studied. A nonstationary process is used to simulate the bad rock acceleration. The bed rock acceleration is then filtered through the soil deposit to get the ground acceleration. The filter parameters depend upon the characteristics of the soil deposit. •Statistical characteristics of the ground acceleration have 'beon studied t ith respect to the base rock acceleration. It is observed that rate of zero crossings of the ground motion decreases as the period of the soil layer is increased. Predominant period also increases with the increase of period of soil deposit. The maxi-mum ground acceleration varies with the fundamental period of the soil deposit. The maximum ground accele.-ration shows a regular decrease, as the damping of the soil layer is increased.