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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Takanori HARADA, Masanobu SHINOZUKA
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STOCHASTIC ANALYSIS OF GROUND RESPONSE VARIABILITY FOR SEISMIC DESIGN OF BURIED LIFELINE STRUCTURES
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The ground response variabilities in space and time, especially in space, have been analysed using a stochastic ground surface model. The intent is to quantify the spatial variation of ground motions for seismic analysis and design of buried lifeline structures such as gas or water supply pipeline. The ground is assumed to be infinitely horizontal soil layers with stochastic soil thicknesses and soil properties which are supported on rigid base rock. The earthquake motion is subjected to the ground from rigid base rock with time lag x/c where x = horizontal coordinate and c = wave speed in x-direction. From this study, it is found that the spatial correlation function of response displacement at ground surface is a function of response velocity spectrum, spatial correlation function of predominant ground frequency, mean value of equivalent damping ratio of ground, mean value of predominant ground frequency, and wave speed in horizontal direction.
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