Abstract
Dynamic earthquake response of subsurface ground, with spatially varied shear modulus was examined with the aid of Monte-Calro simulation. Through the series of simulations, it turned out that spatially varied soil property does not necessarily cause variable dynamic responses. Dynamic response of ground is dominated by 1st vibration mode, which means the ground motion is controlled by 1st eigen frequency. As long as 1st eigen frequency is not variable, even though the shear modulus varies spatially, the dynamic response cannot be variable. Besides, it was shown that Monte-Carlo simulation results distributes around deterministic analysis results carried out with uniformly changed shear modulus, and that deterministic analysis results can be utilized to estimate probabilistic behavior of dynamic earthquake response of subsurface ground with spatially varied shear modulus.
