one-dimensional site response reliability assessment of damped soil: a comparative study

ground motion time histories can be significantly affected by the local subsurface geology and morphology.to evaluate the reliability of the results, the estimation of uncertainties is essential. the uncertainties come from the input site parameters as well as from the numerical model. in this research, site parameters uncertainty is considered. for this purpose, a computer program was coded by matlab and the point estimate method is used for assessing reliability site response. the results are compared with the monte carlo simulation. damped soil on rigid rock and elastic rock are selected as two different conditions for comparison. the selected stochastic parameters are damping, shear wave velocity, density and thickness of the soil layer for elastic bedrock condition. as well as damping, shear wave velocity and density of rock for rigid bed. the circular frequency is regarded as a constant parameter in each step of ground response analysis in the frequency domain. comparison of the results indicates the soil layer on rigid rock has higher magnification on the input motion against the soil layer on elastic rock.