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 andmorphology. To evaluate the reliability of the results, the estimation of uncertainties is essential. Theuncertainties 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 byMATLAB and the point estimate method is used for assessing reliability site response. The results arecompared with the Monte Carlo simulation. Damped soil on rigid rock and elastic rock are selected astwo different conditions for comparison. The selected stochastic parameters are damping, shear wavevelocity, density and thickness of the soil layer for elastic bedrock condition. As well as damping, shearwave velocity and density of rock for rigid bed. The circular frequency is regarded as a constantparameter in each step of ground response analysis in the frequency domain. Comparison of the resultsindicates the soil layer on rigid rock has higher magnification on the input motion against the soil layeron elastic rock

Keywords:

Site response , Reliability , Monte Carlo simulation , Point estimate method , Ground motion , Stochastic