Abstract
Seismic site response analysis is required to determine the response of ground and estimating the free field response spectra for future design purposes. The seismic site response analysis is generally performed in a deterministic way. The uncertainties of the parameters used to develop the subsoil model are high and hence, the execution of a deterministic analysis of the seismic amplification does not properly represent the response of a site. In the present study, a detailed stochastic method with uncertainty modelling for 1D site response analysis is proposed. Monte Carlo simulation is effectively used to model the various uncertainties in input parameters. The uncertainties in input ground motion, shear wave velocity, layer thickness and non-linear soil properties are modelled in the analyses. Stochastic 1D seismic site response analysis is attempted in the present study and parametric study has been performed. The proposed methodology is then used effectively to carry out the parametric study to investigate the sensitivity and uncertainty of parameters used in the seismic site response analysis. The influence of input ground motion, uncertainty in shear wave velocity, uncertainty in shear modulus reduction curve and damping curve has been checked in the present study. Rigorous analyses on large number of profiles for each parameter have been carried out.
