Parametric studies for seismic analysis of Sizewell ‘B’ power station

Response spectra have been generated for Sizewell ‘B’ using a soil spring method for representing soil-structure interaction. Due to the complexity of the seismic analysis problem, certain simplifying assumptions are made in the analysis route used to generate design spectra. The importance of these effects has been considered by a series of parametric studies which are used to determine whether the effects need to be considered explicitly in the analysis method used to generate design spectra.