French Operating NPP Design Floor Response Spectra : Margins Related to Soil-Structure Interaction

摘要

Since operating NPP have been designed, state of art in calculation of seismic actions have considerably evolved.Simultaneously the need to demonstrate that margins exist in the seismic design has grown up. These paper tries toinvestigate the margins that can be found by applying modern calculation techniques to the modelling of actual dynamic soilconditions.An example study first exhibits the significant margins that can be found on typical alluvium site conditions. Marginsresult both from the enveloping standard design assumptions and from the important role of foundation depth.In addition, some recent research investigations on the effect of spatial variation of incident seismic motion are shortlyreported. They tend to show that, although modern techniques allow to take into account actual dynamic soil properties, somemargins may still remain, especially on typical wide footprint buildings as those of future NPP projects.