Seismic Response Analysis of Nuclear Island Buildings on Non-rock Foundation

Abstract

A key technical problem of seismic response analysis of nuclear island buildings under the condition of non-rock foundation is the effective simulation of soil-structural interaction (SSI) and the nonlinear characteristics of soil. A seismic response analysis calculation model of nuclear island buildings on non-rock foundation is established on the basis of software platform of SuperFLUSH, which adopts equivalent linear method to describe the nonlinear dynamic characteristics of the near field ground, by setting viscous artificial boundary in the limited area of foundation to simulate the impact of radiation damping, and takes advantage of one-dimensional finite element method to make a response analysis of free field for the ground motion input. At last, by taking calculation model of CPR1000 nuclear reactor on the non-rock foundation as the object of study, the numerical examples verify the reliability and engineering application of the established model. Furthermore, the results of study can provide reference for seismic analysis of adaptability of inland nuclear power plant foundation and optimization design of foundation treatment scheme under the condition of non-rock foundation.