The Dynamic Response Analysis of Pseudo Three Dimensional of Nuclear Island Plant Structure under Non-lithology Foundation Condition

Abstract

Building nuclear power plant structure on lithology ground or soft ground has become an inevitable and popular trend in the development of nuclear island plant structure. It leads the seismic analysis of non-lithology foundation to be the key technical issues to choose the nuclear power plant site. In order to solve the engineering practicality issues of seismic analysis of non-lithology foundation and the issues of simplifying the complex nuclear power plant structure, the three- dimensional (3D) finite element model of the AP1000 nuclear power plant structure has been simplified to two-dimensional model in this paper based on ANSYS software. The principle of the simplification is that the mass and stiffness of models should be equivalent. Then establish the pseudo 3D model in SuperFLUSH software to explore the mechanism of the earthquake loads and seismic response characteristics of nuclear power plant structure. Finally, compare the frequency characteristics and compare the true three-dimensional results of SASSI software with the results of SuperFLUSH software to verify the rationality and effectiveness of the simplification.