In the structural design and safety assessment of nuclear power plant

it is of great significant to analyze the seismic response of containment. Based on the three-dimensional finite element model of the containment

the nonlinear seismic response analysis is carried out at the ultimate safety ground motion

especially the seismic response spectrum of some floors are calculated by the time history method. In addition

the effect of different target damping ratios on the floor response spectrum were analyzed and compared. It is indicated that the detailed 3D finite element model is capable to reflect the actual response of structures and ensure the integrity at the ultimate safety ground motion. The structural response spectrum of structure obtained from the analysis could be used as the input data of the substructure seismic analysis.