ABSTRACT
In this paper, the finite element models of a plant in a nuclear power project are established, and the model analysis is conducted to obtain the mode shapes and activated modal mass ratios under different natural frequencies. Then, the floor response spectrums of the plant are calculated by the time-history method. Major characteristics of the floor response spectrums, such as peak acceleration and zero period acceleration, are analysed. Results show that the vertical floor response spectrums have obvious differences at different locations on the same floor. The centre of the floor has the largest peak acceleration and zero period acceleration of the vertical response spectrums, and the connection between the floor and wall has the smallest. By contrast, the horizontal floor response spectrums have little difference at different locations on the same floor. Therefore, in order to ensure safe operation, important equipment should be avoided to install in the centre of the floor.
