Numerical Study on the Seismic Response of Structure with Consideration of the Behavior of Base Mat Uplift

Table 5

The first five natural frequencies and corresponding vibration mode.

Order	1	2	3	4	5
Frequency/Hz	1.9581	7.4998	10.961	12.309	14.572
Vibration Mode	Horizontal	Horizontal	Structure torsion about vertical axis	Floor torsion about vertical axis	Vertical