Shaking Table Tests for Seismic Response of Orthogonal Overlapped Tunnel under Horizontal Seismic Loading

Table 6

Peak acceleration and frequency of the invert at the central cross section of the upper-span tunnel.

Transformation scale	Peak acceleration (m/s^2)		Corresponding time (s)	Main frequency band (Hz)	Dominant frequency (Hz)
Original signal	0.23	—	40.56	5–48	26	—
1	0.05	0.22	51.25	10–50	46	1.77
2	0.11	0.48	53.56	52–83	74	2.92
5	0.28	1.22	51.26	14–47	32	1.23
10	0.30	1.30	51.72	18–30	15	0.57
20	0.11	0.22	48.47	7–13	9	0.35
50	0.05	0.48	48.51	3–6	5	0.19