Time-Frequency Characteristics of Ground Motion and Seismic Response Analysis of Typical Structures in the Yangbi Earthquake in Yunnan Province

Table 2

First 10 natural frequencies and natural periods of the bridge structures.

Mode	Natural angular frequency (rad/sec)	Natural frequency (cycle/sec)	Natural period (sec)
1	8.213	1.307	0.765
2	8.737	1.391	0.719
3	11.445	1.822	0.549
4	14.957	2.380	0.420
5	15.356	2.444	0.409
6	17.089	2.720	0.368
7	20.840	3.317	0.301
8	25.400	4.043	0.247
9	34.298	5.459	0.183
10	40.157	6.391	0.156