Research on Collapse Process of Cable-Stayed Bridges under Strong Seismic Excitations

Table 4

Natural frequencies and modal characteristics.

Order number	Period	Frequency	Modal characteristics
1	3.382	0.29569	Longitudinal floating vibration
2	2.557	0.39102	Lateral bending vibration
3	2.421	0.41310	Antisymmetric lateral bending vibration
4	2.157	0.46364	Vertical bending vibration
5	1.991	0.50236	Lateral bending vibration
6	1.310	0.76341	Longitudinal bending vibration of auxiliary pier
7	1.276	0.78358	Antisymmetric vertical bending vibration
8	1.231	0.81228	Antisymmetric lateral bending vibration
9	1.223	0.81749	Lateral bending-torsional coupling vibration
10	1.060	0.94335	Torsional vibration