Study on the Effect and Mechanism of Aerodynamic Measures for the Vortex-Induced Vibration of Separate Pairs of Box Girders in Cable-Stayed Bridges

Table 1

Natural vibration frequencies and vibration modes description of primary vibration modes of the bridge.

Vibration; mode number	Frequency; (Hz)	Description of vibration modes
1	0.3435	Antisymmetrical vertical bending of main girder
2	0.4759	Symmetrical vertical bending of main girder
4	0.7529	Antisymmetrical side bending of main girder
6	0.8719	Side tower equidirectional side vibration
7	0.8840	Reverse side vibration of side tower
8	0.9119	Symmetrical side bending of main girder + reverse side vibration of side tower
10	0.9423	Symmetrical torsion of main girder
11	0.9449	Antisymmetrical torsion of main girder
13	0.9795	Side vibration of middle tower