Dynamic Characteristics of a Double-Pylon Cable-Stayed Bridge with Steel Truss Girder and Single-Cable Plane

Table 3

The comparison between measured frequencies and calculated frequencies.

Mode number	Measured frequencies (Hz)	Calculated frequencies 1 (Hz)	Calculated frequencies 2 (Hz)	Mode shape
1	0.35	0.32	0.24	The 1st-order cross bending of the main span of the girder
2	0.43	0.38	0.31	The 1st-order symmetrical vertical bending of the girder
3	0.69	0.53	0.47	The 2nd-order symmetrical vertical bending of the girder
4	0.73	0.63	0.58	The bending torsion-coupling of the left span of the girder
5	0.91	0.73	0.61	The 1st-order symmetrical bending of the girder

Note. Calculated frequencies 1, calculated by the FE model 1; calculated frequencies 2, calculated by the FE model 2.