Dynamic Performance Analysis of a Curved Cable-Stayed Bridge Based on the Direct Method and the Sensitivity-Based Iterative Method

Table 5

Comparison of the experimental modal data between 2010 and 2011.

Mode	f 2010 (Hz)	f 2011 (Hz)	△f (%)	MAC	Type
1	0.635	0.635	0.0	0.99	Vertical bending
2	0.996	0.996	0.0	0.98	Vertical bending
3	1.143	1.143	0.0	0.96	Vertical bending
4	1.387	1.387	0.0	1.00	Torsion
5	1.523	1.523	0.0	0.98	Bending-torsion
6	1.602	1.602	0.0	0.99	Bending-torsion
7	1.953	1.963	0.5	0.99	Vertical bending
8	2.637	2.646	0.3	0.98	Torsion
9	3.174	n.a.	—	—	Torsion
10	4.053	4.072	0.5	0.95	Torsion
11	4.932	4.951	0.4	0.84	Torsion
12	n.a.	5.332	—	—	Torsion
13	5.596	5.625	0.5	0.84	Torsion
14	n.a.	5.880	—	—	Bending-torsion
15	6.826	6.840	0.2	0.97	Torsion