Table 8: Modal identification of Wuyuan Bridge by SSI.

 ModeWirelessTethered Frequency difference (%) Damping difference (%)Descriptions
of mode shape
(Hz) (%) (Hz) (%)

10.7751.930.7751.56023.71st vertical bending (antisymmetric)
21.2301.361.2321.370.160.71st lateral bending (symmetric)
31.2540.641.2511.320.2451.52nd vertical bending (symmetric)
41.6031.521st torsion (anti-symmetric)
51.7070.911.7121.710.2946.83rd vertical bending (symmetric)
61.8981.631.8671.061.6653.82nd torsion (symmetric)
72.4291.972.4252.310.1614.73rd torsion (symmetric)
82.8722.382.6831.507.0458.74th vertical bending (anti-symmetric)
93.2951.593.3131.700.546.55th vertical bending (symmetric)