Table 6: Modal identification of Baicheng Footbridge by SSI.

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

12.2920.542.2601.241.4256.5Deck 1st vertical and radial bending0.997
24.0420.534.0670.880.6139.8Deck bending and bridge tower bending
35.3190.415.3230.400.082.5Deck 2nd vertical bending0.998
47.4310.957.4460.890.206.7Deck 2nd radial bending0.892
59.4780.679.4400.880.4023.9Deck 3rd vertical and radial bending0.999