Girder Longitudinal Movement and Its Factors of Suspension Bridge under Vehicle Load

Table 3

The vibration modes of the Aizhai Bridge.

Mode no.	Frequency (Hz)		Mode shape
	FEM res.	Field test res [29]
1	0.0562	Not available	1st symmetric lateral
2	0.1158	0.1005	1st antisymmetric vertical + longitudinal floating
3	0.1408	0.1443	1st antisymmetric lateral
4	0.1595	0.1759	1st symmetric vertical
5	0.2126	0.2030	2st symmetric vertical
6	0.2540	0.2822	2st antisymmetric vertical + longitudinal floating
7	0.2939	0.3189	1st symmetric torsional