Vehicle–Bridge Interaction Dynamic Analysis of Continuous Rigid Frame Composite Box Girder Bridge with Corrugated Steel Webs under Seismic Excitation

Table 3

First six natural frequencies and modes of the Xiaoshagou bridge.

Model state	Frequency (Hz)	Period (s)	Vibration mode
1	0.49890	2.0044	First-order transverse bend
2	0.64844	1.5421	First-order side-shift
3	1.0459	0.9561	Second-order antisymmetric transverse bends
4	1.4676	0.6814	Third-order horizontal bend
5	1.5457	0.6470	First-order antisymmetric vertical bend
6	1.9735	0.5067	Second-order symmetric vertical bend