Seismic Damage Analysis of Large-Span Tied-Arch Bridge with Concrete-Filled Steel Tubes Subjected to Near-Fault Ground Motion

Table 3

Modal frequencies.

Mode no.	Vibration characteristics	Frequency (Hz)
1	Transverse direction of main arch and bridge deck is symmetrically bent	0.11
2	Transverse direction of main arch and bridge deck is asymmetrically bent	0.18
3	Vertical direction of main arch and bridge is deck asymmetrically bent	0.25
4	Transverse direction of main arch and bridge deck is symmetrically bent in the opposite directions	0.29
5	First order torsion of the main arch and bridge deck	0.34
6	Second order torsion of the main arch and bridge deck	0.53