Identification of modal parameters of long-span bridges under various wind velocities

Advances in Bridge Engineering

Table 2 Statistics of fitting parameters of identified modal damping ratios of PSRB and XB

Bridge	Mode order	Identification method						Recommended structural damping (%)
		SSI-COV			EWT-HT
		a₂	b₂	R²	a₂	b₂	R²
PSRB	1	0.0286	0.382	0.549	0.0251	0.327	0.645	0.500
	2	0.0221	0.857	0.199	0.0196	0.909	0.323	0.500
	3	0.0023	0.720	0.022	0.0063	1.158	0.063	0.500
XB	1	0.0326	0.667	0.398	0.0561	0.759	0.563	0.500
	2	0.0052	0.709	0.080	0.0369	0.251	0.771	0.500
	3	0.0077	0.195	0.249	0.0309	0.076	0.755	0.500