Mass-Stiffness Combined Perturbation Method for Mode Shape Monitoring of Bridge Structures

Table 2

Natural frequencies of the FEM analysis and the laboratory test (Hz).

Scenarios		Mode no.
		First	Second	Third	Fourth
FEM analysis	Intact	19.461	76.727	167.245	275.853
	D-1	19.405	76.720	166.825	275.830
	D-2	19.344	76.712	166.367	275.805
	D-3	19.275	76.704	165.866	275.777
	D-4	19.200	76.695	165.314	275.745
Laboratory test	Intact	19.461	76.575	165.648	281.351
	D1	19.312	75.951	162.699	280.012
	D2	19.180	75.601	161.789	279.330
	D3	19.111	75.259	161.466	278.582
	D4	19.089	75.518	160.288	278.823