An Experimental Study of Structural Identification of Bridges Using the Kinetic Energy Optimization Technique and the Direct Matrix Updating Method

Table 6

FE analysis results per DOF of cable-stayed bridge model using EOT.

Target mode		1st bending		2nd bending		3rd bending
DOF	Reduction (%)	Freq. (Hz)	Error (%)	Freq. (Hz)	Error (%)	Freq. (Hz)	Error (%)
39 (full)	—	9.1719	—	11.2544	—	16.8643	—
30	23.07	9.1728	0.0009	11.2567	0.0204	16.8691	0.0284
25	35.89	9.1757	0.0414	11.2651	0.0950	16.8856	0.1263
20	48.71	9.1890	0.1864	11.3049	0.4487	16.9834	0.7062
15	61.53	9.2219	0.5451	11.7537	4.4364	17.2843	2.4904
10	74.35	9.3253	1.6724	11.7537	4.4364	18.1914	7.8692
5	87.17	9.5531	4.1561	12.3951	10.1355	18.8781	11.9412