Vibration-Based Damage Detection of a Steel-Concrete Composite Slab Using Non-Model-Based and Model-Based Methods

Table 1

Comparison of the identified modal information for Case 1 and Case 2.

No.	Ref Case I		Case 1			Case 2
	Freq. (Hz)	Damp. (%)	Freq. (Hz)	Damp. (%)	Diff. (%)	Freq. (Hz)	Damp. (%)	Diff. (%)
1	20.01	2.47	18.76	−3.08	−6.25	19.40	2.71	−3.05
2	25.32	1.52	24.06	−1.80	4.98	24.93	2.02	−1.54
3	31.74	1.72	30.89	−1.67	2.68	31.37	1.54	−1.17
4	69.40	6.80	65.63	−2.71	5.43	69.50	8.03	0.14
5	74.54	4.11	—	—	—	73.75	3.05	−1.06
6	82.33	2.34	85.68	−2.43	4.07	82.10	2.07	−0.28
7	110.61	4.60	103.40	−3.76	6.52	—	—	—
8	113.50	3.19	117.55	−3.49	3.57	111.43	3.68	−1.82
9	154.39	2.75	149.80	−3.80	2.97	150.13	3.69	−2.76

Note. , f₁ is the measured frequency of Case 1 or Case 2, and f_r1 is the measured frequency of Ref Case I.