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

Table 2

Comparison of the identified modal information for Cases 3, 4, and 5.

Mode	Ref Case II		Case 3			Case 4			Case 5
	Freq. (Hz)	Damp. (%)	Freq. (Hz)	Damp. (%)	Diff. (%)	Freq. (Hz)	Damp. (%)	Diff. (%)	Freq. (Hz)	Damp. (%)	Diff. (%)
1	25.30	0.99	25.09	1.47	−0.83	22.17	1.91	−12.37	19.15	2.21	−24.31
2	33.49	1.93	33.32	1.03	−0.51	31.70	2.58	−5.34	28.46	1.99	−15.02
3	67.76	1.75	67.56	2.26	−0.30	65.24	2.31	−3.72	63.70	2.07	−5.99
4	77.89	2.58	76.31	2.65	−2.03	73.14	3.32	−6.10	70.63	2.77	−9.32
5	84.71	1.43	83.09	1.25	−1.91	80.02	1.54	−5.54	79.74	1.65	−5.87
6	99.49	3.86	97.42	4.24	−2.08	95.46	5.38	−4.05	97.17	2.83	−2.33
7	125.37	3.12	121.13	2.82	−3.38	119.56	3.10	−4.63	117.25	2.52	−6.48
8	136.85	3.52	132.91	3.03	−2.88	130.11	3.17	−4.93	136.85	2.96	0.00
9	165.26	3.33	167.44	3.25	1.32	162.74	2.87	−1.52	161.51	3.61	−2.27

Note. , f₂ is the frequency of Cases 3, 4, or 5, and f_r2 is the frequency of Ref Case II.