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

Table 6

Comparison of modal data before and after model updating.

Order	Measured	Initial model			Updating model
	Freq. (Hz)	Freq. (Hz)	Diff. (%)	MAC	Freq. (Hz)	Diff. (%)	MAC
1	24.78	23.67	−4.48	0.966	24.68	−0.40	0.977
2	31.26	31.30	0.13	0.959	30.79	−1.51	0.964
3	56.77	62.16	9.49	0.503	59.37	4.91	0.612
5	82.68	76.20	−7.84	0.870	78.55	−4.99	0.919
7	120.01	114.42	−4.66	0.755	122.52	2.09	0.788

Note. , f_m is the measured frequency of the composite deck, and f₃ is the frequency of the initial or updated model.