Use of Time- and Frequency-Domain Approaches for Damage Detection in Civil Engineering Structures

Table 2

Change in the eigenfrequencies (identified by SSI).

	𝑓1		𝑓2
	Value (Hz)	Δ𝑓1 (%)	Value (Hz)	Δ𝑓2 (%)
Healthy	1.92		5.54
D1	1.87	−2.6	5.45	−1.62
D2	1.95	1.6	5.24	−5.42
D3	1.82	−5.21	5.39	−2.71
D4	1.75	−8.85	5.3	−4.33