Online Monitoring of Flexural Damage Index of a Cable-Stayed Bridge

Table 1

Identified temporal parameters in Z direction.

Mode no.	FE model freq. (Hz)	Measured
		Peak-picking freq. (Hz)	TDD		Modal mass × 10^4 (kg/m)
			Undamped freq. (Hz)	Damping ratio (%)	EB	WB
1	0.4207	0.3967	0.3988	0.1069	0.8577	0.8595
2	0.4943	0.5798	0.5829	0.2906	1.7323	1.6944
3	—	0.6287	0.6319	0.1259	0.8069	0.7949
4	0.7236	0.7263	0.7291	0.3199	1.4580	1.4915
5	0.9122	0.8362	0.8389	0.1801	0.9864	0.6638
6	1.0522	0.9521	0.9576	0.1072	1.5557	1.5371
7	—	1.0310	1.0396	0.3118	1.2175	1.1147
8	1.3238	1.3310	1.3141	0.3468	0.8986	0.5070
9	—	1.4100	1.4055	0.1801	1.0299	1.0110