Damage Detection of Bridge Structure Based on SVM

Table 1

The calculation results of natural vibration frequency of the pier.

Working condition	Foundation depth (m)	Frequency (Hz)	Frequency reduction (Hz)	Relative frequency reduction (Hz)
Original state	4.0	7.02	/	/
Digging 1 m	3.0	6.67	0.34	0.34
Digging 2 m	2.0	6.45	0.57	0.23
Digging 3 m	1.0	6.31	0.71	0.14