Structural Health Monitoring of Precast Concrete Box Girders Using Selected Vibration-Based Damage Detection Methods

Table 1

Comparison of FE and experimental natural frequencies and mode shapes for the undamaged system.

Parameter	Mode
	1 (flexural)	2 (flexural)	3 (torsional)	4 (flexural)
Natural Frequencies (Hz)
Experimental model	7.61	26.3	31.7	57.9
Finite element model	7.58	27.23	36.46	58.95
Relative error (%)	−0.4	3.5	15.0	1.8
Modal Assurance Criteria:	0.9999	0.9967	0.9882	0.9865