Complexities in Assessing Structural Health of Civil Infrastructures

Table 1

Stiffness parameter identification of 3D single-story frame.

(a) Identification of substructure using 3D ILS-UI

Member	Actual (); (kN-m)	Defect-free		Defect 1		Defect 2
		Identified ()	Change (%)	Identified ()	Change (%)	Identified ()	Change (%)
	13476.2	13475.8		13475.9		13475.8
	13476.2	13473.9		13473.9		13473.9
	14552.9	14551.7		14551.7		14551.8

(b) Identification of whole structure using 3D UKF-WGI

Member	Actual (); (kN-m)	Defect-free		Defect 1		Defect 2
		Identified ()	Change (%)	Identified ()	Change (%)	Identified ()	Change (%)
	13476	13471		13462		13349
	13476	13471		10744	−20.27	13655	1.32
	13476	13473		13468		13471
	13476	13475		13495	0.14	12901	−4.26
	14553	14550		14543		14554	0.01
	14553	14551		14558	0.03	14546
	14553	14548		14543		14471
	14553	14547		14549		14514