Damage Detection of Bridges Using Vibration Data by Adjoint Variable Method

Table 5

Damage scenarios for grid model.

Damage scenario	Damage type	Damage location	Reduction in elastic modulus	Noise
M2-1	Single	41	7%	Nil
M2-2	Multi	3, 26, 35, and 40	9%, 14%, 3%, and 8%	Nil
M2-3	Multi	5, 7, 12, 15, 24, and 37	4%, 11%, 6%, 2%, 10%, and 16%	Nil
M2-4	Random	All elements	Random damage in all elements with an average of 5%	Nil
M2-5	Random	All elements	Random damage in all elements with an average of 15%	Nil
M2-6	Estimation of undamaged state	All elements	5% reduction in all elements	Nil