Structural Damage Detection Based on Modal Parameters Using Continuous Ant Colony Optimization

Table 9

Statistical results for damage detection in 3-bay and 4-storey frame structure.

Damage case	Detected damage amounts
	15% @ 1		10% @ 2		15% @ 5		20% @ 21
	Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.	Mean	Std. Dev.
Noise free data
Single element	15.00
Two element	15.00		10.00
Four element	15.00		10.00		15.00		20.00
0.5% noise in natural frequency and 5.0% noise in mode shape data
Single element	9.14
Two element	9.73		15.20
Four element	8.46		14.41		9.40
1.0% noise in natural frequency and 10.0% noise in mode shape data
Single element	11.10
Two element	11.87		14.07
Four element	13.66		13.81		10.30		20.43