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

Table 1

Natural frequency of the structure (in Hz).

Mode	Undamaged structure			Single damage case	Double damage case
	Experimental	Analytical	Updated
1st	16.41	17.4722	16.5412	16.25	16.24
2nd	103.63	109.4966	103.6623	103.99	103.32
3rd	290.00	306.5980	290.2616	289.52	288.60
4th	567.76	600.8375	568.8231	564.38	563.76
5th	938.31	993.3336	940.4060	932.63	924.87