Finite Element Model Updating of Bridge Structures Based on Improved Response Surface Methods

Table 3

Comparison of natural frequencies of the simply supported beams based on different model updating methods.

Frequency	True value (Hz)	Initial (Hz)	Error (%)	Traditional response surface method		Improved response surface method
				Updated (Hz)	Error (%)	Updated (Hz)	Error (%)
1st	0.896	0.920	2.625	0.903	0.728	0.897	0.059
2nd	2.436	2.522	3.509	2.448	0.472	2.435	0.062
3rd	4.805	4.913	2.243	4.793	0.254	4.816	0.225
4th	7.924	8.056	1.668	7.922	0.023	7.926	0.028