Modeling of Temperature Effect on Modal Frequency of Concrete Beam Based on Field Monitoring Data

Table 4

Variability of first four modal frequencies before and after eliminating temperature effect.

Mode	Standard deviation (Hz)			Variation coefficient (%)
	Before	After	Ratio	Before	After	Ratio
1st	2.16	0.46	21.30	4.28	0.92	21.50
2nd	17.04	2.82	16.55	11.48	2.05	17.86
3rd	32.67	3.91	11.97	6.54	0.82	12.54
4th	29.56	4.39	14.85	4.05	0.62	15.31

Note. Ratio = after/before 100%.