Free-Decay Nonlinear System Identification via Mass-Change Scheme

Table 7

Identified modal parameters of the multistory building, linear system identification.

Mode	Frequency (Hz)			Damping (%)
	Unmodified	Set I	Set II	Unmodified
1	3.51	3.05	3.08	0.40
2	6.12	5.42	6.10	0.21
3	10.25	8.94	8.62	0.16
4	14.35	13.34	14.29	0.25
5	27.05	26.47	26.80	0.42