Free-Decay Nonlinear System Identification via Mass-Change Scheme

Table 5

Identified modal parameters of the multistory building.

Mode	Frequency (Hz)			Damping (%)
	Unmodified	Set I	Set II	Unmodified
1	3.49	3.02	3.06	0.49
2	6.11	5.46	6.08	0.48
3	10.20	8.93	8.61	0.25
4	14.38	13.34	14.31	0.18
5	27.00	26.61	26.85	0.53