Free-Decay Nonlinear System Identification via Mass-Change Scheme

Table 6

Identified modal masses of the multistory building.

Mode	Identified modal mass (kg), output-only NSI	Identified modal mass (kg), SSI	Difference (%)
1	5.47	5.69	4.05
2	6.82	6.26	8.20
3	3.94	3.83	2.67
4	1.34	1.37	2.44
5	0.79	0.47	39.48