Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements

Table 4

Comparison of the damping ratios estimated using the two approaches.

Floor number	1st translational mode in E-W direction			1st translational mode in N-S direction
	Damping; (RD + CWT)	Damping; (RD only)	Difference; (%)	Damping; (RD + CWT)	Damping; (RD only)	Difference; (%)
1	2.950	3.006	1.9	2.069	2.156	4.2
2	2.526	3.079	21.9	2.195	2.597	18.3
3	2.761	2.710	1.8	2.109	2.100	0.4