Effects of Precast Cladding Systems on Dynamic Characteristics of Steel Frame Buildings by Ambient and Free Vibration Tests

Table 5

Comparison of dynamic parameters estimated from ambient and free vibration tests.

Case	Natural frequency			Damping ratio
	AVT (Hz)	FVT (Hz)	AVT/FVT	AVT (%)	FVT (%)	AVT/FVT
1	3.40	3.41	1.00	0.1	0.20	0.50
2	3.92	3.63	1.08	2.0	2.7	0.72
3	4.07	3.77	1.08	1.9	2.4	0.78
4	3.95	3.81	1.04	1.3	2.4	0.56
5	4.42	4.16	1.06	1.5	2.4	0.63
6	3.90	3.70	1.05	1.7	2.2	0.78
7	4.27	3.95	1.08	0.9	2.2	0.43
8	3.59	3.44	1.04	1.2	0.8	1.51
9	3.76	3.53	1.07	1.3	1.0	1.27
10	4.65	4.53	1.03	1.9	2.4	0.79