Research Article
Effects of Precast Cladding Systems on Dynamic Characteristics of Steel Frame Buildings by Ambient and Free Vibration Tests
Table 4
Natural frequencies and damping ratios estimated from free vibration tests.
| | Case | Peak acc.
(×10−2 m/s2) | Frequency | Damping ratio
ζ (%) | | f (Hz) | (Hz) | COV (%) |
| | 1 | 96.2 | 3.41 | 0.007 | 0.21 | 0.1~0.5 | | 2 | 36.1 | 3.63 | 0.132 | 3.64 | 1.5~3.2 | | 3 | 32.5 | 3.77 | 0.128 | 3.40 | 1.3~3.1 | | 4 | 33.5 | 3.81 | 0.146 | 3.83 | 0.8~3.4 | | 5 | 32.1 | 4.16 | 0.118 | 2.84 | 0.8~3.0 | | 6 | 44.9 | 3.70 | 0.106 | 2.86 | 0.7~2.8 | | 7 | 39.8 | 3.95 | 0.100 | 2.53 | 0.5~2.7 | | 8 | 94.0 | 3.44 | 0.042 | 1.22 | 0.5~2.0 | | 9 | 94.3 | 3.53 | 0.048 | 1.36 | 0.5~2.2 | | 10 | 21.9 | 4.53 | 0.134 | 2.96 | 0.9~3.5 |
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Note: f denotes mean value of natural frequency; σ denotes standard deviation; and COV denotes coefficient of variation.
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