Shock and Vibration / 2017 / Article / Tab 3

Research Article

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

Table 3

Natural frequencies and damping ratios estimated from ambient vibration tests.

CasePeak acc.
(×10−2 m/s2)
FrequencyDamping ratio
f (Hz) (Hz)COV (%)ζ (%) (%)COV (%)

10.903.400.0010.0290.10.0110.0
20.273.920.0010.0262.00.052.6
30.504.070.0020.0491.90.073.7
40.473.950.0010.0251.30.043.0
50.634.420.0010.0231.50.010.7
60.863.900.0010.0261.70.095.3
71.434.270.0070.1630.90.066.5
81.003.590.0050.1391.20.129.9
90.853.760.0030.0801.30.053.9
100.524.650.0060.1291.90.021.1

Note: f denotes mean value of natural frequency;  ζ  denotes mean value of damping ratio;  σ  denotes standard deviation; and COV denotes coefficient of variation = standard deviation/mean.