33 Comparative Study on Modal Identification of a 10 Story RC Structure Using Free, Ambient and Forced Vibration Data 273 Table 33.3 Summary NExT-ERA system identification on ambient vibration measurements Ambient vibration case 1 2 3 4 5 6 Free vibration Forced vibration Damage state Mode Identification order Frequency (Hz) Identification order Frequency (Hz) Identification order Frequency (Hz) Identification order Frequency (Hz) Identification order Frequency (Hz) Identification order Frequency (Hz) Average identification order Average frequency (Hz) Average frequency (Hz) DS0 1 44 2.26 44 2.26 N/Ia N/Ia 46 2.24 68 2.26 N/Ia N/Ia 11 2.23 2.23 2 36 3.34 36 3.34 40 3.31 36 3.34 48 3.35 N/Ia N/Ia 16 3.31 3.32 3 110 4.69 108 4.69 N/Ia N/Ia 106 4.68 140 4.69 N/Ia N/Ia 44 4.65 4.66 4 36 7.37 36 7.37 N/Ia N/Ia 36 7.36 30 7.32 66 7.35 33 7.35 N/A DS1 1 14 2.24 14 2.24 84 2.26 14 2.25 24 2.24 88 2.25 13 2.21 2.23 2 42 3.33 42 3.33 78 3.30 42 3.32 54 3.34 144 3.33 24 3.26 3.30 3 42 4.71 44 4.67 76 4.73 42 4.72 56 4.72 80 4.71 35 4.70 4.71 4 34 7.37 38 7.37 50 7.31 48 7.37 94 7.36 N/Ia N/Ia 35 7.32 N/A DS2 1 22 2.19 22 2.18 N/Ia N/Ia 22 2.18 24 2.18 88 2.20 21 2.16 2.17 2 16 3.25 16 3.25 18 3.25 14 3.25 18 3.25 54 3.25 20 3.20 3.24 3 8 4.71 8 4.71 54 4.68 6 4.71 14 4.71 90 4.71 30 4.67 4.68 4 40 7.40 46 7.37 76 7.39 42 7.38 28 7.34 68 7.33 46 7.38 N/A DS3 1 48 2.11 48 2.11 146 2.10 40 2.12 56 2.12 N/Ia N/Ia 22 2.07 2.09 2 24 3.10 24 3.10 26 3.10 26 3.10 28 3.11 112 3.11 27 3.05 3.08 3 6 4.65 6 4.65 6 4.65 6 4.65 6 4.65 6 4.66 19 4.64 4.66 4 6 7.30 6 7.30 90 7.25 10 7.33 10 7.32 8 7.33 30 7.23 N/A aThe mode was not identified
RkJQdWJsaXNoZXIy MTMzNzEzMQ==