Research Article
A Study on Instantaneous Time-Frequency Methods for Damage Detection of Nonlinear Moment-Resisting Frames
Table 4
Feature indexes for intensity levels.
| | Damage | Level 1 | Level 2 | Level 3 | Level 4 | Level 5 | Level 6 | Level 7 |
| | -direction | | Frequency | 0 | 1.940 | 4.193 | 5.643 | 6.019 | 6.292 | 6.189 | | Amplitude | 0 | 4.982 | 16.044 | 44.701 | 75.828 | 109.658 | 143.224 | | Energy | 0 | | | | | | |
| | -direction | | Frequency | 0 | 2.904 | 5.648 | 8.658 | 9.434 | 9.434 | 9.468 | | Amplitude | 0 | 6.550 | 21.424 | 60.805 | 104.836 | 154.087 | 202.991 | | Energy | 0 | | | | | | |
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