Research Article
Online Modal Identification of Concrete Dams Using the Subspace Tracking-Based Method
Table 3
Some time-invariant modal identification results of the Pacoima dam.
| | Earthquake | Identification method | Frequency (Hz) | Damping ratio | | Mode 1 | Mode 2 | Mode 3 | Mode 1 | Mode 2 | Mode 3 |
| | San Fernando | Optimization method [8] | — | 4.73 | 5.06 | — | 6.2% | 6.6% | | San Fernando | 4 spectra [32] | 3.6–3.7 | 4.8–5.0 | 5.1–5.3 | 2.74% | 2.48% | 2.41% | | Chino Hills | ARX model [22] | — | 5.40 | 5.75 | | | |
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