Research Article
Delamination Detection of Reinforced Concrete Decks Using Modal Identification
Table 6
Modal frequencies identified by PP, FDD, and SSI (
,
) methods from experimental specimens under random excitation.
| — | — | 1st bending | 2nd bending | 1st bending/torsion | 3rd bending |
| | PP (Hz) | 31.60 | 68.88 | 84.66 | 165.95 | Undamaged | FDD (Hz) | 31.77 | 68.03 | 83.04 | 166.08 | | SSI (Hz) | 31.61 | 67.62 | 82.60 | 166.37 |
| | PP (Hz) | 26.69 | 51.00 | — | 92.07 | 22.2% delaminated | FDD (Hz) | 27.01 | 50.77 | — | 91.79 | | SSI (Hz) | 26.83 | 50.67 | — | 91.74 |
| | PP (Hz) | 27.60 | 55.94 | — | 96.79 | 51.9% delaminated | FDD (Hz) | 27.51 | 54.53 | — | 96.80 | | SSI (Hz) | 27.56 | 55.52 | — | 96.94 |
| | PP (Hz) | 24.41 | 44.69 | — | 84.38 | 74.1% delaminated | FDD (Hz) | 24.01 | 44.77 | — | 84.54 | | SSI (Hz) | 24.31 | 44.37 | — | 84.63 |
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