Research Article
Delamination Detection of Reinforced Concrete Decks Using Modal Identification
Table 4
Comparison of natural frequencies of the undamaged and delaminated concrete decks for numerical example under C-F-C-F support condition.
| Mode | Undamaged | 1/6 delaminated | 1/5 delaminated | 1/4 delaminated | Mode shape | Freq | Freq | Difference | Freq | Difference | Freq | Difference | (Hz) | (Hz) | (%) | (Hz) | (%) | (Hz) | (%) |
| 1 | 1st bending | 29.19 | 28.06 | −3.87 | 27.50 | −5.79 | 25.54 | −12.51 | 2 | 2nd bending | 31.96 | 31.02 | −2.96 | 30.74 | −3.81 | 30.05 | −5.98 | 3 | 3rd bending | 41.76 | 39.82 | −4.63 | 36.82 | −11.83 | 33.23 | −20.43 | 4 | 4th bending | 60.66 | 43.60 | −28.13 | 41.32 | −31.89 | 39.89 | −34.23 | 5 | 5th bending | 73.71 | 57.95 | −21.38 | 56.44 | −23.43 | 53.08 | −28.00 | 6 | 6th bending | 76.94 | 72.13 | −6.25 | 69.77 | −9.32 | 60.70 | −21.11 |
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