Research Article
Structural Health Monitoring of Precast Concrete Box Girders Using Selected Vibration-Based Damage Detection Methods
Table 6
Summary of performance of the three VBDD methods and the influence of the factors studied.
| Factors | CMS | MCF | DI |
| Reference conditions: (i) 7 meas. points (ii) Fundamental mode | Unambiguous indication of damage location within ±0.8h | Unambiguous indication of damage location within ±0.8 | Unambiguous indication of damage location within ±0.8 |
| Near support damage cases | Able to locate damage with little ambiguity | Multiple peaks indicating that damage is located near a certain support | Misleading predictions of damage location |
| Use of additional measurement points | Proportional increase in localization accuracy | Proportional increase in localization accuracy | Proportional increase in localization accuracy |
| Use of additional modes | No improvement | Reduction in ambiguity for some near support damage cases | Decline in localization accuracy |
| Combined use of additional modes and additional measurement points | No improvement | No improvement | Some improvement relative to the use of additional modes alone |
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