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.

FactorsCMSMCFDI

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 casesAble to locate damage with little ambiguityMultiple peaks indicating that damage is located near a certain supportMisleading predictions of damage location

Use of additional measurement pointsProportional increase in localization accuracyProportional increase in localization accuracyProportional increase in localization accuracy

Use of additional modesNo improvementReduction in ambiguity for some near support damage casesDecline in localization accuracy

Combined use of additional modes and additional measurement pointsNo improvementNo improvementSome improvement relative to the use of additional modes alone