Research Article

Structural Health Monitoring of Precast Concrete Box Girders Using Selected Vibration-Based Damage Detection Methods

Table 5

Error in predicted damage location by each method, listed as a fraction of measurement point spacing, when two and three modes were used in combination with 15 measurement points.

Method2 modes3 modes
Max. errorAvg. errorStand. dev.% ambig*Max. errorAvg. errorStand. dev.% ambig*

CMS0.500.140.092.50.500.140.090
DI0.700.280.172.50.500.250.152.5
MCF0.700.200.1527.50.500.190.1315

*indicates the percentage of the 40 cases that produced a second peak that was either at least 75% of the magnitude of the highest peak, or nearer to the damage location, including near support damage cases.