Consideration of the Effects of Air Temperature on Structural Health Monitoring through Traffic Light-Based Decision-Making Tools

Figure 5

(a) Frequencies observed at OT (thick black line) and expected range of variation (thin black lines) computed as the mean value ±2σ, between 1 March and 3 July 2012. (b) Prediction errors computed with (1) (scatter) and compared with the upper and lower thresholds (ε  = 2σ) (dashed lines).