PSI - Issue 84

Mario Costantini et al. / Procedia Structural Integrity 84 (2026) 859–866

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Fig. 2. (a) Side view of the South Portland Street Suspension Bridge, Glasgow, UK (Coordinates: 55.854984°N, 4.255561°W), (b) the location of the five sensors installed on the bridge; and (c) the sensors Spectra Matrix. Courtesy of University of Strathclyde, Glasgow, UK.

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Fig. 3. SPOT (a–c) [from Lotti et al., (2026)] and DPC (d–g) results for the South Portland Street Suspension Bridge (Glasgow) using UMBRA-5 data from May 20 and 16, 2024, respectively. (a–c) SPOT LOS velocity and spectra vs. ground truth for three pixels, including error metrics. (d– g) DPC results: (d) DPC coherence; (e) dominant frequency; (f) vibration amplitude; and (g) amplitude map detail suggesting that the extremities and midpoint remain near stationary, while the regions in between oscillate sinusoidally.