Geodetic Contribution to Structural Health Monitoring
experimental apparatus producing oscillations with pre-defined amplitude and frequency
Harmonic oscillations recorded by GPS and corresponding spectra.
Computed peaks are very close to the real oscillation frequency, 0.5Hz
GPS and RTS reflectors recording deflections of the deck of the historical Gorgopotamos bridge (Lamia, Greece) during passage of trains
Excitation of a stiff pedestrian bridge in Athens, Greece with coordinated jumps. Deflections were measured by different sensors, GNSS, robotic theodolites and accelerometers
GNSS, RTS reflectors and accelerometers recording the deflections of the deck of the Evripos bridge in Halkida, Greece
In the last years our research is focusing on
- the assessment of the potential of GNSS and RTS, assisted by accelerometers, to measure oscillations of various Engineering Structures, mostly using supervised-learning tecniques (experiments and data analysis).
- the expansion of the range of geodetic measurements to stiff structures
(modal frequencies > 1Hz and sub-centimeter deflections)
- development of various techniques and algorithms for the spectral analysis and filtering of geodetic time series.
- measurement of lateral oscillations of bridges
- identification and measurement of variations of dynamic characteristics of structures due to aging/decay.
- Measurement and analysis of wind-induced oscillations of various structures (cables, pylons etc).
Laboratory of Geodesy
and Geodetic Applications