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Using GPS for monitoring tall‐building response to wind loading: filtering of abrupt changes and low‐frequency noise, variography and spectral analysis of displacements

Christopoulos Dionysios, Mertikas Stelios, I. Arhontakis, James M. W. Brownjohn

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Summary

We compare two methods for monitoring the dynamic response of tall buildings to wind loading, using data from a 280-m-highbuilding in Singapore. The first method is based on accelerometer measurements. The second method is based on the Global PositioningSystem (GPS) technology. The GPS can in principle detect absolute displacements with lower frequencies than the accelerometers,but the GPS positioning signal is usually very noisy. We propose a systematic procedure for modeling the stochastic and systematiccomponents of the GPS displacement time series and for extracting the weak structural response from the dominant noise. Thespectrum of the building response obtained from the filtered GPS data exhibits a dominant peak at 0.19Hz. The frequency ofthe peak coincides with that obtained from the analysis of the accelerometer data. The proposed analysis of the GPS signalprovides a method for cross-validating the GPS and accelerometer measurements, and shows that “educated” filtering of theGPS signal can reveal essential features of the building’s response to wind loading. Using GPS for monitoring tall-building response to wind loading: Filtering of abrupt changes and low-frequency noise, variography and spectral analysis of displacements. Available from: http://www.researchgate.net/publication/225424783_Using_GPS_for_monitoring_tall-building_response_to_wind_loading_Filtering_of_abrupt_changes_and_low-frequency_noise_variography_and_spectral_analysis_of_displacements [accessed Oct 19, 2015].

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