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Rigid Bridges Health Dynamic Monitoring Using 100 Hz GPS Single-Frequency and Accelerometers

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Document pages: 17 pages

Abstract: Thisarticle presents the modal frequency recordings of a rigid bridge, monitored bythe GPS receivers (Global Positioning System) with a data recording rate of 100Hz and accelerometers. The GPS data processing was performed through the double-difference phase,using the adjusted interferometry technique (i.e. phase residue method—PRM&reg). In the method, the double-difference phaseof the carrier L1 is realized by usingtwo satellites only, one was positioned at the zenith of the structure and theother satellite was positioned near the horizon. The results of the parametricadjustment of the PRM observations were finalized through softwareInterferometry, mathematical algorithm were applied and compared with the accelerometer. The comparison served tovalidate the use of GPS as a fast and reliable instrument for the preliminarymonitoring of the dynamic behavior of the bridge, road artworks which arecommon in several countries, especially in the Brazilian road network. The data time series from the GPS andaccelerometers were processed using the Wavelet. The detection of frequenciesmeans that the combination of 100 Hz GPS receivers and the PRM allows detectingvibrations up to 5 mm. It presented significant results which were never obtainedby the Fourier Transform.

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