• measurement of the dynamic displacements and of the modal frequencies of a short-span pedestrian bridge using gps and an accelerometer

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 632
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     signal analysis techniques (supervised-type learning filter in combination with a chebyshev filter) constrained and tested by independent accelerometer data were used to process noisy gps measurements of oscillations of 40 m long steel footbridge excited by coordinated jumps of a group of people. this approach permitted to de-noise the geodetic displacement record and reconstruct a minimum bias waveform for the dynamic displacement of this stiff bridge (4.3 hz modal frequency, ∼6 mm oscillation amplitude). this result indicates that properly processed high-frequency satellite geodetic data may be used to measure dynamic displacements not only of high-rise buildings, cable-stayed bridges and other flexible structures, but of stiff civil engineering structures as well and may be useful for the structural health monitoring, analysis and design of a large range of engineering structures. it was also found that although currently used 10 hz sampling rate gps receivers may underestimate certain high-frequency peak displacements, this will not be a problem for the recently introduced 50–100 hz receivers.

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