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    Investigating the ability of high-rate GNSS-PPP for determining the vibration modes of engineering structures: small scale model experiment

    Access Status
    Fulltext not available
    Authors
    Yigit, Cemal
    Dindar, A.
    El-Mowafy, Ahmed
    Bezcioglu, M.
    Gikas, V.
    Date
    2019
    Type
    Conference Paper
    
    Metadata
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    Citation
    Yigit, C. and Dindar, A. and El-Mowafy, A. and Bezcioglu, M. and Gikas, V. 2019. Investigating the ability of high-rate GNSS-PPP for determining the vibration modes of engineering structures: small scale model experiment, in Proceedings of the 4th Joint International Symposium on Deformation Monitoring (JISDM), May 15-17 2019, Athens, Greece: Eugenides Foundation.
    Source Title
    https://jisdm2019.org/wp-content/uploads/2019/05/JISDM2019-Proceedings.pdf
    Source Conference
    4th Joint International Symposium on Deformation Monitoring (JISDM)
    Additional URLs
    https://jisdm2019.org/wp-content/uploads/2019/05/10.pdf
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/75892
    Collection
    • Curtin Research Publications
    Abstract

    This study evaluates the performance of the Precise Point Positioning method using Global Navigation Satellite System measurements (GNSS-PPP) for monitoring vibration modes of shear type buildings excited by harmonic ground motions and hammer tests. For experimental testing, the shear type lumped-mass building system is represented by a specially designed metal frame model, resembling a three story building, which was excited on a small scale shaking table. The excitation protocols applied were harmonic motions with different frequencies and amplitudes. The metal model has special deformation plates at the column tips to prevent the nonlinear rotations and out-of-plane motions for the entire system. The fundamental vibration periods of the model structure were computed by a Finite Element Mathematical (FEM) model, which were compared with the position variations determined by GNSS-PPP. Two GNSS receivers were mounted on top of the model structure on the line perpendicular to the motion axis to measure the rotation motion. The GNSS data comprised dual-frequency observations with a 10 Hz sampling rate. GNSS-derived positioning was obtained by processing the data using a post-mission kinematic PPP method with fixed phase ambiguities. Analysis of the characteristics of the vibration frequencies showed that the high-rate GNSS PPP method can capture the frequencies of first motion mode of shear type structural response when compared with the FEM output. Results demonstrate the efficiency of the high-rate GNSS PPP method in monitoring first motion mode of a natural frequency.

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