Akademik Veri Yönetim Sistemi
International Symposium on Applied Geoinformatics (ISAG2021), Riga, Letonya, 2 - 03 Aralık 2021, ss.1-6
In recent years, geodetic
methods have been preferred due to their high accuracy and ease of use in the
Health Monitoring Surveys. In this study, harmonic oscillation tests were
carried out on a single-axis shake table to examine the usability of the Single
Base and the Network RTK GNSS method in structural health monitoring studies.
The shake table was moved harmonically at different frequencies and amplitudes
to simulate possible structural movements and it is aimed to determine these
movements with the 20 Hz multi-GNSS equipment. The obtained data were evaluated
by time series analysis and fast Fourier transform techniques, and the
frequency and amplitude values of the movements were calculated. The accuracy
of the results was determined by comparing GNSS displacements with the results
obtained by LVDT (Linear Variable Differential Transformer) which is the
position sensor of the shake table. So the advantages of the two RTK methods
over each other were determined by comparing the amplitude and frequency differences.
In addition to comparing the methods with each other, the consistency of the
methods was checked by collecting data when the shake table was stationary. As
a result of all experiments, it was determined that the Single Base and the
Network RTK GNSS method can be used in observing the behavior and natural
frequencies of engineering structures with a precision of a few mm.