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Abstract
Building structures are subject to various deformations caused by external and internal factors. Deformations are determined by various methods in the form of monitoring. It is very important to monitor the dynamic vibration response on bridge structures since these measurements allow us to identify any possible damage over time and take appropriate action. Our experiment, described in this article, is based on the use of non-contact methods, among which we used a geodetic instrument RTS (Robotic Total Station) and a seismograph to measure vibrations. The purpose and novelty of our work are reflected in the use of geodetic instruments to determine the dynamic response and synchronization of the obtained results. When using RTS technology, we increased data acquisition from 9 to 26 measurements per second. Comparative analysis of the measured signals was performed using FFT (Fast Fourier Transformation) and LSP (Lomb–Scargle Periodogram), based on LSSA (Least-Squares Spectral Analysis). The results showed us that when using the RTS geodetic instrument, it is possible to achieve frequency spectra comparable to those measured with a seismograph instrument. By increasing the number of measurements, the RTS method can be used to obtain more continuous data, which are essential for dynamic analyses.
Highlights
Nowadays, the monitoring of bridging structures is mostly based on measuring the displacements, deformations, and vibrations of bridges
The comparison of frequency spectra obtained with the described measuring equipment confirms the consistency of the source signals and the matching of the frequency spectra
Based on the comparative analysis of individual measurements with RTS TS50 measuring and geodetic equipment and on the basis of the described available literature, we found that the highest accuracy of measurements was achieved at frequencies lower than 20 Hz
Summary
The monitoring of bridging structures is mostly based on measuring the displacements, deformations, and vibrations of bridges. Data on the static and dynamic behavior of a structure under load are usually obtained by a load test. Data on the longterm behavior of facilities are obtained by load testing and continued monitoring. This is important for heavily loaded objects on highways or railroads. The group of alternative methods includes geodetic (optical) measurements, which can be static or dynamic. With the development of geodetic equipment, increasing resolution, additional sensors for faster reading, and automatic prism monitoring, it is possible, when geodetic measurements are taken together with very accurate static measurements, to perform dynamic response measurements in various monitoring [1,2]. It should be noted that geodetic methods can be used in a very simple way to obtain quality data on the behavior of struction in locations where this would not be possible due to inaccessibility or difficulty with other methods
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