Abstract
Structural monitoring of objects is primarily executed to assess external and internal effects on the object, in order to ensure the safety of people, animals, and material assets. Such monitoring can be executed through various methods, depending on the object, conditions for execution, and purpose of the monitoring. In this case, the focus is on the execution of the monitoring of Maribor footbridge, where the dynamic effects of the object are monitored. For this purpose, geophone, accelerometer, and geodetic methods—using Global Navigation Satellite System (GNSS) and Robotic Total Station (RTS) equipment—are used, of which one is controlled by the additional programme GeoComZG. The emphasis of our experiment is on the application of non-contact geodetic methods, with which the measurements of dynamic response are typically performed, as they enable measurements up to 30 and 100 Hz with RTS and GNSS, respectively. In this article, the application of various procedures of non-contact data capture on the footbridge are detailed and a comparison and analysis of the obtained values for monitoring the dynamic response of the structure are presented.
Highlights
Modern monitoring techniques for bridges are typically based on the measurement of the displacements and vibrations
The performance of the measurements in most scientific and engineering fields characterize the periodic signal of measured objects, where the periodicity is identified through spectral analysis
The main reason for the overall use of this method is mostly that, by Fourier transformation, complicated operations of disposition and convolution are converted into simple multiplicative operation and, as such, Fourier transformation is an important tool in solving differential equations
Summary
Modern monitoring techniques for bridges are typically based on the measurement of the displacements and vibrations. Data on the static and dynamic conduct of the structure under load are usually obtained from burdening tests. With the obtained data from the burdening tests and continued monitoring, data on the long-term conduct of the objects can be obtained. This is very important for highly loaded objects, such as those on highways or railways. The technological development of measuring equipment has intervened in the area of geodetic instruments; until a few years ago, it was only possible the determine the vertical and horizontal displacements and vibrations in the range of their natural frequencies.
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