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Development and Application of IATS for Structural Health Monitoring

This paper describes the technological development of Image Assisted Total Stations (IATS) from early 2000s. The development enabled much wider integration of these types of geodetic instruments with their sensors for the purpose of structural health monitoring (SHM), i.e., for the displacement and deformation monitoring of structures. IATS can be used for periodic or continuous monitoring of structures, or during regular structure inspections. Also, they can be used for structural and geo-monitoring, i.e., for the determination of static and dynamic displacements and deformations, as well as for the determination of civil engineering structures’ natural frequencies. This way we can collect essential data about the current condition of structures. For this paper, we developed low-cost IATS prototype, which consists of an RTS Leica TPS1201 instrument and GoPro Hero5 camera. The application of IATS prototype is presented through experimental study that was performed for the purpose of later static and dynamic load testing of the bridges. The focus of the paper besides technological development of IATS is on the determination of simulated dynamic displacements and natural oscillation frequencies by the prototype. For the simulations, we used multi- purpose universal testing machine intended for static and dynamic testing of mechanical properties of building materials and construction in laboratory. The experiments will cover the dynamic displacements amplitudes of 0.2, 1.0 and 5.0 mm at the frequency of 1 Hz. The procedure of conducting measurements with IATS, as well as the analysis of acquired data and achieved results, is presented. From the performed experiments, we manage to successfully determine simulated natural frequency and all dynamic displacements at different amplitudes with high level of overlap, accuracy and precision.

IATS, SHM, displacement, natural frequency, accelerometer

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