ABSTRACT
The weather conditions and the loading during operation cause changes in the spatial position and in the shape of bridge structures that affect static and dynamic function and reliability of these structures. Due to these facts, geodetic monitoring is integral part of bridges’ diagnosis and gives important information about the current state (condition) of the structure.
To obtain complex information about the behavior of bridge structures is recommended to perform not only static deformation monitoring using conventional surveying techniques, but also dynamic deformation measurement of the monitored structure using non-conventional surveying methods.
The paper presents multi-sensor monitoring of the Liberty Bridge (Bratislava, Slovakia).
The bridge is part of a cycling route between the Bratislava city district Devinska Nova Ves (Slovakia) and Schlosshof (Austria). The structure is built over an inundation area on both sides in a protected floodplain forest. The total length of the bridge structure is 525.0 m. The main structure consists of a steel structure with a triangular truss beam suspended over the river Morava and inundation bridges on both sides of the river. The measurements were focused on determination of displacements of the suspended bridge, which consists of 3 sections with spans of 30.0 m + 120.0 m + 30.0 m = 180.0 m over the river Morava.
The paper describes the experimental deformation monitoring of the bridge performed using TLS, ground-based radar interferometry and accelerometers. The procedure of the measurement, the data processing and the results of the deformation monitoring are described.
