Abstract
Dynamic measurements of two steel truss bridges for Structural Health Monitoring (SHM) were performed. The investigated bridges were: a single supported one span truss bridge and a multi-span truss bridge. Two possibilities of measuring setup were considered. A simple arrangement made up of one polygon has been used for data acquisition of the single span truss bridge. A more complex measuring setup made up of two polygons with up to 32 channels has been used for the large bridge with an entire length reaching up to 500 m. A connection of both measuring polygons was achieved by Wi-Fi antennas. The reason why the multi-span truss bridge was chosen for SHM is that the construction is nowadays overloaded. The dynamic measurements were done, ambient and semi-ambient data were analysed. After that, some mode-shapes were identified from the acquired data and then the data were compared with numerical calculations. Finally, experiences and conclusions from the ambient data measurement are summarized.
Highlights
This paper is devoted to dynamic measurements of two steel bridges in Slovakia loaded by ambient vibrations
The acquired and processed data could be used for Structural Health Monitoring (SHM) purposes
The used measuring system proved that it is suitable for vibration measurements of small and large bridge structures as well
Summary
This paper is devoted to dynamic measurements of two steel bridges in Slovakia loaded by ambient vibrations. The construction of the bridge is overloaded because the designed capacity was originally 50 000 cars per day and the amount of passing vehicles has about doubled. This traffic increase can cause problems with the fatigue resistance of important structural details of the bridge structure. The collapse of bridge structures during operation, apart from risking many lives, may cause important economic losses. The dynamic measurements are a necessary part of SHM. AMBIENT VIBRATION MEASUREMENTS OF STEEL TRUSS BRIDGES.
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