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Vibration Analysis at Overhead Direction Signs

A2 Southern motorway, Styria, Austria
Recording and assessment of the vibration behaviour of a gantry.

Objective of the analysis and the measurement was the recording and assessment of the vibration behaviour of a gantry.

In particular, the eigenfrequencies, the actual displacements and vibration frequencies as well as possible conclusions regarding events triggering vibrations should be determined. The background was that ASFINAG employees had observed and reported noticeable vibrations of the structure during inspections of this or similar gantries.

The measurement was carried out with vibration accelerometers and complemented with a video recording of the traffic at the same time. Based on the results of this short-time measurement an extended measurement concept shall be elaborated.

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