The St. Marx Bridge in Vienna, Austria, built from 1973 to 1978, is located between the Danube-Canal and the Traffic Node Landstrasse. The bridge is counted among one of the most frequented partitions of the A23-South-East-Highway. The total traffic volume averages about 240,000 motor vehicles per day, whereas an increase of the ratio of heavy loads is detected as well. This leads to an enormous loading of the bridge structure. As a consequence thereof the serviceability of the expansion joints and the bridge bearings is affected. Thus, in order to detect the passing heavy loads, which cause damage, a structural health-monitoring system in combination with a video control system have been installed in 1998. Furthermore, the remaining structural service life can be predicted as well.

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