German bridge examined by e.g. Hansen (case study)
Object description
A four-span post-tensioned concrete bridge was investigated for fatigue. One box-shaped girder serves each direction of travel. The closed box cross section prevents the equipment from vandalism.
Object analysis
An assessment of structure specific fatigue was carried out. Traffic axle loads and the resulting strains in the tendons were measured. The fatigue assessment was based on S-N-curves and the PM-rule for accumulation of damage.
Object state
Global deflection was measured at two locations of the bridge. Strain gauges and temperature sensors were installed at a number of locations, and axle loads were measured after calibration to known axle loads. A fatigue assessment was carried out for concrete, reinforcement and tendons.
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Documents
This case study was contributed by Frida Liljefors of Norwegian University Of Science And Technology. Last edited by technical staff.