The Northern Elbe Bridge, built in 1963, is the eastern Hamburg Elbe crossing of the Federal Motorway 1 over the Norderelbe, which gives the bridge its name, and is located directly between the two motorway junctions Hamburg-Süd and Hamburg-Südost. After the first damage in the form of fatigue cracks occurred in the 2010s, recalculations and inspections were carried out. In the course of this, it was determined that a mathematical structural modelling that corresponds as closely as possible to reality is of great importance in order to be able to assess the damage that has occurred and reliably determine critical points in the structure. For this purpose a comparison between measurement and calculation of the structural deformations under defined loads offers a good possibility for verification and calibration of calculation models. In the present case the crossings of exceptional heavy transports with defined loads could be used. An innovative kinematic laser scanning was used for the metrological recording of the structural deformations. The principle procedure for the measurement data acquisition and the results of the comparison are described in this article.
Christian Hesse, Niklas Luka Krause, Matthias Frenz, Ingo Neumann, Frederic Hake, Jens-André Paffenholz