PSI - Issue 64

Robby Weiser et al. / Procedia Structural Integrity 64 (2024) 492–499 Robby Weiser / Structural Integrity Procedia 00 (2019) 000 – 000

494

3

distance traffic. In addition to the two groups, Group 0 is introduced for cars which are not covered by the recalculation guideline. The measurement data is shown below and the eight vehicle classes are presented. 2.2. Monitoring and data acquisition The existing structure of the A40 Rhine bridge in Duisburg-Neuenkamp in Germany is analyzed for the measurement data evaluation. The Rhine bridge is a representative bridge structure from the 1970s, which requires long-term maintenance due to a large number of damage patterns, Paschen et al. (2017a, 2017b). A representative crack in the cross-girder web in the immediate vicinity of the cover plate of the bridge box cross-section was selected as the investigated damage detail. The highly loaded T-joint detail is located directly under the truck lane of the two cell box cross-section with orthotropic deck slab. The box cross-section of the bridge is shown in Figure 1 and the damage detail in Figure 2.

Figure 1. Box cross-section of the Rhine bridge Duisburg-Neuenkamp.

Figure 2. Position of the examined crack on the box cross-section.

The gap opening measurements were carried out using clip-on extensometers (MTS, model 632-02F-20) fixed to magnetic adapters, which recorded the gap openings equivalent to the fracture-mechanical crack opening Mode I, which was determined to be decisive in advance of the measurements. The measurement campaign lasted 18 days with continuous measurement of the gap opening at a measurement rate of 200 Hz. For more detailed information on the structure of the monitoring system, see Begemann et al. (2024). Figure 3 shows an example of a one-minute section of the gap openings that occur.