Photographic documentation of crack development on the openLAB during the loading test on 2025-05-06

Abstract

Between 2025-05-05 and 2025-05-07, extensive experiments were carried out on the openLAB research bridge. The test program was structured as follows:

Day 1 (2025-05-05): Static and dynamic measurements in the reference state Day 2 (2025-05-06): Loading of the bridge with hydraulic jacks up to the ultimate limit state Day 3 (2025-05-07): Local damage to the prestressing tendons (cutting wires at several locations)

This dataset contains pictures of cracks in the precast element (PE) 2.1 during the load test conducted on day 2. The load was applied locally to the prestressed element (PE) 2.1 (span 2, PE axis 1) using two hydraulic jacks and increased in steps up to a total of 400 kN. The pictures were taken using a Dino-Lite AM4113T digital microscope connected to a laptop running the DinoCapture 2.0 software. One set of pictures was taken for each load step, before applying the load and during the plateau of constant deflection (5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm).