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Bridge monitoring using embedded ultrasonics First results from the BLEIB reference structure
(2017)
The BLEIB reference structure The structure is a two-span, 24 m long inverse u-shaped post-tensioned concrete beam. Fibre optic sensing cables, RFID sensors and ultrasonic transducers are permanently embedded. Other sensing techniques (vibrational, optical, ultrasonic, mechanical) are applied externally. Tension can be adjusted. Loads can be placed at arbitrary locations. Limited damage is introduced to one span. The BLEIB reference structure is located at BAM‘s test site in Horstwalde, south of Berlin. Ultrasonic transducer before concreting.
Embedded ultrasonic transducers 14 piezo transducers have been embedded before concreting. They are located in five sections, two close to the centers of both spans respectively and one above the central bearing.
Load experiment and data evaluation In a first experiment load 2 (weight 2 t) was moved three times along the southern (right) span. The tension forces were modified as well.
Ultrasonic transmission measurements were repeated over time and evaluated using Coda Wave Interferomerry (CWI), which determines correlation coefficients and relative velocity changes as subtle indicators for loads and other changes in the material.