n cooperation with the University of Luxembourg, a component test is carried out on an original bridge section. A 26-meter-long section of a prestressed concrete bridge will be subjected to defined damage in order to gain further insights into the component behavior during the fracture of stress members due to stress corrosion cracking. The aim of the long-term test is, in addition to gaining knowledge about the displacement of the apex in the bending line, also to identify the damage position on the structural member.
In previous component tests, it was demonstrated that damage to the structure can be detected at an early stage via the bending line or the recovery behavior.
It was shown that structural damage can only be detected by vibration measurements if the superstructure is excited in a defined way. Excitation from live loads is not sufficient for damage detection in early and middle stages.
View of the test specimen with load carriage and shaker:
The adjacent figure shows the exposed tendons, which are cut one after the other. After each further damage, the component is statically and dynamically loaded. The decisive measured variable is the bending line, which is recorded with high precision at several measuring points.
We would be pleased to inform you about the state of research.