Research and development structure monitoring

2020 – Component trial on stress corrosion cracking (SCC

A component test is currently being conducted on an original bridge section in collaboration with the University of Luxembourg. Here a 26 metre long section from a prestressed concrete bridge is damaged under controlled (defined) conditions, in order to gain further insights on the component behaviour when tensional components break due to stress corrosion. The goal of the long-term test is to identify the position of the damage on the component and the displacement of the vertex in the bending curve.

 

In previous component tests it was already proven that the bending curve (by considering the ductility performance) can be drawn on to identify damage to the structure before first cracks become visible in the concrete.

 

 

View of the test body with load carriage and shaker:

 

Bauteiltest Spannungsrisskorrosion SpRK BMG Bauwerk Monitoring GmbH

The following image shows the exposed tendons that are individually severed one after the other. The component is subjected to static and dynamic load conditions after each further damage case. The decisive measuring value is the bending curve that is recorded at various measuring points.

 

 

We will gladly inform you about the status of the research.

 

 

Proof of Concept for a steel bridge, Hamburg 2018

 

In cooperation with the Technischen Universität Hamburg (TUHH) [Engineering School] dynamic deformation measurements were conducted on a bridge during normal operations and during runs under load conditions for the first time.  

 

The bridge is a 320m long motorway bridge in riveted steel construction method, year of construction 1912.

The bridge was equipped with eight laser measuring sections with measuring ranges from 50 to 125m. The air temperature and the temperatures on the carriageway and the supporting structure were also recorded.  A weight-In-motion system was installed on the bridge itself. This made it possible to validate the deformations by determining the vehicle masses.

 

 

View of the test bridge:

Bauwerksmonitoring

 

The result: Further stability reserves for the recalculation could be verified, by means of the experimental proof of stability per run under load.