Gota Bridge Monitoring

Emplacement

Gota Bridge Monitoring, Göteborg
Sweden

Integrity monitoring
DiTeSt SMARTape used for bridge monitoring
Self-monitoring
Warning messaging system
World premiere

Système: 
System DiTeSt / DiTemp
Domaine: 
Domain Bridges
Clients: 
NGI
Début des travaux: 
2005
Fin des travaux: 
2009
Installation: 
NGI / SMARTEC
Courte description: 
Götaälvbron, the bridge over Göta river, was built in thirties and is now more than sixty years old. The bridge is nearly 1000 meters long and consists of concrete slab supported on nine steel continuous girders supported on nearly 54 columns. During the last maintenance works, number of cracks were found in steel girders, notable in zones above columns where the important negative bending moments are present. Two issues are in cause of steel cracking: fatigue and mediocre quality of the steel. The bridge authorities decided to keep the bridge in service for the next fifteen years, but in order to increase the safety and reduce uncertainties related to the bridge performance an integrity monitoring system have been mandatory.
Objectifs de contrôle: 
The aims of the monitoring system have been to detect and localize new cracks that may occur due to fatigue and to detect unusual structural behaviors. The warining messages are automatically sent to responsible engineers via e-mail and SMS. The main issue related to selection of the monitoring system has been the total length of the girders which is for all the nine girders more than 9 km. It was therefore decided to monitor the most loaded five girders (total length of 5 km approximately) and logically a fiber optic distributed sensing system have been selected. For the first time a truly distributed fiber optic sensing system is employed on such large scale to monitor bridge integrity.
Nombre de capteurs: 
64
Résultats: 
Results are not disclosed.
View to steel girders
View to testing SMARTapes installed on a girder
Documents connexes: