The Rio-Antirrio Bridge in Greece is an exceptionally impressive structure built to endure extreme environmental conditions. Seismic and meteorological risks to its structural integrity must be continually monitored. Its operating concession holder Gefyra has entrusted Sixense with this task for more than 16 years.
From the construction phase onwards, the operating concession holder has needed to monitor the response of the bridge structure to its environment, and validate the assumptions made at the design stage. The ongoing monitoring of the aging structure enables decisions regarding whether the bridge can be reopened or requires maintenance closures following periods of extremely high winds or seismic events.
The Rio-Antirrio Bridge: a structure under the microscope
EverSense ®, our Structural Health Monitoring System (SHM), was designed and implemented by our teams at the time of construction. Since it opened to traffic in 2004, the 1,000 data acquisition channels of this system have enabled Gefyra to record and characterize the behaviour of the structure and to detect changes in this behaviour, especially after exceptional events such as earthquakes or unusually high winds.
The monitoring system has been regularly maintained and upgraded since implementation. It now incorporates functions that enable real-time traffic management during seismic events or exceptionally high winds.
The EverSense system has made it possible to validate structural design data and coupled with the quality of data generated, has made it possible to allow traffic back safely onto the bridge promptly over 16 years of major environmental events.
The real-time monitoring system implemented by Sixense meant that we could analyse the huge amount of data needed to establish an overview of the structure and receive automated alerts immediately after the earthquake struck. The great advantage of the Sixense system is that it allows us to achieve significant improvements in safety, which is the most important thing from our perspective
Aris Stathopoulos, Structural Maintenance Manager at Gefyra SA/ VINCI Concessions for the Rio-Antirrio Bridge in Greece