ABSTRACT
The aim of this paper is to present the structural health monitoring system in Eurasia Tunnel in Istanbul, Türkiye, which is a double deck highway tunnel of 5.4 km length connects Asia and Europe continents beneath sea floor in complex geological conditions. Since the tunnel is 17 km away from a major fault, a structural health monitoring system has also been established, which includes total of 36 sensors including accelerometers and laser displacement sensors. The system monitors impact of a potential earthquake on the tunnel, the traffic vibrations, the traffic load on different components as well as the seasonal change effects on the tunnel. For the sustainable operation of the road tunnel, an automatic decision support software is also developed for monitoring, alerting and reporting in extreme cases without the need of a human intervention. This paper further presents the mitigation measures in design & construction period for resilience, system integrations, procedures, business continuity plan, conducted drill exercises, recorded and evaluated earthquake impacts in the tunnel since the activation of structural health monitoring system in a systematic approach.
