Bragg grating based multi-sensor system for structural integrity monitoring of a large civil engineering structure: a road bridge in Norway

摘要

A spatially multiplexed high bandwidth WDM based fibre Bragg grating sensor system has been developed for structural condition monitoring and health maintenance of large civil engineering structures under both static and dynamic loading conditions. The system has been field deployed for real-time strain monitoring on a new 346m long steel road bridge in Norway. The bridge was instrumented with both fibre Bragg grating sensors and conventional resistive strain gauges at various points optimally identified. In this paper laboratory results from small-scale structures as well as field results on the real bridge structure are reported.