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Measuring Temperature Distribution in Steel-Concrete Composite Slabs Subjected to Fire Using Brillouin Scattering Based Distributed Fiber Optic Sensors



Yi Bao, Matthew S. Hoehler, Christopher M. Smith, Matthew F. Bundy, Genda Chen


This study investigates temperature distributions in steel-concrete composite slabs subjected to fire using distributed fiber optic sensors. Several 1.2 m x 0.9 m composite slabs instrumented with telecommunication-grade single-mode fused silica fibers were fabricated and subjected to fire for over 3 hours. Temperatures were measured at centimeter-scale spatial resolution by means of pulse pre-pumped Brillouin optical time domain analysis. The distributed fiber optic sensors operated at material temperatures higher than 900 C with adequate sensitivity and accuracy to allow structural performance assessment, demonstrating their effective use in structural fire applications. The measured temperature distributions indicate a spatially-varying, fire-induced thermal response in steel-concrete composite slab, which can only be adequately captured using approaches that provide high data point density.
Proceedings Title
9th International Conference on Structural Health Monitoring of Intelligent Infrastructure
Conference Dates
August 4-7, 2019
Conference Location
St. Louis, MO


Steel-Concrete Composite Slabs, Brillouin optical time domain analysis, Fiber optic sensors, Temperature, Fire, Concrete
Created August 7, 2019, Updated September 4, 2019