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

Published: August 07, 2019


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
Pub Type: Conferences

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Steel-Concrete Composite Slabs, Brillouin optical time domain analysis, Fiber optic sensors, Temperature, Fire, Concrete
Created August 07, 2019, Updated September 04, 2019