Detailed information about temperature distribution can be important to understand structural behavior in fire. This study develops a method to image three-dimensional temperature distributions in steel–concrete composite slabs using distributed fiber optic sensors. The feasibility of the method is explored using six 1.2 m × 0.9 m steel–concrete composite slabs instrumented with distributed sensors and thermocouples subjected to fire for over 3 h. Dense point clouds of temperature in the slabs were measured using the distributed sensors. The results show that the distributed sensors operated at material temperatures up to 960◦C with acceptable accuracy for many structural fire applications. The measured non-uniform temperature distributions indicate a spatially distributed thermal response in steel–concrete composite slabs, which can only be adequately captured using approaches that provide a high density of through-depth data points.


Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

INSPIRE - University Transportation Center


This research was funded in part by the Stevens Institute of Technology, Missouri University of Science and Technology, and the National Institute of Standards and Technology (NIST) (grant number 70NANB13H183).

Keywords and Phrases

Composite structure; Distributed fiber optic sensors; Fiber optic sensors; Fire; High temperature; Temperature distribution

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Document Type

Article - Journal

Document Version

Final Version

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© 2020 The Authors, All rights reserved.

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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Publication Date

01 Oct 2020

PubMed ID