United States Department of Transportation
i
Sensor-Assisted Condition Evaluation of Steel and Prestressed Concrete Girder Bridges Subjected to Fire – Phase I
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2020-12-01
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[PDF-4.38 MB]
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Edition:Final Report August 1, 2017 - December 31, 2020
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Abstract:This report summarizes the results and findings of Mid-America Transportation Research Center (MATC) research project No. 59709. It is focused on the measurement of strain and temperature in concrete structures during or after exposure to high temperatures using pulse pre-pump Brillouin optical time domain analysis (PPP-BOTDA). The main objectives of this study are: (a) to study the strain transfer in concrete after exposure to high temperatures using PPP-BOTDA based fiber optic sensors; (b) to apply distributed fiber optic sensing (DFOS) technology based on PPP-BOTDA in large-scale concrete slabs. Dog-bone shaped ultra-high performance mortar was fabricated with DFOS embedded. They were subjected to different high temperatures and then natural cooling. After that, they were tested under tension. PPP-BOTDA based strain results compared well with the strain gauge data. This test demonstrates the effectiveness of strain transfer between the fiber optic sensors and concrete after exposure to high temperatures due to the occurrence of melting residues which provide friction between them. Several large-scale composite floor beams were fabricated and tested under mechanical or combined mechanical and fire conditions. The concrete slabs were instrumented with DFOS technology in an attempt to measure temperature distribution. Comparisons with co-located thermocouples show that while the increased spatial resolution provides new insights about temperature phenomena, challenges for local temperature measurements were encountered during this first attempt at application to large-scale specimens.
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