United States Department of Transportation
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Condition Evaluation of Precast Post-Tensioned Concrete Girder Bridges During Fires from Distributed Fiber Optic Sensors
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2023-07-01
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[PDF-3.53 MB]
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Edition:Final Report January 1, 2021 - December 31, 2023
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Abstract:This report summarizes the results and findings of Mid-America Transportation Research Center (MATC) research project No. 65575. It is focused on the measurement of strain and temperature in concrete and prestressed structures at ambient or high temperature using a pulse pre-pump Brillouin optical time domain analysis (PPP-BOTDA) technique. The main objectives of this study are: (a) to experimentally characterize the effects of multilayered coatings on the performance of distributed fiber optic sensors (DFOS) when the coatings experience softening and melting at high temperatures; (b) to develop a spiral deployment scheme of DFOS and monitor/assess the post-tensioned force in 7-wire twisted steel cables based on PPP-BOTDA. The Y-DFOS was found to no longer be strain-free at high temperatures since the softened sheath, aramid yarns, buffer, and polymer coatings became viscous and adhered to the surrounding mortar above softening temperatures, i.e., 263-320 ℃. Both the B-DFOS and W-DFOS captured uneven strain distributions along the mortar specimen due to nonuniform temperature distribution, mortar heterogeneity, and strain transfer efficiency. The maximum, minimum, and average cable forces integrated from the measured strain data were compared and validated with those from a load cell. The maximum (or average) cable force was linearly related to the ground truth data with a less than 10% error between them after any initial slack had been removed from the test setup. The post-tensioned force loss was bounded by approximately 30% using the test setup designed in this study.
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