United States Department of Transportation
i
Sensor-Assisted Condition Evaluation of Steel and Prestressed Concrete Girder Bridges Subjected to Fire – Phase II
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2023-12-01
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[PDF-3.40 MB]
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Edition:Final Report January 1, 2019 – March 30, 2023
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Abstract:This report summarizes the results and findings of Mid-America Transportation Research Center (MATC) research project No. 57768. In this study, fire dynamics simulation (FDS) is conducted on a new Pyrosim software platform and validated experimentally to understand the surrounding air temperature and internal temperature of reinforced concrete (RC) beams under channel fires fueled by natural gas, which is released from four burners in a controllable fashion. For statistical analysis, four RC beams were designed, cast, and tested. Heat release rate (HRR) was measured and used as the fire load input to each test beam. The effects of mesh size, computational zone, side hole area, and burner surface temperature were investigated through parametric analysis. The predicted air temperatures from a FDS model compared well with the experimental results with a maximum difference of 20% for both maximum and average temperatures of the beams when loaded at a constant HRR. Even one-dimensional heat conduction in the FDS satisfactorily predicted the internal temperature of beams on the fire side and bounded the experimental temperatures after the predicted temperatures conducted from different surfaces were superposed. The effects of concrete specific heat, thermal conductivity, and wind gust were investigated numerically.
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