NDLI: Evaluation of Standard and Real Fire Exposures to Predict the Temperature Response of a Railcar Floor Assembly

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Evaluation of Standard and Real Fire Exposures to Predict the Temperature Response of a Railcar Floor Assembly

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Kapahi, Anil Mckinnon, Mark Rippe, Christian Lattimer, Brian
Copyright Year	2018
Abstract	Current standards such as NFPA 130 [1] require railcar floor assemblies to achieve a fire resistance rating according to ASTM E119 [2] by exposing the assemblies to a prescribed 30 minute time-temperature curve using a furnace. Though the ASTM E119 is a standard test procedure, it does not represent a real fire scenario which can have temporal and spatial varying exposure. This work developed a computational framework to evaluate and compare standard fire exposures such as ASTM E119 to real fire exposures to determine the difference in the temperature rise of a railcar floor assembly. The dimensions of the assembly used in this work consisted of the entire width of the railcar ∼3.0 m (10 ft) and a length of 3.7 m (12 ft) as described in NFPA 130. The real fire exposures simulated in this work have been identified in a review [3] of incidents involving fire exposures to railcars in the US and internationally over the past 50 years. The fire exposures consisted of a continuously fed diesel fuel spill, a localized trash fire, and a gasoline spill simulated from a collision of the railcar with an automobile. These realistic fire exposures were applied to a floor assembly model in Fire Dynamics Simulator (FDS) [4] which also included the undercarriage equipment to better capture the fire dynamics. The thermal exposure at the underside of railcar assembly was extracted using the heat transfer coefficient and the adiabatic surface temperature provided by FDS. These spatial-temporal exposures were coupled with a detailed railcar floor assembly finite element (FE) model in ABAQUS [5] to analyze the thermal behavior of the assembly. The thermal model in ABAQUS provided the evolution of temperature in different components of floor assembly consisting of a structural frame, insulation, and a composite floor. The standard scenarios were simulated for two hours instead of the typical 30 minutes to identify the appropriate exposure duration which can better represent a real fire scenario.
Sponsorship	Rail Transportation Division
File Format	PDF
ISBN	9780791850978
DOI	10.1115/JRC2018-6240
Conference Proceedings	2018 Joint Rail Conference
Language	English
Publisher Date	2018-04-18
Publisher Place	Pittsburgh, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Insulation Temperature Solid wastes Dimensions Automobiles Astm international Fire resistance Structural frames Collisions (physics) Composite materials Furnaces Municipal solid wastes Dynamics (mechanics) Gasoline Fire Diesel Manufacturing Finite element analysis Heat transfer coefficients
Content Type	Text
Resource Type	Article

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