This paper presents the main results from the TRB (Transportation Research Board of the US National Academies) Synthesis Study Project. The design fire parameters used for the design of tunnel emergency ventilation and fire life safety systems have a significant impactrnon the tunnel design and users’ safety. The key criteria are the fire growth/decay rate,rnsmoke production and peak fire size. The objectives of the study is to synthesize thernavailable information related to design fires in roadway tunnels, to identify gaps in thatrninformation and to provide a framework for design guidance. This study provides literaturernreview and synthesis analysis of the latest available information, practice and knowledgernrelated to design fires in road tunnels. Literature review is combined with survey results inrnorder to report on the state-of-the-practice and identify the gaps and needs of the tunnelrnowners. Responses were received from the US state Departments of Transportation (DOT),rnTunnel Operating Agencies in the US, Canada, Australia, Korea, Hungary and Sweden.rnThe Objectives of this study was to:rn? Collect and document significant fire incidents in road tunnels, data from firerntests in road tunnels and identify gaps in testing.rn? Document the effects of various ventilation conditions, tunnel geometry andrnstructuralon-structural components of the tunnel on design fire characteristics.rn? Collect and document data on the application and effectiveness of fixed firernsuppression systems and how these might modify the design fire size and gaps inrnavailable information.rn? Document the impact of alternate fuel vehicles on design fires.rn? Document the state of the practice in computer and scale-modeling efforts.rn? Document fire detection methods, exit strategies and motorist notificationrnsystems.rn? Document design guidance information on the issues that need to be consideredrnin setting design fire sizes and establishing next steps.rn? Identify best design practice and tunnel operating agency’s needs.
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