Structural fire safety of standart circular railroad tunnels under different soil conditions

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2008
Böncü, Altan
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In many tunnel designs, reinforced concrete tunnel lining design is selected based on construction requirements rather than design loads. A constant cross-section is typically used along a tunnel even if the design loads change from one location to another, especially for tunnels constructed by tunnel boring machines (TBM). Factor of safety against failure is not constant along the length of tunnel and is typically high at shallow depth regions. Factor of safety during a rare event is usually much less than the ones set for service load states. Rare events such as earthquake, train derailment, explosion and long duration fires do not happen daily and generally a minor reparable damage is targeted at the structure during those types of events. The focus of this study is to analytically investigate structural fire safety of reinforced concrete circular tunnel linings in terms of reduction in service load safety and to develop recommendations for preliminary assessment of structural fire endurance of circular tunnel linings. Analytical methods accounting for thermal non-linearity, material degradation, tunnel lining-ground interaction and fire time stages are available to assess the structural fire safety of the concrete tunnel linings. Analytical results are determined to be in good agreement with tunnel key segment hydrocarbon fire test.
Civil engineering.
http://etd.lib.metu.edu.tr/upload/12609537/index.pdf
https://hdl.handle.net/11511/18241
Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats
A. Böncü, “Structural fire safety of standart circular railroad tunnels under different soil conditions,” M.S. - Master of Science, Middle East Technical University, 2008.
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