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Latest developments of structural fire protection for German road tunnels



Title: Latest developments of structural fire protection for German road tunnels
Author(s): J. Blosfeld and I. Kaundinya
Paper category : conference
Book title: 2nd International RILEM Workshop on Concrete Spalling due to Fire Exposure
Editor(s): E.A.B. Koenders and F. Dehn
ISBN: 978-2-35158-118-6
e-ISBN: 978-2-35158-119-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 247 - 254
Total Pages: 8
Nb references: 7
Language: English


Abstract: Experiences from real fires in road tunnels and fire tests in tunnels resulted in a review of the regulations for structural fire protection of German road tunnels. The paper reports about the procedure of the review and the results of the accompanying research projects. During this process the question ocurred how a longer fire duration and a higher fire temperature affect the heat diffusion of the tunnel lining and the load-bearing capacity of typical tunnel cross-sections. It could be shown by numerical analysis that the tunnel lining is more stressed by longer fire duration than by higher temperature. Furthermore, it could be shown in numerical analysis that typical German tunnel cross-sections could also resist fires which exceed the current requirements. As deeper concrete spalling may lead to an early exhaustion of the calculated load-bearing capacity, fire tests were conducted on large scale specimens.
The fire tests showed that the addition of synthetic fibres to the concrete for the tunnel lining can constitute an effective measure for the reduction of concrete spalling, also considering national conditions. For this reason, fibre modified concrete is to be tested in two German road tunnels.


Online publication: 2012-01-17
Publication type : full_text
Public price (Euros): 0.00