Probabilistic approach to damage of tunnel lining due to fire

Building up Efficient and Sustainable Transport Infrastructure 2017

Šejnoha, Jií^1 ; Sýkora, Jan^1 ; Novotná, Eva^1 ; Šejnoha, Michal^1

CTU in Prague, Thákurova 7, Prague

160 00, Czech Republic^1

关键词: Concrete samples;    Heat Release Rate (HRR);    Macroscopic tests;    Parameters characterizing;    Probabilistic approaches;    Temperature level;    Traffic densities;    Transport process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/236/1/012079/pdf
DOI  :  10.1088/1757-899X/236/1/012079

来源: IOP

【 摘 要 】

In this paper, risk is perceived as the probable damage caused by a fire in the tunnel lining. In its first part the traffic flow is described as a Markov chain of joint states consisting of a combination of trucks/buses (TB) and personal cars (PC) from adjoining lanes. The heat release rate is then taken for a measure of the fire power. The intensity λfreflecting the frequency of fires was assessed based on extensive studies carried out in Austria [1] and Italy [2, 3]. The traffic density AADT, the length of the tunnel L, the percentage of TBs, and the number of lanes are the remaining parameters characterizing the traffic flow. In the second part, a special combination of models originally proposed by Baant and Thonguthai [4], and Künzel & Kiessl [5] for the description of transport processes in concrete at very high temperatures creates a basis for the prediction of the thickness of the spalling zone and the volume of concrete degraded by temperatures that exceed a certain temperature level. The model was validated against a macroscopic test on concrete samples placed into the furnace.