engleski

Fire resistant secondary tunnel lining: results of thermal analysis and experimental study

There is an increased public interest in the safety of tunnels in recent years, due to catastrophes which happened in European tunnels. The attitudes towards fire protection systems in the tunnels have radically changed and new demands on structural fire protection are set up. Within the scope and research work of Eureka project E!2823 a new system for secondary tunnel lining was developed. In this paper the results of research work on composite fire resistant tunnel segments are presented. The aim of this research was to design the multifunctional composite as a part of tunnel structure and to obtain the mix design of each layer within the segment with demanded properties. The proposed composite fire resistant tunnel segments were tested on fire loads according to TNO test (''Rijkswaterstaat'' curve). The fire testing was performed on different combinations of composite materials, and one combination had shown excellent fire-resistance performance. Tunnel structural members were also numerically modelled in order to get the results from thermal analysis and to compare them with the experimental study. Computer model TASEF was used for solving heat transfer differential equation, in which thermal material properties were incorporated. The thermal material properties were defined for all components of the tunnel segments and time– dependent fire curve for the tunnel fire scenario was specified. The results from numerical analysis and from exeprimental study are compared and the evaluation of this model is given in the paper.

fire testing; fire protection; prefabricated tunnel segments; thermal analysis; numerical modelling

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