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  Determination of Fire Load on Tunnel Lining under Event of Light Rail Vehicle Fire at Eglinton-Scarborough Crosstown Twin Tunnels Project

  This paper discusses the approach undertaken to determine design temperature of Precast Concrete Tunnel Lining (PCTL) under a major fire event. The tunnel is part of 11 km long bored twin tunnels for Eglinton-Scarborough Cross-town Twin Tunnels (ESC TT) project in Toronto. The fire loading was established through a study for Transit Expansion Department (TED). Computational Fluid Dynamics (CFD) was used to predict the growth of the fire within the tunnel under different ventilation scenarios. CFD analysis simulates initiation and growth of the fire within a train. The fire follows a medium fire growth rate until the fire heat release reaches the maximum fire load of 14.5 MW. At this stage, the fire blows out from the side windows of the car. The variation of the surface temperature was tracked and used as an input for the subsequent structural calculation of the PCTL.

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