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Abstract: 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...