ABSTRACT
This paper presents comparative analyses of the performance of concrete structural lining for tunnels during fire event using the 500°C isotherm method outlined in BS EN 1992-1-2:2004 Annex B. The analyses investigated the impact of different concrete thermal properties on the obtained time vs temperature curves, contrasting them with results from fire tests in panels. It also analyzed the impact of using different fire curves on temperature evolution at different lining depths, the influence of different fire exposure conditions on temperatures and the impact of the fire exposure on capacity curves for sections with different reinforcement rates. The analyses revealed valuable insights that can inform future designs and be used as basis for further investigations.
