ABSTRACT
In recent years, the use of precast steel fiber reinforced concrete (SFRC) segments in tunnel linings has seen a significant increase due to their notable advantages in production speed and environmental sustainability. This paper presents a comprehensive fire analysis of steel fiber reinforced segmental lining using an internally calibrated Finite Element Method (FEM) approach. The study focuses on evaluating the thermal and struc-tural performance of segmental linings under fire conditions, providing insights into the behaviour of SFRC when exposed to high temperatures. The operational procedure for the proposed FEM approach will be explained in detail, with a specific focus on defining the constitutive law under high-temperature conditions, as well as the creation of the model itself. This detailed methodology ensures that the approach can be reproduced using any software capable of capturing the nonlinear behaviour of the material, offering valuable guidelines for the design and implementation of fire-resistant segmental linings in tunnel construction.
