Behavior of reinforced concrete and steel fiber reinforced concrete shield TBM tunnel linings exposed to high temperatures

► RC and SFRC shield TBM tunnel linings were tested under a HC fire load. ► Initial loads greatly affect the behavior of the lining segments. ► Coupled thermal-mechanical effects cause notable internal force redistribution in lining rings. ► Lining joints play a critical role in the performance of shield TBM tunnel linings.