FIRE ANALYSIS OF REINFORCED CONCRETE PRECAST TUNNEL LINING CONSIDERING THE SPALLING EFFECT

Analysis aiming to predict the behaviour of segmental lining tunnels involve several aspect with high level of complexity. Since the thermal dilatation of the lining is resisted by the soil confinement, it become very important to predict not only the bearing capacity but also the stiffness of the structure during the fire exposure. On this point of view, possible spalling phenomena have to be considered in the analyses. The paper presents the results of non linear numerical analyses on a precast segmental lining tunnel considering the presence of spalling.