ABSTRACT
Steel corrosion is a dominant source for the deterioration of reinforced concrete (RC) structures, which is always spatially nonuniform and discretely distributed in the RC components. Owing to the statically indeterminate features of tunnel structures, both the mechanical responses (e.g., bending moment and axial force) and the ultimate bearing capacity of segmental linings will be affected substantially with the increase in steel corrosion. In this paper, a probabilistic model for simulating the spatial variation of steel corrosion is proposed in conjunction with a random field and the effect of sustained load. An approach for estimating the residual M-N capacity (i.e., residual bending moment and corresponding axial force) of corroded segment section is introduced. Monte Carlo simulation (MCS) incorporated with finite difference method (FDM) is performed to investigate the failure probability of corroded RC shield tunnels. Dangerous segmental lining sections of shield tunnels with the evolution of steel corrosion deterioration are revealed based on an illustrative example.
