Abstract
In order to study the longitudinal seismic capacity of shield tunnels, this work applies the structural seismic vulnerability analysis, based on incremental dynamic analysis (IDA), to a shield tunnel and explores the ground motion intensity measure suitable for the shield tunnel in different site types. The failure probability of the structure at each earthquake intensity is calculated by combining the probabilistic seismic demand model with the limits on the engineering demand parameters to establish the seismic vulnerability curve of the structure. The results indicate that the peak ground velocity (PGV) is the ground motion intensity measure suitable for the longitudinal seismic performance of the shield tunnel. The site type has the most profound influence on the extent of the longitudinal damage to the shield tunnel, and site type IV is the most dangerous under an earthquake. Further, the tunnel has stronger seismic resistance in the elastoplastic stage. The low-grade bolts between the rings damage more severely than the high-grade bolts. A tunnel with either a great depth of burial or a large cross section is more dangerous than the one with either a small depth of burial or a small cross section. The risk of the axial tension-compression failure of the shield tunnel is higher than that of the horizontal transverse shear failure.
Highlights
Tunnels are an essential component of urban lifeline engineering and public social infrastructure and the traffic lifeline of modern metropolises
Considering a typical shield tunnel as an engineering case, we extend the structural seismic vulnerability evaluation based on the incremental dynamic analysis (IDA) to the longitudinal seismic performance evaluation of shield tunnels
A shield tunnel is selected as the analysis object, and a large number of numerical simulations are performed using the IDA based on the longitudinal response displacement method
Summary
Tunnels are an essential component of urban lifeline engineering and public social infrastructure and the traffic lifeline of modern metropolises. Their seismic safety and risk analysis have become an essential research topic on urban disaster prevention and reduction. For the study of the fragility curve, the methods of earthquake damage investigation and expert evaluation are primarily used in the early stages to establish the empirical vulnerability curve through statistical regression. Some researchers utilized numerical simulation to analyze the structural response statistically and used damage indicators to establish analysis curves with clear probability significance (He et al, 2017). In another work, Hwang and Liu (2004) used the pushover method to analyze the vulnerability of a highway system affected by an earthquake in the eastern United States
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