ABSTRACT
This study aims to identify optimal intensity measures (IMs) for use in probabilistic seismic demand models (PSDMs) for rectangular tunnels in three soil deposits. To this end, we performed an extended numerical parametricstudy involving two-dimensional time history analyses of selected soil-tunnel configurations to evaluate the response of the selected tunnels under transverse seismic shaking. A series of 23 IMs were selected and tested from motions at tunnel level deoth. The selected IMs were tested on several metrics, such as correlation, efficiency, practicality, and proficiency, based on an extended number of regression analyses between the IMs and the damage measure (DM), for the studied tunnels. The results indicate that the velocity spectrum intensity (VSI) at the ground tunnel level depth can be considered as the optimal IM, whereas the peak ground displacement (PGD) has the less efficient.
