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http://dx.doi.org/10.7843/kgs.2018.34.11.71

Seismic Fragility Evaluation of Cut-and-cover Tunnel  

Park, Duhee (Dept. of Civil and Environmental Engrg., Hangyang Univ.)
Nguyen, Duy-Duan (Dept. of Civil Engrg., Konkuk Univ.)
Lee, Tae-Hyung (Dept. of Civil Engrg., Konkuk Univ.)
Nguyen, Van-Quang (Dept. of Civil and Environmental Engrg., Hangyang Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.11, 2018 , pp. 71-80 More about this Journal
Abstract
In this study, the seismic response of cut-and-cover box tunnels is evaluated from pseudo-static analyses and the fragility curves are derived. A series of site profiles were used to evaluate the effect of soil conditions. A total of 20 ground motions were used. The fragility curves were developed as functions of peak ground acceleration for three damage states, which are minor, moderate, and extensive states. The damage indices, defined as the ratio of the elastic moment to the yield moment, correlated to three damage states, were used. The curves are shown to greatly depend on the site profile. The curves are further compared to those derived in previous studies. The widely used empirically derived curves are shown not to account for the site effects, and therefore underestimate the response for soft sites.
Keywords
Cut-and-cover box tunnel; Seismic fragility curve; Damage state; Pseudo-static analysis; Inelastic frame model;
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