de Silva, F, Fabozzi, S, Nikitas, N orcid.org/0000-0002-6243-052X et al. (2 more authors) (2020) Seismic vulnerability of circular tunnels in sand. Géotechnique. pp. 1-34. ISSN 0016-8505
Abstract
The paper is focused on the assessment of seismic fragility curves for circular tunnels under moderate to severe earthquakes with the aim of improving the reliability of the risk assessment of underground infrastructural networks. Non-linear two-dimensional dynamic analyses were performed on different tunnel and soil configurations by using the finite difference method implemented in FLAC2D software. The applied input motions were selected considering their amplitude and frequency content variability. The response accelerations and predominant frequencies computed at ground level above the tunnel, were compared with the corresponding free-field results to distinguish the effects due to the tunnel presence from the ones due to the site amplification. Tunnel safety was assessed through fragility curves, taking into account the dependence of tunnel lining bending resistance on the axial force variation during the earthquake. The more effective intensity measure was investigated correlating the tunnel performance to peak ground accelerations and peak ground velocities computed at the ground level and at the bedrock depth, respectively. The resulting fragility curves showed a satisfying matching with the empirical ones, generated on the basis of the observed seismic damages on tunnels.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Published with permission by the ICE under the CC-BY license |
Keywords: | Dynamics; Earthquakes; Limit state design/analysis; numerical |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/N03435X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 Feb 2020 11:54 |
Last Modified: | 25 Jun 2023 22:09 |
Status: | Published online |
Publisher: | Thomas Telford Ltd. |
Identification Number: | 10.1680/jgeot.19.sip.024 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157179 |