Performance-based analysis of Transit tunnels in the Chilean subduction zone

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dc.contributor.authorLyon, Benjamín
dc.contributor.authorCandia, Gabriel
dc.contributor.authorGutiérrez, Carlos
dc.contributor.authorMacedo, Jorge
dc.date.accessioned2021-11-26T19:16:37Z
dc.date.available2021-11-26T19:16:37Z
dc.date.issued2022
dc.description.abstractIn this article, we study the seismic response of a shallow metro tunnel in a subduction zone environment and the use of a performance-based approach to develop seismic demand hazard curves (SDHC) of key engineering demand parameters, such as drift ratio, surface settlement, bending moment, and axial loads. The tunnel consists of a 6-m diameter sprayed concrete lining in medium dense soil and is located in Santiago, Chile. To simulate its seismic response, a finite element model of the soil–tunnel system was implemented in OpenSees and validated against centrifuge test results, linear-equivalent solutions for a 1D soil column, and single elements in cyclic simple shear. The tunnel response was computed for 112 ground motions, selected and scaled using the conditional scenario approach. This approach assigns a rate of occurrence to each ground motion and therefore, allows for a direct computation of annual exceedance rates of the tunnel response parameters. For instance, at this specific location, the 2500-yr return period drift ratio in the lining is approximately 0.25% as a result of large deformations imposed by the surrounding soil. Likewise, axial loads between 0.3 and 1.0 MN/m and vending moments of ±0.2 MN∙m/m are apparent from the axial load-moment interaction diagrams; these results are of great value for the design and verification of the tunnel based on the collapse or life-safety limit states. Notably, the current formulation relaxes the assumption of scaling ground motions to a particular intensity measure and can be a computationally efficient alternative to standard incremental dynamic analyseses
dc.identifier.citationBenjamín Lyon, Gabriel Candia, Carlos Gutiérrez, Jorge Macedo, Performance-based analysis of Transit tunnels in the Chilean subduction zone, Soil Dynamics and Earthquake Engineering, Volume 152, 2022, 107047es
dc.identifier.urihttps://doi.org/10.1016/j.soildyn.2021.107047es
dc.identifier.urihttp://hdl.handle.net/11447/5119
dc.language.isoenes
dc.relation.projectProyecto FONDECYT 11180937
dc.subjectShallow tunnelses
dc.subjectEarthquakeses
dc.subjectSubductiones
dc.subjectSeismic hazardes
dc.subjectConditional scenarioes
dc.subjectCentrifuge experimentses
dc.subjectFinite elementses
dc.titlePerformance-based analysis of Transit tunnels in the Chilean subduction zonees
dc.typeArticlees

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