Numerical modelling of a tunnel adjacent to a surface structure in liquefiable ground

Zhang, Jinghua; Bilotta, Emilio; Madabhushi, Spg; Yuan, Yong

doi:10.1680/jgeot.22.00418

Cited by 9 publications

(2 citation statements)

References 39 publications

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“…The fiber-type beam elements have proven to be suitable for describing the seismic response of the box-type stations. 39 The concrete fiber measured 20.0 mm × 20.0 mm as seen in Figure 2C. For simplicity, a node-to-node fixed constraint was employed to simulate the soil-structure interaction, as variations in the friction coefficient at the soil-structure interface had little impact on the lateral deformation of the station.…”

Section: Model Descriptionmentioning

confidence: 99%

“…The size of the soil mesh was taken as 1 m × 1 m. The lengths of all structural components, such as floors, roofs, sidewalls, and central columns, were set to approximately 1.0 m to achieve nodal connectivity with the soil elements. 39 The models of single-story, two-span stations with various buried depths were designed to examine how the axial force affected the seismic performance of the central columns. The height of each of these three stations was 7.17 m, with a station span of 17.0 m. The column spacing of the subway station was designated as 2.6 m. The static analyses of subway stations with a buried depth of 1.3, 3.8, and 4.8 m showed that the initial axial compressions of central columns were 1080.0, 2150.0, and 2600.0 kN.…”

Section: Model Descriptionmentioning

confidence: 99%

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Effects of axial compression ratio on seismic behavior of shallow‐buried rectangular stations: Hybrid simulation and quasi‐static test

Cai,

Yang,

Liu

et al. 2024

Earthq Engng Struct Dyn

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In the absence of experimental investigations on column members of underground structures, full‐scale column specimens were tested to explore the seismic behavior of shallow‐buried subway stations at various depths. The axial compression ratios of internal column specimens were set as 0.16, 0.33, and 0.40. Both hybrid simulations and quasi‐static tests were performed on the station columns. The hybrid simulations illustrated the drift demands of internal columns, while the load‐carrying capacity and deformation capacity were obtained from the quasi‐static tests. Hybrid simulations at low, moderate, and high‐intensity levels were conducted to study the seismic responses of shallow‐buried rectangular stations. The hybrid simulations suggest that the most severe damage occurred in the station when the axial compression ratio of the tested column reached 0.40. Central columns suffered severe stiffness deterioration under high‐level earthquake excitation, especially in stations at greater depths. Meanwhile, the quasi‐static test results indicate that the ultimate load of the central columns increases with increasing axial compression, but this leads to a significant decrease in the ductility of columns. Besides, the sectional analysis results show that the central columns are prone to tension‐controlled failure, and the safety margin for flexural response deteriorates with an increasing axial compression ratio. The test results indicate that shallow‐buried rectangular stations are susceptible to flexure‐controlled structural failure when their central columns possess a relatively low axial compression ratio and a high shear span‐to‐depth ratio. The failure mechanism of station columns is revealed by both the hybrid simulations and quasi‐static tests, and the findings from the full‐scale tests are beneficial for the practical design of shallow‐buried rectangular stations.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%