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Ring foundations, characterized by circular geometry, offer a synergistic blend of economic viability and sustainability, attributed to their efficient use of concrete relative to analogous circular footings. They are used to support axisymmetric structures like silos, tanks, chimneys, and more recently offshore wind turbines. Due to the widespread utilization of ring foundations, their static analysis in homogeneous soil has been a focal point of interest among geotechnical engineers in past. The confluence of past seismic events and the prevalence of layered soil profiles in practical field scenarios underscore the imperative for an extensive seismic assessment of ring foundations on dense sand over loose sand. In the present study, a three-dimensional (3D) Finite-Element (FE) analysis is performed in ABAQUS Cae. The soil was modeled using the Mohr–Coulomb elastic perfectly plastic material model while the ring foundation was rendered elastic and perfectly rigid. Throughout the analysis, the properties of the lower layer and the upper layer were systematically altered to examine their impact on the bearing capacity of the ring footing. The seismic analysis was conducted utilizing the pseudo-static approach, in which the earthquake forces were converted to equivalent horizontal and vertical forces using horizontal and vertical seismic acceleration coefficients kh and kv, respectively. A comprehensive analysis of the effect of the friction angle of the upper layer and lower layer, i.e., ϕ1 and ϕ2, respectively, kh, kv/kh on the seismic bearing capacity of the ring foundation was undertaken. Findings revealed a favorable correlation between the friction angle and bearing capacity, whereas kh and kv/kh exhibited a detrimental impact. A greater deterioration in the bearing capacity with increased seismic acceleration coefficients was found to occur for higher values of the friction angle. Finally, the current study presents a comparative analysis between the obtained results and existing static and pseudo-static findings, emphasizing the adopted assumptions within the present investigation.

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Seismic Bearing Capacity Assessment of Ring Foundations in Dense Sand Over Loose Sand

  • 会议论文

  • 发表日期：

    2025年

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  • Pratik Goel,
  • Puran,
  • Kaustav Chatterjee

摘要

Ring foundations, characterized by circular geometry, offer a synergistic blend of economic viability and sustainability, attributed to their efficient use of concrete relative to analogous circular footings. They are used to support axisymmetric structures like silos, tanks, chimneys, and more recently offshore wind turbines. Due to the widespread utilization of ring foundations, their static analysis in homogeneous soil has been a focal point of interest among geotechnical engineers in past. The confluence of past seismic events and the prevalence of layered soil profiles in practical field scenarios underscore the imperative for an extensive seismic assessment of ring foundations on dense sand over loose sand. In the present study, a three-dimensional (3D) Finite-Element (FE) analysis is performed in ABAQUS Cae. The soil was modeled using the Mohr–Coulomb elastic perfectly plastic material model while the ring foundation was rendered elastic and perfectly rigid. Throughout the analysis, the properties of the lower layer and the upper layer were systematically altered to examine their impact on the bearing capacity of the ring footing. The seismic analysis was conducted utilizing the pseudo-static approach, in which the earthquake forces were converted to equivalent horizontal and vertical forces using horizontal and vertical seismic acceleration coefficients kh and kv, respectively. A comprehensive analysis of the effect of the friction angle of the upper layer and lower layer, i.e., ϕ1 and ϕ2, respectively, kh, kv/kh on the seismic bearing capacity of the ring foundation was undertaken. Findings revealed a favorable correlation between the friction angle and bearing capacity, whereas kh and kv/kh exhibited a detrimental impact. A greater deterioration in the bearing capacity with increased seismic acceleration coefficients was found to occur for higher values of the friction angle. Finally, the current study presents a comparative analysis between the obtained results and existing static and pseudo-static findings, emphasizing the adopted assumptions within the present investigation.