Load Transfer Mechanism of an Anchor Foundation System through 3D Finite Element Modeling
Publication: Geo-Congress 2023
ABSTRACT
The anchor foundation system has been used successfully to support transmission lines and onshore wind turbines due to its inherent resistance to overturning moments, which will result in a large rotational stiffness. In this paper, the complex load transfer mechanism of the anchor foundation system is investigated in detail, and its performance is evaluated to demonstrate the effect of pre-stressing of the ground anchors. Three-dimensional numerical simulations were conducted to investigate the soil-structure interaction of the anchors and of the concrete cap in detail. The soil constitutive model used in this study is the well-established and documented hardening soil model, which was calibrated with laboratory tests. The selected soil model can capture the effective confining stress-stiffness dependency and the expansion of the yield surface, which is necessary to capture the ground improvement achieved by prestressing of the anchors. The numerical models demonstrated that the ground anchors’ prestress magnitude has significant effect on the foundation response through two mechanisms: the ground improvement and additional resistance to uplift forces. The results demonstrated that the anchor foundation system is an efficient and cost-effective solution for structures under large overturning moments, with superior performance in maintaining the serviceability requirements under large load demands.
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REFERENCES
Bhattacharya, S. (2019). Design of Foundations for Offshore Wind Turbines. John Wiley & Sons Ltd.
Fahey, M., and Carter, J. P. (1993). A finite element study of the pressuremeter test in sand using a nonlinear elastic plastic model. Canadian Geotechnical Journal 30 (2), 348–362.
Mayne, P. W. (2001). Stress-strain-strength-flow parameters from enhanced in-situ tests. Proceedings, International Conference on In-Situ Measurement of Soil Properties & Case Histories [In-Situ 2001], Bali, Indonesia, May 21-24, 2001, pp. 27–48.
Vitali, O. P. M., Celestino, T. B., and Bobet, A. (2018). 3D finite element modelling optimization for deep tunnels with material nonlinearity. Undergr. Sp., 3(2):125–139. https://doi.org/10.1016/j.undsp.2017.11.002.
Vitali, O. P. M., Nasim, M., and Khasawneh, Y. (2021a). An enhanced P&H tensionless pier foundation for onshore wind turbines. In: Proceedings of the 46th Annual Conference on Deep Foundations (DFI 2021). 656–665. Las Vegas, NV.
Vitali, O. P. M., Nasim, M., and Khasawneh, Y. (2021b). Cyclic degradation on wind turbine foundations in cohesive soils. In: Proceedings of the 46th Annual Conference on Deep Foundations (DFI 2021). 666–675. Las Vegas, NV.
Vitali, O. P. M., Celestino, T. B., and Bobet, A. (2021c). New modeling approach for tunnels under complex ground and loading conditions. Soils and Rocks 44(1):e2021052120.
Vitali, O. P. M., Nasim, M., and Khasawneh, Y. (2021d). 3D FEM modelling of a ground improvement solution. In: Proceedings of the 46th Annual Conference on Deep Foundations (DFI 2021). 560–568. L.as Vegas, NV.
Vitali, O. P. M., Nasim, M., and Khasawneh, Y. (2022). Cyclic and Monotonic Behavior of Onshore Wind Turbine Foundation Systems in Cohesionless Ground. In: Proceedings of the Geo-congress 2022. GSP 332, 228–237. doi/10.1061/9780784484029.022.
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Geo-Congress 2023
Pages: 573 - 581
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Published online: Mar 23, 2023
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