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Load Transfer Mechanism of an Anchor Foundation System through 3D Finite Element Modeling
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.
Load Transfer Mechanism of an Anchor Foundation System through 3D Finite Element Modeling
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.
Load Transfer Mechanism of an Anchor Foundation System through 3D Finite Element Modeling
Vitali, Osvaldo P. M. (author) / Nasim, Mohammad (author) / Khasawneh, Yazen (author)
Geo-Congress 2023 ; 2023 ; Los Angeles, California
Geo-Congress 2023 ; 573-581
2023-03-23
Conference paper
Electronic Resource
English
Load Transfer Mechanism of an Anchor Foundation System through 3D Finite Element Modeling
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