Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A numerical procedure to correlate the subgrade reaction coefficient with soil stiffness properties for laterally loaded piles using the FSAFEM
The soil subgrade coefficient is a significant parameter in the Winkler model which is usually required in the practical design of piles against lateral loads. However, the accurate assessment of this coefficient is often difficult to establish, consequently, the most obvious way to reach appropriate values of k s seems to find correlations with soil stiffness properties: the Young’s modulus and the Poisson's ratio that cause predictions match more rigorous elasticity results. Since the problem of a vertical pile under horizontal loading is geometrically axisymmetric but the loading is non-axisymmetric, it is convenient to employ a finite element procedure known as Fourier Series Aided Finite Element Analysis to handle this problem including the soil/pile interface states. The methodology followed in this paper has been cast into two major steps. Firstly, and in order to obtain a correlation between k s and soil deformation properties E s and ν s in the form of analytical equations expressed in a dimensionless factor , a pile segment at the centre of a thin slice from the soil/pile system is displaced horizontally and the soil reaction is back-figured in function of various outer boundaries of the modelled medium. Secondly, the analytical formulae obtained along with other proposed expressions collected from the literature have been implemented in an existing Winkler model computer code. Then, piles with two different slenderness ratios ( and 20) under both horizontal force an overturning moment in a homogeneous soil where two pile/soil interface states have been studied by Winkler models as well as by a full finite element semi-analytical approach. Results of the parametric study showed that the drawbacks of the Winkler model are not due to the inaccuracy in the stiffness of springs used to model the soil, but to the model itself which ignores the transfer of shear stresses between the soil layers.
A numerical procedure to correlate the subgrade reaction coefficient with soil stiffness properties for laterally loaded piles using the FSAFEM
The soil subgrade coefficient is a significant parameter in the Winkler model which is usually required in the practical design of piles against lateral loads. However, the accurate assessment of this coefficient is often difficult to establish, consequently, the most obvious way to reach appropriate values of k s seems to find correlations with soil stiffness properties: the Young’s modulus and the Poisson's ratio that cause predictions match more rigorous elasticity results. Since the problem of a vertical pile under horizontal loading is geometrically axisymmetric but the loading is non-axisymmetric, it is convenient to employ a finite element procedure known as Fourier Series Aided Finite Element Analysis to handle this problem including the soil/pile interface states. The methodology followed in this paper has been cast into two major steps. Firstly, and in order to obtain a correlation between k s and soil deformation properties E s and ν s in the form of analytical equations expressed in a dimensionless factor , a pile segment at the centre of a thin slice from the soil/pile system is displaced horizontally and the soil reaction is back-figured in function of various outer boundaries of the modelled medium. Secondly, the analytical formulae obtained along with other proposed expressions collected from the literature have been implemented in an existing Winkler model computer code. Then, piles with two different slenderness ratios ( and 20) under both horizontal force an overturning moment in a homogeneous soil where two pile/soil interface states have been studied by Winkler models as well as by a full finite element semi-analytical approach. Results of the parametric study showed that the drawbacks of the Winkler model are not due to the inaccuracy in the stiffness of springs used to model the soil, but to the model itself which ignores the transfer of shear stresses between the soil layers.
A numerical procedure to correlate the subgrade reaction coefficient with soil stiffness properties for laterally loaded piles using the FSAFEM
Medjitna, Lamia (Autor:in) / Amar Bouzid, Djillali (Autor:in)
International Journal of Geotechnical Engineering ; 13 ; 458-473
03.09.2019
16 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Subgrade Modulus for Laterally Loaded Piles
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