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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/49673

Title: A proposal for normalized impedance functions of inclined piles in non-homogeneous media
Authors: Álamo, Guillermo M.
Martínez Castro, Alejandro E.
Padrón, Luis A.
Aznárez, Juan J.
Gallego Sevilla, Rafael
Maeso, Orlando
Issue Date: 2017
Abstract: This work presents impedance functions for inclined pile groups embedded in different half spaces whose stiffness continuously increases with depth. The results are obtained through a three-dimensional harmonic model where the soil response is modelled through the reciprocity theorem in elastodynamics and the use of Green’s functions for the layered half space, while the piles are represented by finite elements as Timoshenko’s beams. Linear behaviour of soil and piles is assumed. The use of several normalization schemes for the representation of the impedance functions is discussed, highlighting the benefits and drawbacks of each choice and their effects on the interpretation of the obtained results. As a result, expressions for the dimensionless impedance functions and frequency are proposed in order to synthesize the results of the different soil profiles into the same curves. The final objective of the proposed normalization is to transform the well-known impedance functions for the homogeneous halfspace into the corresponding curves for a specific non-homogeneous profile that can be used, e.g., in a substructuring methodology. Despite the fact that the presence of soil non-homogeneity increases the dependence of the impedance functions on the frequency, good agreements between the homogeneous and non-homogeneous profiles can be achieved for a range of frequency of interest.
Sponsorship: This work was supported by Subdirección General de Proyectos de Investigación of the Ministerio de Economía y Competitividad (MINECO) of Spain and FEDER through research project BIA2014-57640-R. G.M. Álamo is a recipient of FPU research fellowship FPU14/06115 from the Ministerio de Educación, Cultura y Deporte of Spain.
Publisher: Elsevier
Description: 10th International Conference on Structural Dynamics (EURODYN). Sapienza University Rome, September, 10-13, 2017.
Keywords: Inclined piles
Layered halfspace
Impedance functions
Normalization schemes
Green's functions
URI: http://hdl.handle.net/10481/49673
ISSN: 1877-7058
Citation: Álamo, G.M.; et al. A proposal for normalized impedance functions of inclined piles in non-homogeneous media. Procedia Engineering, 199: 86-91 (2017). [http://hdl.handle.net/10481/49673]
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