Journal ArticleDOI
Seismic Behavior of Batter Piles: Elastic Response
TLDR
In this article, the authors investigated the seismic response of groups containing nonvertical piles, including the lateral pile-head stiffnesses, the "kinematic" pile deformation, and the "inertial" soil-pile-structure response.Abstract:
Several aspects of the seismic response of groups containing nonvertical piles are studied, including the lateral pile-head stiffnesses, the "kinematic" pile deformation, and the "inertial" soil-pile-structure response. A key goal is to explore the conditions under which the presence of batter piles is beneficial, indifferent, or detrimental. Parametric analyses are carried out using three-dimensional finite-element modeling, assuming elastic behavior of soil, piles, and superstructure. The model is first used to obtain the lateral stiffnesses of single batter piles and to show that its results converge to the available solutions from the literature. Then, real accelerograms covering a broad range of frequency characteristics are employed as base excitation of simple fixed-head two-pile group configurations, embedded in homogeneous, inhomogeneous, and layered soil profiles, while supporting very tall or very short structures. Five pile inclinations are considered while the corresponding vertical-pile group results serve as reference. It is found that in purely kinematic seismic loading, batter piles tend to confirm their negative reputation, as had also been found recently for a group subjected to static horizontal ground deformation. However, the total (kinematic plus inertial) response of structural systems founded on groups of batter piles offers many reasons for optimism. Batter piles may indeed be beneficial (or detrimental) depending on, among other parameters, the relative size of the overturning moment versus the shear force transmitted onto them from the superstructure.read more
Citations
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Journal ArticleDOI
A numerical model for the dynamic analysis of inclined pile groups
TL;DR: In this paper, a numerical model for the dynamic analysis of pile groups with inclined piles in horizontally layered soil deposits is presented, where piles are modelled with Euler-Bernoulli beams, while the soil is supposed to be constituted by independent infinite viscoelastic horizontal layers.
Journal ArticleDOI
Centrifuge modeling of batter pile foundations under earthquake excitation
TL;DR: In this article, an experimental dynamic centrifuge program is presented, where the influences of the base shaking signal and the height of the gravity center of the superstructure are investigated, and the differences in the behavior of batter and vertical piles under seismic soil-pile-superstructure interaction.
Journal ArticleDOI
Efficient numerical model for the computation of impedance functions of inclined pile groups in layered soils
Guillermo M. Álamo,Alejandro E. Martínez-Castro,Luis A. Padrón,Juan J. Aznárez,Rafael Gallego,Orlando Maeso +5 more
TL;DR: In this article, a numerical model was proposed to obtain the time-harmonic dynamic response of pile foundations in non-homogeneous soils, based on integral formulation of the elastic problem and the use of Green's functions for the layered halfspace.
Journal ArticleDOI
Soil-structure interaction effects in single bridge piers founded on inclined pile groups
TL;DR: In this paper, the authors investigated the seismic response of bridge piers founded on inclined pile groups in different soil deposits, evaluating effects of soil-structure interaction induced by different pile group geometries and piles inclinations.
Journal ArticleDOI
Model tests and numerical analyses on horizontal impedance functions of inclined single piles embedded in cohesionless soil
TL;DR: In this article, the horizontal impedance functions of inclined single piles are measured experimentally for model soil-pile systems with both the effects of local soil nonlinearity and resonant characteristics.
References
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Book
Pile Foundation Analysis and Design
Harry G. Poulos,E.H. Davis +1 more
TL;DR: In this paper, the authors present a consistent theoretical approach to the prediction of pile deformation and load capacity, and present parametric solutions for a wide range of cases, demonstrating how such solutions can be used for design purposes, and review the applicability of these approaches to practical problems.
Journal ArticleDOI
The response of flexible piles to lateral loading
TL;DR: In this article, a parametric study was conducted using the finite element method and treating the soil as an elastic continuum with a linearly varying soil modulus, and the results of a simple algebraic expression for the active length of the pile; the ground level deformations; and the maximum bending moment down the pile were presented.
Journal ArticleDOI
The behaviour of axially and laterally loaded single piles embedded in nonhomogeneous soils
P. K. Banerjee,T. G. Davies +1 more
TL;DR: In this article, an approximate elastic analysis is made of the working load responses of single piles embedded in a soil of linearly increasing modulus with depth, which is of comparable generality and computational efficiency to earlier elastic solutions of the corresponding homogeneous problem.
Journal Article
Seismic Soil-Structure Interaction: New Evidence and Emerging Issues
George Gazetas,George Mylonakis +1 more
Dissertation
Dynamic stiffness and seismic response of pile groups
Amir M. Kaynia,Eduardo Kausel +1 more
TL;DR: In this paper, a formulation for the analysis of pile groups in layered semi-infinite media is presented based on the introduction of a soil flexibility matrix as well as on dynamic stiffness and flexibility matrices of the piles to relate the discretized uniform forces to the corresponding displacements at the pilesoil interface.
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