Evidence of beneficial role of inclined piles: observations and summary of numerical analyses |
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Authors: | Nikos Gerolymos Amalia Giannakou Ioannis Anastasopoulos George Gazetas |
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Institution: | (1) National Technical University, Athens, Greece;(2) School of Civil Engineering, National Technical University, Athens, Greece |
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Abstract: | The behaviour under seismic loading of inclined piles embedded in two idealized soil profiles, a homogeneous and a non-homogenous
“Gibson” soil, is analysed with 3D finite elements. Two structures, modeled as single-degree-of-freedom oscillators, are studied:
(1) a tall slender superstructure (H
st = 12 m) whose crucial loading is the overturning moment, and (2) a short structure (H
st = 1 m) whose crucial loading is the shear force. Three simple two-pile group are studied: (a) one comprising a vertical pile
and a pile inclined at 25°, (b) one consisting of two piles symmetrically inclined at 25°, and (c) a group of two vertical
piles. The influence of key parameters is analysed and non-dimensional diagrams are presented to illustrate the role of raked
piles on pile and structure response. It is shown that this role can be beneficial or detrimental depending on a number of
factors, including the slenderness of the superstructure and the type of pile-to-cap connection. |
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Keywords: | Inclined pile 3D finite element model Seismic response Group of piles Pile-to-cap connection Soil– pile– bridge pier interaction Field observations |
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