The Lateral Response of Single Free Headed Piles in Sandy Soils - Methods, Measurements and Reliability

Published on Mar 10, 2009
· DOI :10.1061/41022(336)75
Ayhan Gurbuz8
Estimated H-index: 8
,
Samuel G. Paikowsky14
Estimated H-index: 14
Source
Abstract
Piles require withstanding lateral loads from various sources such as wind, waves, traffic, earthquake, soil and water. While the Strength Limit State controls the design of axially loaded piles, serviceability often controls the design of laterally loaded piles, i.e. the applied load is controlled by the magnitude of the limiting lateral displacement. The analysis of laterally loaded piles is complicated due to the pile-soil interaction, where the lateral soil resistance developed along the pile is a function of the pile’s deflection being a function of the soil’s resistance. Laterally loaded piles are commonly designed using computer-based analysis methods solving the differential equation of a beam on elastic foundation that controls the load-deflection relations, utilizing what is known as p-y curves for the local spring factor-load-deflection relations. Software packages; LPile 5 Plus in which the p-y curves are constituted based on past pile load tests and soil testing results, and the Strain Wedge Model (SWM) in which the p-y curves are derived from the assumption of a wedge failure zone ahead of the pile, were used in this study. Both analyses were employed in a parametric study, calculating the piles’ top lateral forces required to obtain given lateral displacements ranging from 0.5 in to 3 in (12.7 to 75.6 mm) in 0.5 in intervals. The results for the two methods are compared and examined against a database of laterally load tested piles. Factors affecting the performance of the analyses are discussed.
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#1Samuel G. PaikowskyH-Index: 14
#2Ye LuH-Index: 6
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Load-deflection relations of piles subjected to lateral loading are routinely required for design. The use of large diameter open pipe piles became common since its application as foundations for offshore structures, and more recently for bridge retrofitting and new construction designed for withstanding earthquake loading. The accuracy and reliability of the analysis methods remains usually unknown as it requires the systematic examination of the measured performance of many piles. As part of a...
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#1H MatlockH-Index: 1
#1Mohamed Ashour (UNR: University of Nevada, Reno)H-Index: 11
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This paper demonstrates the application of the strain wedge ~SW! model to assess the response of laterally loaded isolated long piles, drilled shafts, and pile groups in layered soil ~sand and/or clay! and rock deposits. The basic goal of this paper is to illustrate the capabilities of the SW model versus other procedures and approaches. The SW model has been validated and verified through several comparison studies with model- and full-scale lateral load tests. Several factors and features rela...
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The p‐y method of analysis models nonlinear behavior, and is an effective method of designing deep foundations subjected to, lateral loads. Deflections and bending moments calculated using p‐y analyses have usually been found to be in good agreement with field measurements. This paper describes a method of analysis, the characteristic load method (CLM) that is simpler than p‐y analyses, but that closely approximates p‐y analysis results. The method uses dimensional analysis to characterize the n...
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#1Hudson Matlock (University of Texas at Austin)H-Index: 9
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Using results from lateral load test on 24 in. pipe pile and laboratory tests on undisturbed clay samples, tentative procedure for estimating soil modulus of pile reaction is developed for problems involving transient loads; correlation derived is based on similitude on logarithmic paper of laboratory stress strain curve and soil reaction deflection curves from pile test.
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#2Charles Wang Wai Ng (HKUST: Hong Kong University of Science and Technology)H-Index: 65
ABSTRACTLaterally-loaded vertical piles are commonly designed by p-y curves or two-dimensional (2D) analytical methods. The former are vaguely correlated while the latter are oversimplified and conservative. Three-dimensional (3D) analysis can be used, but it is time consuming for practical applications. An improved analytical cone method is thus developed using spreadsheets. Subject to the lateral load under greenfield condition, the soil in front of a vertical pile is under constant volume pla...
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