Liquefaction Induced Lateral Spreading And Its Effects On Pile Foundations
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Liquefaction Induced Lateral Spreading And Its Effects On Pile Foundations
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Author : Liangcai He
language : en
Publisher:
Release Date : 2005
Liquefaction Induced Lateral Spreading And Its Effects On Pile Foundations written by Liangcai He and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Effects Of Liquefaction Induced Lateral Spreading On Pile Foundations
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Author : John Charles Horne
language : en
Publisher:
Release Date : 1996
Effects Of Liquefaction Induced Lateral Spreading On Pile Foundations written by John Charles Horne and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Piling (Civil engineering) categories.
Lateral Spreading Effects On Pile Foundations
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Author : Ahmed Amr Ebeido
language : en
Publisher:
Release Date : 2019
Lateral Spreading Effects On Pile Foundations written by Ahmed Amr Ebeido and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Current techniques for assessing the effects of liquefaction-induced lateral spreading on pile foundations are based on simplified analytical methods that potentially lead to estimates that vary within a wide range. This might lead to potential excessive design demands, with high expenses for pre-event mitigation. Conversely, underestimated design demands might lead to costly post-event damage remediation. The conducted study is directed towards enhancements to the assessment of liquefaction induced lateral spreading effects on bridge foundation systems. Current simplified analysis techniques have been only been developed recently in preliminary form. In addition, quantitative data sets from large-scale experimentation are needed concerning the response of such ground-foundation scenarios. An effort was undertaken to address the simplified method areas of applicability and potential for enhancements. Challenges in implementing the methodology are presented within a comparative scope contrasting results of a California bridge site from different studies. On this basis, insights are derived for improvement of the currently employed simplified analysis guidelines. Furthermore, large scale shake table testing was performed on pile foundation-ground systems, under conditions of liquefaction-induced lateral spreading. A total of 7 different experiments were conducted with varying heights, ground inclination, soil profiles, pile material and cross-section. The tested models were densely instrumented, including strain gauges, total pressure and excess pore-pressure sensors, accelerometers and displacement pots. In addition, data from 4 different experiments conducted in the NIED Japan shake table facility, including single piles and pile groups and varying soil profiles were utilized to provide additional insights and characteristics. In these tests, the laminar soil container was placed in a mildly-inclined configuration to allow for accumulation of the liquefaction-induced lateral deformations. Detailed instrumentation and data interpretation procedures enable measurement of the fundamental soil-pile interaction behavior. The loading mechanisms have large cyclic components that may act in-phase or out-of-phase along the pile embedded length. The conducted heavily instrumented tests resulted in a wealth of quantitative response data sets, to be used for: i) drawing insights and recommendations of practical significance based directly on the observed response, ii) calibration of simplified and more elaborate computational analysis tools, and iii) enhancement of our design guidelines and practical assessment procedures. Monotonic pushover analysis based on newly derived p-y curves in this study is found to provide useful design estimates in good agreement with the observed experimental results.
Development Of A Design Guideline For Pile Foundations Subjected To Liquefaction Induced Lateral Spreading
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Author :
language : en
Publisher:
Release Date : 2021
Development Of A Design Guideline For Pile Foundations Subjected To Liquefaction Induced Lateral Spreading written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Foundations categories.
Extensive loss of stiffness and strength in liquefied soils can cause large ground deformations during strong earthquake shaking. One of the major sources of damage in pile foundations in liquefied soil is the excessive deformation due to lateral spreading. Pile-supported wharves subjected to earthquake motions are expected to accommodate inertial loads imposed at pile head from the superstructure as well as the kinematic loads imposed on piles from the lateral ground deformations. Current design codes significantly vary on how to combine inertia and kinematic demands. Recent research on soil-foundation-structure interaction suffers from lack of experiment-based data. There is a serious need to fill the knowledge gap and help designers to better evaluate risk and design cost-effective pile foundations. In this research, the interaction of inertial and kinematic demands is investigated using data from five well-instrumented centrifuge tests on pile-supported wharves. The observations from these tests were used to investigate the time- and depth-dependent nature of kinematic and inertial demands on the deep foundations during earthquake loading. The test results were analyzed to provide the relative contributions of peak inertial loads and peak soil displacements during critical cycles, and the data revealed the depth-dependency of these factors. The results were used to refine existing guidelines for design of pile-supported wharves subjected to foundation deformations. The observations from centrifuge tests were then used to evaluate the accuracy of the equivalent static analysis (ESA) procedure using p-y models for the design of pile-supported wharves subjected to lateral ground deformations during earthquake loading. The piles in these centrifuge tests were subjected to the combined effects of wharf deck inertial loads and ground deformations. The experiments included soil properties ranging from nonliquefiable to fully liquefied cases which provided a wide range of conditions against which the ESA method could be evaluated. Finally, a nonlinear dynamic model of a pile-supported wharf was created and calibrated using recorded data from a centrifuge test. The objective of the numerical modeling was to create a calibrated numerical model that captures key responses of the wharf and the soil in order to be used in subsequent studies that are too costly and time-consuming to do using physical modeling. The calibrated numerical model was then used in an incremental dynamic analysis to evaluate the effects of ground motion duration on the dynamic response of a pile-supported wharf subjected to liquefaction-induced lateral ground deformations. The analysis results provided insights on the relative contribution of inertial and kinematic demands on the response of the wharf with respect to motion duration.
Single Response To Liquefaction Induced Lateral Spreading
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Author :
language : en
Publisher:
Release Date : 2005
Single Response To Liquefaction Induced Lateral Spreading written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
A review of liquefaction-induced lateral spreading and its effects on pile foundations has been presented. A review of currently available methods of analysis for prediction of bending moments and deflections of a single pile subjected to lateral spreading has also been conducted. The methods included in this study are: (a) Deformation method, (b) Japanese Road Association (JRA) method, (c) Limit Equilibrium method, (d) Hybrid force-deformation imposed method, and (e) Finite element method. Numerical analyses were conducted on single piles subjected to lateral spreading, using ABAQUS, based on the first four methods indicated above. The numerical analyses involved three different soil-pile configurations: (a) a two-layer soil profile without a non-liquefiable soil crust, (b) a three-layer soil profile with a non-liquefiable soil crust underlain by liquefiable soil over a dense sand, and (c) a three-layer soil profile like that of case (b) with a lateral deformation constraint at the pile head. The results were compared with a limited number of centrifuge data on single piles. The purpose was to calibrate these methods and assess their ability to capture the measured moment and deflection responses of single piles. The limit equilibrium method and the deformation-imposed method predicted the centrifuge data very well. The JRA method overpredicted both moments and pile deflections by as much as four times. Based on deformation imposed method, parametric analyses were also conducted to study the influence of: (i) the crust thickness, (ii) the liquefied layer thickness, (iii) the non-liquefied bottom layer thickness, (iv) the pile diameter, and (v) the lateral pile head deflection constraint, on pile response subjected to lateral displacements induced by soil liquefaction. The effects of these parameters on single pile response are presented.
Liquefaction Triggering In Low Plasticity Silts And Effects Of Liquefaction Induced Lateral Spreading On A Reinforced Concrete Pile
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Author :
language : en
Publisher:
Release Date : 2023
Liquefaction Triggering In Low Plasticity Silts And Effects Of Liquefaction Induced Lateral Spreading On A Reinforced Concrete Pile written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with Geotechnical engineering categories.
Liquefaction triggering and post-liquefaction effects on lateral loading of deep foundations is an emerging area of study. This project presents: the results of cyclic direct simple shear (CDSS) testing on a low-plasticity alluvial silt collected in Portland, Oregon; and analysis of the combined effects of liquefaction-induced lateral spreading on a reinforced-concrete pile using data collected from a shake table test. The former research determines the liquefaction susceptibility and post-liquefaction characteristics of a local transitional soil using stress-controlled CDSS testing, the latter explores the complex lateral loading a reinforced-concrete pile undergoes during seismic loading with liquefaction-induced lateral spreading of the ground surface. This project presents the research performed to comment on liquefaction susceptibility and its effects on deep foundations
Modeling Of Seismically Induced Lateral Spreading Of Multi Layered Soil And Its Effect On Pile Foundations
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Author : Tarek Hassan Abdoun
language : en
Publisher:
Release Date : 1997
Modeling Of Seismically Induced Lateral Spreading Of Multi Layered Soil And Its Effect On Pile Foundations written by Tarek Hassan Abdoun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Centrifugation categories.
Design Of Pile Foundations In Liquefiable Soils
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Author : Gopal Madabhushi
language : en
Publisher: Imperial College Press
Release Date : 2010
Design Of Pile Foundations In Liquefiable Soils written by Gopal Madabhushi and has been published by Imperial College Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Science categories.
Pile foundations are the most common form of deep foundations that are used both onshore and offshore to transfer large superstructural loads into competent soil strata. This book provides many case histories of failure of pile foundations due to earthquake loading and soil liquefaction. Based on the observed case histories, the possible mechanisms of failure of the pile foundations are postulated. The book also deals with the additional loading attracted by piles in liquefiable soils due to lateral spreading of sloping ground. Recent research at Cambridge forms the backbone of this book with the design methodologies being developed directly based on quantified centrifuge test results and numerical analysis. The book provides designers and practicing civil engineers with a sound knowledge of pile behaviour in liquefiable soils and easy-to-use methods to design pile foundations in seismic regions. For graduate students and researchers, it brings together the latest research findings on pile foundations in a way that is relevant to geotechnical practice. Sample Chapter(s). Foreword (85 KB). Chapter 1: Performance of Pile Foundations (4,832 KB). Contents: Performance of Pile Foundations; Inertial and Kinematic Loading; Accounting for Axial Loading in Level Ground; Lateral Spreading of Sloping Ground; Axial Loading on Piles in Laterally Spreading Ground; Design Examples. Readership: Researchers, academics, designers and graduate students in earthquake engineering, civil engineering and ocean/coastal engineering.
Single Piles In Liquefiable Ground
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Author : Rui Wang
language : en
Publisher: Springer
Release Date : 2016-03-17
Single Piles In Liquefiable Ground written by Rui Wang and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-03-17 with Science categories.
This thesis focuses on the seismic response of piles in liquefiable ground. It describes the design of a three-dimensional, unified plasticity model for large post-liquefaction shear deformation of sand, formulated and implemented for parallel computing. It also presents a three-dimensional, dynamic finite element analysis method for piles in liquefiable ground, developed on the basis of this model,. Employing a combination of case analysis, centrifuge shaking table experiments and numerical simulations using the proposed methods, it demonstrates the seismic response patterns of single piles in liquefiable ground. These include basic force-resistance mode, kinematic and inertial interaction coupling mechanism and major influence factors. It also discusses a beam on the nonlinear Winkler foundation (BNWF) solution and a modified neutral plane solution developed and validated using centrifuge experiments for piles in consolidating and reconsolidating ground. Lastly, it studies axial pile force and settlement during post-earthquake reconsolidation, showing pile axial force to be irrelevant in the reconsolidation process, while settlement is process dependent.
Pile Response To Liquefaction Induced Lateral Spread
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Author : Wolfgang Daniel Meyersohn
language : en
Publisher:
Release Date : 1994
Pile Response To Liquefaction Induced Lateral Spread written by Wolfgang Daniel Meyersohn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Lateral loads categories.