Assessment Of Axially Loaded Pile Dynamic Design Methods And Review Of Indot Axially Loaded Pile Design Procedure
DOWNLOAD
Download Assessment Of Axially Loaded Pile Dynamic Design Methods And Review Of Indot Axially Loaded Pile Design Procedure PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Assessment Of Axially Loaded Pile Dynamic Design Methods And Review Of Indot Axially Loaded Pile Design Procedure book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Assessment Of Axially Loaded Pile Dynamic Design Methods And Review Of Indot Axially Loaded Pile Design Procedure
DOWNLOAD
Author : Dimitrios Loukidis
language : en
Publisher: Purdue University Press
Release Date : 2008-03-01
Assessment Of Axially Loaded Pile Dynamic Design Methods And Review Of Indot Axially Loaded Pile Design Procedure written by Dimitrios Loukidis and has been published by Purdue University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-03-01 with Transportation categories.
The general aim of the present research is to identify areas of improvement and propose changes in the current methodologies followed by INDOT for design of axially loaded piles, with special focus on the dynamic analysis of pile driving. Interviews with INDOT geotechnical engineers and private geotechnical consultants frequently involved in INDOT's deep foundation projects provided information on the methods and software currently employed. It was found that geotechnical engineers rely on static unit soil resistance equations that were developed over twenty years ago and that have a relatively large degree of empiricism. Updated and improved static design equations recently proposed in the literature have not yet been implemented in practice. Pile design relies predominantly on SPT data; cone penetration testing is performed only occasionally. Dynamic analysis of pile driving in standard practice is performed using Smith-type soil reaction models. A comprehensive review of existing soil reaction models for 1-dimensional dynamic pile analysis is presented. This review allowed an assessment of the validity of existing models and identification of their limitations. New shaft and base reaction models are developed that overcome shortcomings of existing models and that are consistent with the physics and mechanics of pile driving.
Model Uncertainties In Foundation Design
DOWNLOAD
Author : Chong Tang
language : en
Publisher: CRC Press
Release Date : 2021-03-16
Model Uncertainties In Foundation Design written by Chong Tang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-16 with Technology & Engineering categories.
Model Uncertainties in Foundation Design is unique in the compilation of the largest and the most diverse load test databases to date, covering many foundation types (shallow foundations, spudcans, driven piles, drilled shafts, rock sockets and helical piles) and a wide range of ground conditions (soil to soft rock). All databases with names prefixed by NUS are available upon request. This book presents a comprehensive evaluation of the model factor mean (bias) and coefficient of variation (COV) for ultimate and serviceability limit state based on these databases. These statistics can be used directly for AASHTO LRFD calibration. Besides load test databases, performance databases for other geo-structures and their model factor statistics are provided. Based on this extensive literature survey, a practical three-tier scheme for classifying the model uncertainty of geo-structures according to the model factor mean and COV is proposed. This empirically grounded scheme can underpin the calibration of resistance factors as a function of the degree of understanding – a concept already adopted in the Canadian Highway Bridge Design Code and being considered for the new draft for Eurocode 7 Part 1 (EN 1997-1:202x). The helical pile research in Chapter 7 was recognised by the 2020 ASCE Norman Medal.
Design Of Axially Loaded Piles European Practice
DOWNLOAD
Author : F. De Cock
language : en
Publisher: CRC Press
Release Date : 2020-12-17
Design Of Axially Loaded Piles European Practice written by F. De Cock and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-17 with History categories.
This book is unique on the subject because it is not so much a collection of individual work, but basically comprising national reports from most European countries on the present-day design methods, as prescribed in more or less strict national codes or recommendations and so daily used in practice by consulting engineers and contractors. As far as already implemented, the application of these methods within the framework of Eurocode 7 is described as well. In order to improve the understanding of the design methods, the national papers also consider aspects such as the local piling practice, limitations of the design methods, some practical examples and particular national experiences. The proceedings also include the contributions of two invited speakers as well as those of the three session discussion leaders, focusing on some particular aspects with regards to pile design. The book is of particular interest for those who are involved with pile design in practice, consulting engineers, piling contractors, control organisms as well as those dealing with geotechnical normalisation and research work.
Use Of Pile Driving Analysis For Assessment Of Axial Load Capacity Of Piles
DOWNLOAD
Author : Rodrigo Salgado
language : en
Publisher: Purdue University Press
Release Date : 2012-12-01
Use Of Pile Driving Analysis For Assessment Of Axial Load Capacity Of Piles written by Rodrigo Salgado and has been published by Purdue University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-01 with Transportation categories.
Driven piles are commonly used in foundation engineering. Pile driving formulae, which directly relate the pile set per blow to the capacity of the pile, are commonly used to decide whether an installed pile will have the designed capacity. However, existing formulae have been proposed based on empirical observations and have not been validated scientifically, so some might over-predict pile capacity, while others may be too conservative. In this report, a more advanced and realistic model developed at Purdue University for dynamic pile driving analysis was used to develop more accurate pile driving formulae. These formulae are derived for piles installed in typical soil profiles: a floating pile in sand, an end-bearing pile in sand, a floating pile in clay, an end-bearing pile in clay and a pile crossing a normally consolidated clay layer and resting on a dense sand layer. The proposed driving formulae are validated through well documented case histories of driven piles. Comparison of the predictions from the proposed formulae with the results from static load tests, dynamic load tests and conventional formulae show that they produce reasonably accurate predictions of pile capacity based on pile set observations.
Elastic Analysis Of Axial Load Displacement Behavior Of Single Driven Piles
DOWNLOAD
Author : Cem Akgüner
language : en
Publisher:
Release Date : 2007
Elastic Analysis Of Axial Load Displacement Behavior Of Single Driven Piles written by Cem Akgüner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Axial loads categories.
Deep foundations are commonly recommended when large displacements are expected. Typically, though, their design involves only checking and providing for sufficient capacity to carry the applied loads. Load-displacement behavior of piles is considered secondary to the axial capacity; displacements are ordinarily overlooked or not calculated if and when the estimated pile capacity is two to three times the design or expected loading. However, in cases, such as long piles or piles in dense cohesionless soils, displacements can be the critical factor in design or it could be a structural requirement to limit the displacements. In this dissertation, the displacements of axially loaded single piles are investigated by conducting analyses with the aid of an approach based on elasticity. The original solution predicting displacements due to a vertical load within a semi-infinite soil mass has been modified for varying soil conditions and layering, and assumptions of stresses and displacements acting on the soil-pile interface. Aside from the available/known factors of the pile (length, diameter, cross-sectional area, etc.) and the layering of the surrounding soil, Young's modulus and Poisson's ratio of the soil encompassing a pile are the unknowns required as input to obtain predictions based on the elastic method. In this study, attention is directed towards determining Young's modulus because the range and variability of Poisson's ratio is not significant in displacement calculations. Axial pile load testing data were provided by the California Department of Transportation as part of a project to improve its general approach to pile design. All of the tested piles were driven into the ground. Measurements of displacements and loads were made only at the top of the pile. Supplementary in-situ testing involving cone penetration (CPT) and standard penetration (SPT), drilling, and sample collection, were conducted in addition to laboratory testing to enhance the available information. In this research, predicted displacements are compared with those deduced from pile load tests. Two sets of predictions based on elastic method are conducted for comparing displacements. First, various correlations for Young's modulus are employed to determine how accurately each predicts the actual measured displacement. The chosen correlations utilize laboratory triaxial undrained shear strength and standard penetration test blowcount for cohesive and cohesionless soils, respectively. Secondly, the same data are also utilized to obtain back-calculated values of Young's moduli for analyses involving the elastic method. The measured displacements at loads of a third, a half, twothirds, and equal to the failure load were matched iteratively. Results from this research are deemed to have an impact on engineering practice by improving the determination of Young's modulus for displacement analyses involving the elastic method. A unique approach that has potential is the reconciliation of load ratios (percentage of failure load) with displacement calculations to provide a better overview of the range of load ratios for which these newly formulated correlations may be employed. Through this research, it is anticipated that better determination of soil parameters for elastic analysis of axial pile displacements can be made by researchers and engineers alike.
Load Transfer Criteria For Numerical Analysis Of Axially Loaded Piles In Sand Part 1 Load Transfer Criteria
DOWNLOAD
Author : R. L. Mosher
language : en
Publisher:
Release Date : 1984
Load Transfer Criteria For Numerical Analysis Of Axially Loaded Piles In Sand Part 1 Load Transfer Criteria written by R. L. Mosher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
Part I describes a study of load-transfer criteria for analysis of axially loaded piles in sand using the discrete springs soil model. Various analysis methods for axially loaded piles are presented, along with a literature review of pile behavior in sands focusing on the changes the soil undergoes during pile installation. Available criteria for spring representation of soil are presented and summarized. The criteria are compated with actual field data from pile load tests and are critically evaluated based on these comparisons. Because of the poor performance of the available criteria, new criteria are proposed. The new criteria use maximum side and tip resistance values presented by Castello (1980). Castello's values are modified by the author to reflect the field data from the Lower Mississippi Valley. Displacement functions for side and tip resistance are developed based on correlations with field data for pile load tests. The new criteria are evaluated against pile load test data. Use of the critieria is demonstrated in an outline of an analysis. The new criteria are used to develop a set of design curves for the practicing engineer. Part II of this report is published under a separate cover, and presents load capacity curves for select steel and concrete pile.
Load Transfer Criteria For Numerical Analysis Of Axially Loaded Piles In Sand Part 2 Load Pile Capacity Curves For Steel And Concrete Piles
DOWNLOAD
Author : R. L. Mosher
language : en
Publisher:
Release Date : 1984
Load Transfer Criteria For Numerical Analysis Of Axially Loaded Piles In Sand Part 2 Load Pile Capacity Curves For Steel And Concrete Piles written by R. L. Mosher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
This report presents load capacity curves for the design and analysis of axially loaded piles. A brief discussion of the contents of this report and the applicability of the curves follows. In order to make intelligent use of these curves, the reader should have a through knowledge of the criteria used in their development. These criteria are presented in Part I of this report.
Design Of Axially Loaded Piles European Practice
DOWNLOAD
Author : C. Legrand
language : en
Publisher:
Release Date : 1997
Design Of Axially Loaded Piles European Practice written by C. Legrand and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Piling (Civil engineering) categories.
Pile Driving Analysis For Pile Design And Quality Assurance
DOWNLOAD
Author : Rodrigo Salgado
language : en
Publisher:
Release Date : 2018-02
Pile Driving Analysis For Pile Design And Quality Assurance written by Rodrigo Salgado and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02 with categories.
Driven piles are commonly used in foundation engineering. The most accurate measurement of pile capacity is achieved from measurements made during static load tests. Static load tests, however, may be too expensive for certain projects. In these cases, indirect estimates of the pile capacity can be made through dynamic measurements. These estimates can be performed either through pile driving formulae or through analytical methods, such as the Case method.Pile driving formulae, which relate the pile set per blow to the capacity of the pile, are frequently used to determine whether the pile has achieved its design capacity. However, existing formulae have numerous shortcomings. These formulae are based on empirical observations and lack scientific validation. This report details the development of more accurate and reliable pile driving formulae developed from advanced one-dimensional FE simulations. These formulae are derived for piles installed in five typical soil profiles: a floating pile in sand, an end¿bearing pile in sand, a floating pile in clay, an end¿bearing pile in clay and a pile crossing a normally consolidated clay layer and resting on a dense sand layer. The proposed driving formulae are validated through well-documented case histories of full-scale instrumented driven piles. The proposed formulae are more accurate and reliable on average than other existing methods for the case histories considered in this study.This report also discusses the development of a pile driving control system, a fully integrated system developed by Purdue that can be used to collect, process, and analyze data to estimate the capacities of piles using the Case method and the pile driving formulae developed at Purdue.
Centrifuge Modeling And Large Deformation Analyses Of Axially Loaded Helical Piles In Cohesive Soils
DOWNLOAD
Author : Weidong Li
language : en
Publisher:
Release Date : 2022
Centrifuge Modeling And Large Deformation Analyses Of Axially Loaded Helical Piles In Cohesive Soils written by Weidong Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Anchorage (Structural engineering) categories.
In the past decades, helical piles have gained increasing popularity in civil engineering practice as an option of deep foundations. The design of axial load capacity of these piles relies on an appropriate selection of failure mode. Currently, the axial failure modes of multi-helix piles are categorized into the individual bearing mode (IBM) and cylindrical shearing mode (CSM). The ratio (Sr) of inter-helix spacing to helix diameter is used as the primary indicator of failure mode. The industry adopts Sr of 3.0 as the only criteria, but a number of field tests indicate that the soil strength and pile embedment depth may also affect the failure mode. However, a comprehensive study aimed at all these factors is unavailable yet. To improve our understanding of the axial behavior of helical piles in cohesive soils, a centrifuge modeling test program for helical piles was conducted. A test frame was developed to install and axially load helical piles in flight. The real-time installation torque and axial shaft load distributions were measured. One single-helix pile and three double-helix piles with Sr varied from 1.5 to 3.5 were tested in two types of kaolinite clay with undrained shear strength (su) of approximately 50 kPa (denoted as "medium stiff clay" in this thesis) and 120 kPa ("stiff clay"), respectively. Each model pile was installed and axially loaded under 20 g centrifugal condition. Specifically, the research was aimed at pile installation torque, installation-induced excess pore pressure in the soil, and pile failure mechanisms under monotonic axial loads. An analytical solution to the installation torque of helical piles in cohesive soils was proposed and verified by measured torques. The analysis indicates that the residual su of the soil governs the soil-pile interactions during rotation. The pore pressure response to pile installation was monitored near two piles at two depths, in the stiff clay. An analytical solution to pile installation-induced spatial consolidation was adopted to assess the measured progression of excess pore pressure dissipation.iii To observe the failure modes, the model piles were pulled out of the soil immediately after loading. Three failure modes were observed, i.e., IBM, CSM and a transitional failure mode (TFM) with a cone-shaped inter-helix soil mass. The axial load transfer mechanisms of the tested piles were assessed using the axial load distribution measurements. The results show that IBM and CSM models may over-predict the axial capacity of a helical pile governed by TFM. In addition, the failure modes depend on su and Sr. To further explore the axial failure mechanisms of the double-helix piles in a wider range of controlling factors, finite element modeling of helical piles in cohesive soils was conducted. Because of the large displacement required for pile failure observation, large deformation finite element (LDFE) analyses based on the remeshing and interpolation technique with small strain were performed. The LDFE model was validated by the centrifuge model test results. The effects of Sr, su, and pile embedment depth on the generation of failure mode were assessed. The simulation results show that the failure mode changes gradually from CSM to IBM with an increasing inter-helix spacing. CSM occurs when Sr is adequately small, and su of the clay is sufficiently high. In general, CSM provide greater optimal uplift capacity as Sr increases. However, when Sr approaches 2.5, using CSM for axial capacity design may become inaccurate. The helix break-out factors of lower helices, which may be affected by the above inter-helix soil collapse mechanisms, change with the failure modes. The bearing factors of the lower helices, which may not be affected by the inter-helix soil behavior, remain essentially unchanged with the variation of failure modes.