Development Of An Acip Pile Specific Load Displacement Model

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Development Of An Acip Pile Specific Load Displacement Model

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Author : Nasim Adami
language : en
Publisher:
Release Date : 2013

Development Of An Acip Pile Specific Load Displacement Model written by Nasim Adami and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Concrete piling categories.

Augered cast-in-place piles, also known as ACIP piles, have been used for more than seven decades in the United States and have gained in popularity due to their relatively quick installation and cost-effectiveness. Owing to the reduced impact on the neighboring environment as compared to some other deep foundation installation methods, ACIP piles are appropriate for use in urban areas. Although there has been an increase in application of ACIP piles, relatively little research on this type of pile has been performed as compared to similar deep foundations, such as drilled shafts. The insufficient experimental work on ACIP pile behavior and lack of ACIP pile specific load- displacement models have led practicing engineers to use the results and methodologies from drilled shafts. An example of this is the use of t-z and q-z based load transfer models from drilled shaft-specific relationships to estimate the load-displacement behavior of ACIP piles. Such applications can result in an underestimation of shaft resistance and consequently disagreement between the predicted and measured load-displacement behavior of the ACIP piles. This thesis evaluates the ability of currently used load-displacement models to estimate the measured load-displacement behavior of ACIP piles. Also, a new empirically-based ACIP pile-specific t-z model is proposed that, in combination with the O'Neill and Reese (1999) q-z model and ACIP pile-specific toe bearing resistance model, forms an ACIP pile specific load-displacement model. Experiments of instrumented ACIP piles installed in the granular soils of Western Washington were used to develop the ACIP pile specific t-z model. Comparison between the results from the currently used load-displacement models with the proposed model showed that the proposed model provides an improvement in the prediction of the load-displacement behavior of ACIP piles. Finally, an analysis of variability is performed using the Monte Carlo Simulation with the sample probability distributions of the uncertain variables in load-displacement model. These analyses result in provide a set of possible loads for a number of common service level displacements, which are reported as cumulative density function (CDF) curves. The CDF curves for loads corresponding to a displacement considered can be a useful tool in design procedure of ACIP piles.

Load Displacement Behavior Of Acip Piles In Very Dense Sand And Hard Clay

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Author : Onur Güvener
language : en
Publisher:
Release Date : 2006

Load Displacement Behavior Of Acip Piles In Very Dense Sand And Hard Clay written by Onur Güvener and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Clay soils categories.

Load Displacement Behavior Of Acip Piles In Soils And Socketed In Clay Shale

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Author : Swapnil Kaulgud
language : en
Publisher:
Release Date : 2004

Load Displacement Behavior Of Acip Piles In Soils And Socketed In Clay Shale written by Swapnil Kaulgud and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Piling (Civil engineering) categories.

Advances In Deep Foundations

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Author : Yoshiaki Kikuchi
language : en
Publisher: Taylor & Francis
Release Date : 2007-06-21

Advances In Deep Foundations written by Yoshiaki Kikuchi and has been published by Taylor & Francis this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-06-21 with Technology & Engineering categories.

Civil Engineering has recently seen enormous progress in the core field of the construction of deep foundations. This book is the result of the International Workshop on Recent Advances in Deep Foundations (IWDPF07), which was held in Yokosuka, Japan from the 1st to the 2nd of February, 2007. Topics under discussion in this book include recent rese

Model Uncertainties In Foundation Design

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Author : Chong Tang
language : en
Publisher: CRC Press
Release Date : 2021-03-17

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 2021-03-17 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.

Geotechnical Engineering For Disaster Mitigation And Rehabilitation

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Author : Han-Long Liu
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-02-18

Geotechnical Engineering For Disaster Mitigation And Rehabilitation written by Han-Long Liu and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-02-18 with Science categories.

"Geotechnical Engineering for Disaster Mitigation and Rehabilitation" presents the latest developments and case studies in the field. All contributions to this proceedings were rigorously reviewed to cover the newest developments in disasters related to earthquakes, landslides and slopes, soil dynamics, risk assessment and management, disaster mitigation and rehabilitation, and others. The book will be a useful reference for geotechnical scientists, engineers and professionals in these areas.

Geotechnical Engineering Circular Gec No 8

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Author : Dan A. Brown,, Dan ABrown , P.E.
language : en
Publisher:
Release Date : 2007-04-02

Geotechnical Engineering Circular Gec No 8 written by Dan A. Brown,, Dan ABrown , P.E. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-04-02 with categories.

The purpose of this document is to develop a state-of-the-practice manual for the design and construction of continuous flight auger (CFA) piles, including those piles commonly referred to as augered cast-in-place (ACIP) piles, drilled displacement (DD) piles, and screw piles. An Allowable Stress Design (ASD) procedure is presented in this document as resistance (strength reduction) factors have not yet been calibrated for CFA piles for a Load Resistance Factored Design (LRFD) approach. The intended audience for this document is engineers and construction specialists involved in the design, construction, and contracting of foundation elements for transportation structures. CFA piles have been used in the U.S. commercial market but have not been used frequently for support of transportation structures in the United States. This underutilization of a viable technology is a result of perceived difficulties in quality control, and the difficulties associated with incorporating a rapidly developing (and often proprietary) technology into the traditional, prescriptive design-bid-build concept. Recent advances in automated monitoring and recording devices will alleviate concerns of quality control, as well as provide an essential tool for a performance-based contracting process. This document provides descriptions of the basic mechanisms involving CFA piles, CFA pile types, applications for transportation projects, common materials, construction equipment, and procedures used in this technology. Recommendations are made for methods to estimate the static axial capacity of single piles. A thorough evaluation and comparison of various existing methods used in the United States and Europe is also presented. Group effects for axial capacity and settlement are discussed, as well as lateral load capacities for both single piles and pile groups. A generalized step-by-step method for the selection and design of CFA piles is presented. Quality control (QC)/quality assurance (QA) procedures are discussed, and a performance specification is provided. This generic specification may be adapted to specific project requirements. A list of the references used in the development of this manual is presented. These references include the key publications on the design of augered pile foundations. Existing Federal Highway Administration (FWHA) and American Association of State Highway Officials (AASHTO) publications that include engineering principles related to the subject of CFA piles are also included in the references.

Characterization Of T Z Model Design Parameters For Augered Cast In Place Piles Using Field Load Test Data

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Author : Bradley Scott Gardner
language : en
Publisher:
Release Date : 2012

Characterization Of T Z Model Design Parameters For Augered Cast In Place Piles Using Field Load Test Data written by Bradley Scott Gardner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Concrete piling categories.

With the increasing use of augered cast-in-place piles in new construction, it is important that proper design parameters be incorporated when evaluating pile capacity and performance using reliability-based design methods. This paper focuses on developing "t-z" model parameters from analysis of static axial compression and tension load test data from a project site along the Missouri River floodplain in northwest Missouri. Data was collected from a total of twelve axial load tests (six compression and six tension) and includes dial gauge readings from the pile heads as well as vibrating wire strain gauge data from multiple locations throughout several of the test piles. The "t-z" method has been used extensively as a soil-structure interaction model to evaluate the settlement of deep foundations. The soil-structure interaction modeled in this analysis was based on hyperbolic load displacement behavior using effective (drained) stresses. The development of the "t-z" model parameters has been accomplished using finite difference methods to analyze the non-linear soil-structure interaction along the sides of the piles. During the analysis, the mean shear modulus of soil-structure interface subgrade reaction, K[sub]init, and the mean ultimate shear strength of the soil-structure interface, [symbol for tau][sub]u, were back-calculated from each set of load test data and were based on the assumption of a single-layer, homogenous soil profile. These "t-z" model parameters were then compared to standard field investigation data, including standard penetration tests (SPT) and cone penetrometer test (CPT) soundings, and effective overburden stress to develop correlations suitable for service limit state design of augered cast-in-place piles. While there was some indication of a linear relationship between K[sub]init and the field investigation data, there was not a sufficient quantity of data in the analysis to properly identify any statistical trends. The relationship between [symbol for tau][sub]u and the field investigation data was much more variable and did not provide any distinct correlation. The plot of the data relating the model parameters to the effective overburden stress exhibited some grouping but the sample size and distribution was not sufficient to identify any statistical trends.

Foundation Analysis And Design

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Author : Robert L. Parsons
language : en
Publisher:
Release Date : 2006

Foundation Analysis And Design written by Robert L. Parsons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Electronic books categories.

Foundation Analysis and Design: Innovative Methods covers recent advances in the research and construction of shallow foundations, pile foundations and limit state design. This Geotechnical Special Publication contains 44 technical papers that were presented at the GeoShanghai Conference held in Shanghai, China from June 6-8, 2006. The book begins with a keynote paper by Professor Harry Poulos, which summarizes recent advances in the settlement of pile groups. The next section contains fifteen papers which address statistical applications and the use of limit state design for foundations. The third section contains 25 papers on deep foundations that describe a series of advances in the estimation of pile capacity and pile installation issues. The final section includes three papers that focus on advances in the estimation of settlement associated with shallow foundations.

Soils And Geotechnology In Construction

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Author : Alan J. Lutenegger
language : en
Publisher: CRC Press
Release Date : 2019-05-03

Soils And Geotechnology In Construction written by Alan J. Lutenegger and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-03 with Technology & Engineering categories.

This book covers the field of applied geotechnology related to all aspects of construction in ground, including compacted fill, excavations, ground improvement, foundations, earth retaining systems and geotechnical site characterization. It suits the first year of a graduate course on ground improvement and geoconstruction and will suit practicing engineers, both consultants and contractors. Distinctively it covers the identification of problematic soils and appropriate mitigation measures, and the inspection of ground construction work. It combines the technical and the practical in applied geotechnology.