Download or read book Use of Pile Driving Analysis for Assessment of Axial Load Capacity of Piles written by Rodrigo Salgado and published by Purdue University Press. This book was released on 2012-12-01 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Predicted and Observed Axial Behavior of Piles results of a Pile Prediction Symposium written by Richard J. Finno and published by . This book was released on 1989 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a symposium sponsored by the Geotechnical Engineering Division. Geotechnical Special Publication No. 23.

Download or read book Pile Driving Analysis for Pile Design and Quality Assurance written by Rodrigo Salgado and published by . This book was released on 2018-02 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Application of Stress wave Theory to Piles written by Jaime Alberto dos Santos and published by IOS Press. This book was released on 2008 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume contains 101 papers presented at the 8th International Conference on the Application of Stress Wave Theory to Piles, held in Lisbon, Portugal in 2008." "It is divided in 14 chapters according to the conference themes: Wave mechanics applied to pile engineering; Relationship between static resistance to driving and long-term static soil resistance; Case histories involving measurementand analysis of stress waves; Dynamic monitoring of driven piles; Dynamic soil-pile interaction models - numerical and physical modeling; High-strain dynamic test; Low-strain dynamic test; Rapid-load test; Monitoring and analysis of vibratory driven piles; Correlation of dynamic and static load tests; Quality assurance of deep foundations using dynamic methods; Incorporation of dynamic testing into design codes and testing standards; Ground vibrations induced by pile motions; Dynamic measurements in ground field testing." "This conference aims to contribute to a better and more efficient professional interaction between specialized contractors, designers and academicians. By joining the contribution of all of them it was possible to elucidate the today's state-of-the-art in science, technology and practice in the application of stress wave theory to piles."--BOOK JACKET.

Download or read book Axial Load Tests and Analysis for Open ended Steel Tubular Piles Driven Into Weathered Rock written by Yi Han and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bearing capacity of tubular, open-ended steel piles driving into weathered rock was investigated using static load tests, finite element analysis and dynamic load tests. Dynamic load tests were carried out by using the Case Method and the CAPWAP Method which were used to determine the bearing capacity of piles. The effects of final set, pile burial length, setup and other factors on the pile bearing capacity were evaluated. In the static load tests, two piles with 0.813 m diameter and one pile with a diameter of 1.0 m were tested. The finite element analysis was performed to back calculate the load-displacement response of piles. A hyperbolic model for soils and an elastic-plastic model for rocks were used in the study. A parametric study was also carried out. The issues, such as the effects of pile installation and soil plug, were discussed.

Download or read book Application of Stress Wave Theory to Piles Quality Assurance on Land and Offshore Piling written by J. Beim and published by CRC Press. This book was released on 2000-01-01 with total page 791 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work collates the topics discussed in the sixth International Conference on land and offshore piling. It covers topics such as: wave mechanics and its application to pile mechanics; driving equipment and developments; and pile integrity and low strain dynamic testing.

Download or read book A Study of Capacity Predictions for Driven Piles by Dynamic Pile Testing written by Man-Kie Wong and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "A Study of Capacity Predictions for Driven Piles by Dynamic Pile Testing" by Man-kie, Wong, 黃文基, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled A Study of Capacity Predictions for Driven Piles by Dynamic Pile Testing submitted by Wong Man Kie for the degree of Doctor of Philosophy at the University of Hong Kong October 2006 The ban on the use of diesel hammers for percussive piling works and the introduction of hydraulic hammers in Hong Kong in the mid-1990s have brought unsettling times for the local construction industry. In recent years it has not been unusual to find that the measured set and the temporary compression of piles at final set are beyond the range of the set table of the Hiley Formula. A lack of local expertise in using hydraulic hammers and the absence of an approved pile-driving criterion specifically for the use of this new tool are to blame. Some engineers have responded by imposing more stringent requirements on the pile capacity acceptance test than may be necessary, resulting in over-driven piles and associated damage. To resolve such problems, a pile-driving criterion that is practical and generally applicable to all types of piles is called for. Findings from extensive research overseas has established the general value of Dynamic Pile Testing in assessing pile capacity. Such testing involves the combined use of data collected by Pile Driving Analyzer (PDA) and the analytical tool known as Case Pile Wave Analysis Program (CAPWAP). In Hong Kong, there is considerable scope for the wider use of Dynamic Pile Testing. This thesis reports the results of an in-depth study undertaken to confirm the suitability and potential benefits of such testing under local soil conditions. The test piles selected for this study are those typically used locally. A total of 420 Grade 55C steel H-piles driven by hydraulic hammers between 2002 and 2005 were selected from 22 different projects across the territory with different sub-soil conditions. Between 20m and 60m in length, the test piles are representative of the range commonly found in local construction projects. The results from static load tests were used in this study as a benchmark, and compared to the pile capacity predictions derived from several tools (PDA, CAPWAP, the Hiley Formula and the Modified Hiley Formula) with a view to recommending a reliable and practical method for assessing pile capacity. The study results demonstrated that the CAPWAP method can predict the Davisson limit load accurately. Despite the strong predictive power of CAPWAP analysis, we need for field control purposes a dynamic formula that is reliable and yet more practicable in terms of time and cost. The results of the study show that by calibrating the Hiley Formula with the efficiency of the hammer drop, E, and the coefficient of restitution of the hammer cushion, e, derived from CAPWAP analyses, pile capacity predictions can be made that are close to the CAPWAP predictions and the static load test results. To conclude, the present study has clearly established that PDA, CAPWAP and the "calibrated" Hiley Formula are effective tools for pile capacity assessment and quality control of piling works in Hong Kong. Cost-effective and practical, their combined use would contribute significantly to the overall quality and efficiency of pile driving, thus inducing greater confidence locally in Dynamic Pile Testing. DOI: 10.5353/th_b3710612 Subjects: Piling (Civil engineering) - Testing

Download or read book Development of Resistance Factors for Axial Capacity of Driven Piles in North Carolina written by Kyung Jun Kim and published by . This book was released on 2002 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: pile bearing capacity, load and resistance factor design, Vesic, Nordlund, Meyerhof, reliability analysis, FORM, MVFOSM, AFOSM, resistance factor calibration, pile driving analyzer, static load test, bias factor.

Download or read book Application of Stress Wave Theory to Piles Test Results written by Frans B.J. Barends and published by CRC Press. This book was released on 2021-04-29 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the Pile Testing Research Project, and covers most of the results. Topics include: general soil conditions of the test site; pile integrity tests; pile driving prediction contest; pile driving demonstration; and vibratory pile driving techniques.

Download or read book Dynamic Pile Testing Technology written by Robert Y. Liang and published by . This book was released on 2007 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven piles are widely used as foundations to support buildings, bridges, and other structures. In 2007, AASHTO has adopted LRFD method for foundation design. The probability based LRFD approach affords the mathematical framework from which significant improvements on the design and quality control of driven piles can be achieved. In this research, reliability-based quality control criteria for driven piles are developed based on the framework of acceptance-sampling analysis for both static and dynamic test methods with the lognormal distribution characteristics. As a result, an optimum approach is suggested for the number of load tests and the required measured capacities for quality control of driven piles. Furthermore, this research has compiled a large database of pile set-up, from which the reliability-based approach of FORM is employed to develop separate resistance factors for the measured reference (initial) capacity and predicted set-up capacity. This report also provides a Bayesian theory based approach to allow for combining the information from the static pile capacity calculation and dynamic pile testing data to improve pile design process. Specifically, the results from dynamic pile tests can be utilized to reduce the uncertainties associated with static analysis methods of pile capacity by updating the corresponding resistance factors. This research has also developed one-dimensional wave equation based algorithm to interpret the High Strain Testing (HST) data for the estimation of the shaft and toe resistance of driven piles. The closed form solution is obtained for determining the Smith damping factor and the static soil resistance. Finally, a set of new wireless dynamic testing equipment (both hardware and software) is developed for more efficient dynamic pile testing.

Download or read book Developing Production Pile Driving Criteria from Test Pile Data written by Dan A. Brown and published by Transportation Research Board. This book was released on 2011 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 418: Developing Production Pile Driving Criteria from Test Pile Data provides information on the current practices used by state transportation agencies to develop pile driving criteria, with special attention paid to the use of test pile data in the process.

Download or read book Assessment of Axially Loaded Pile Dynamic Design Methods and Review of Indot Axially Loaded Pile Design Procedure written by Dimitrios Loukidis and published by Purdue University Press. This book was released on 2008-03-01 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Elastic Analysis of Axial Load displacement Behavior of Single Driven Piles written by Cem Akgüner and published by . This book was released on 2007 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Development of Guidelines for Construction Control of Pile Driving and Estimation of Pile Capacity written by Richard J. Fragaszy and published by . This book was released on 1985 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Postgraduate Course on Analysis and Design of Pile Foundations written by University of Sydney. School of Civil Engineering and published by . This book was released on 1972 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pile Driving and Loading Tests written by and published by . This book was released on 1964 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rapid Load Testing on Piles written by Paul Holscher and published by CRC Press. This book was released on 2011-10-14 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Rapid Load Test (RLT), developed to determine the initial stiffness and bearing capacity, is an economical and practical alternative to a Static Load Test (SLT). The broad application of RLT, however, was hampered by uncertainty about the interpretation of the test results. This book offers clear guidance on the available analysis techniques and their reliability. The guidelines were related to an international standard that is drawn up by CEN and can be used in two ways: Straightforward interpretation of test results, chapters 1-3 Interpretation with additional background information about the possibilities and limitations, chapters 4-8 The guidelines were drawn up by the Dutch CUR-committee on rapid load testing on piles. Chapters 1 and 2 deal with the practical execution of the test and the presentation of the results. Chapter 3 gives a general overview of existing interpretation methods and refers to step-by-step descriptions of the two advised interpretation methods. The aspects that are important for the interpretation are discussed in chapter 4, also showing that the inertia of the pile should be taken into account. In clay soil the rate effect (the dependency of strength and stiffness on loading rate) is also of importance, whereas in sand and silt the generation of pore water pressures during an RLT plays a role. The velocity of the RLT is such that the reaction of sand and silt might be considered as partially drained. These guidelines indicate how these effects can be compensated to obtain the static resistance in the final results. Chapter 5 presents two interpretation methods (a method for piles in sand, gravel, silt and piles on rock and a method for piles in clay). For practical use, the methods are described in a step-by-step scheme in an appendix.