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 A Study of Capacity Predictions for Driven Piles by Dynamic Pile Testing written by 黃文基 and published by . This book was released on 2006 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Implementation of New Driven Pile Technology written by Robert Y. Liang and published by . This book was released on 1999 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven piles have been frequently used by highway engineers to support bridges, retaining walls, and overhead signs. Prior to pile driving, engineers need to estimate the required pile length based on soil information and soil mechanics principles. During pile driving, engineers need to verify the load-carrying capacity and integrity of each driven pile. The analysis tools for pile length estimation and dynamic pile testing techniques for pile-driving control constitute the two main focuses of this research.

Download or read book Pile Capacity Predictions Using Static and Dynamic Load Testing written by Ahmad Amr Darrag and published by . This book was released on 1987 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Recommendations regarding the most reliable and economical load test methods needed by highway agencies for the design and control of bridge piles are introduced"--Abstract.

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 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 Estimation of Pile Capacity by Optimizing Dynamic Pile Driving Formulae written by Awais Rauf and published by . This book was released on 2012 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piles have been used since prehistoric times in areas with weak subsurface conditions either to reinforce existing ground, create new ground for habitation or trade, and support bridges and buildings. Originally piles were composed of timber and driven with drop hammers using very heavy ram weights. As technology improved so did the materials that piles are composed of as well as the equipment itself. Currently, piling is a multibillion dollar a year industry, thus the need to develop more accurate prediction methods can potentially represent a significant savings in cost, material, and man power. Multiple predictive methods have been developed to estimate developed pile capacity. These range from static theoretical formulae based on geotechnical investigation prior to pile driving even occurring using specific pile and hammer types to semi empirically based dynamic formulae used during actual driving operations to more recently developed computer modeling and signal matching programs which are calibrated with site condition during initial geotechnical investigations or test piling to full scale static load tests where piles are loaded to some predetermined value or failure condition. In this thesis, dynamic formulae are used to predict pile capacity from those installed by drop and diesel hammers and are compared to the results from pile load tests, which are taken as the true measure of developed bearing capacity. The dynamic formulae examined are the Engineering News Record (ENR), Gates, Federal Highway Administration (FHWA) modified Gates, Hiley, and Ontario Ministry of Transportation (MTO) modified Hiley formulae. Methods of investigation include calculating pile capacities from the formulae as they are, omitting the factors of safety, revising the formulae with averaged coefficients and conducting multi regression analysis to solve for one or two coefficients simultaneously and revising the dynamic formula to determine if more accurate bearing capacity predictions are possible. To objectively determine which formulae provide the most accurate bearing capacities, the predicted capacities will be compared to results obtained from static pile load tests and simple statistics on the resulting data set will be calculated including regression analysis, standard deviations, coefficients of variation, coefficients of determination, and correlation values.

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 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 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 Axial Bearing Capacity Of Driven Piles written by Ehsan Momeni and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proper estimation of axial bearing capacity of driven piles plays a significant role in pile design. There are numerous methods for prediction the axial bearing capacity of driven piles such as analytical methods, empirical methods, pile load test, High Strain Dynamic Testing of Piles (HSDPT), and finite element method. This Book gives insight into the aforementioned methods for estimation of pile axial capacity. The book presents a numerical technique for prediction the skin resistance distribution with depth. This book is a useful source for both undergraduate and postgraduate students in Civil and Geotechnical Engineering.

Download or read book Bearing Capacity of Driven Piles in Sand written by Reno Reine Castello and published by . This book was released on 1979 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparison of Pile Loading Test Results of Instrumented Frictional H piles with Predictions from Classical Theory of Pile Capacity Equations written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: (Uncorrected OCR) Abstract A study has been carried out to compare predictions of different equations based on classical theory of capacity of friction piles with the results from static loading tests on instrumented piles. The objective of the study was to verify the validity of the pile capacity equations commonly used in Hong Kong. The test data was used only for reference in the exercise of calculation of pile capacity from different classical theory. Therefore the findings of this study are considered to be of limited nature and not intended to be generalized. The load test results were compared with the pile capacity calculated from the theory as outlined in the following literature: 1 Pile Design and Construction by GEO (1997) 2 Canadian Foundation Engineering Manual (3rd Edition, 1992) 3 Pile Foundation Analysis and Design by Poulos and Davis (1980) 4 Pile Design and Construction Practice by Tomlinson (3rd Edition, 1987) It was concluded that the suggestion from "Pile Design and Construction by GEO (1997)" produced the closest calculated value as compared to the pile test results, whereas the others significantly underestimated the bearing capacity of the Grade 55 305x305x223kg/m H-pile driven into medium to dense granite saprolite. IV.

Download or read book Calibration of Resistance Factors for Driven Piles Using Static and Dynamic Tests written by Deshinka Arimena Bostwick and published by . This book was released on 2014 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of geotechnical engineering has evolved from Allowable Stress Design (ASD) to Load Factor and Resistance Design (LRFD) which has led to a need to quantify the measures of uncertainty and the level of reliability associated with a project. The measures of uncertainty are quantified by load and resistance factors, while the level of reliability is driven by the amount of risk an owner is willing to take and is quantified by the reliability index. The load factors are defined through structural design codes, but the resistance factors have uncertainties that can be mitigated through reliability based design. The American Association of State Highway and Transportation Officials (AASHTO) have recommended resistance factors that are dependent on the type of load tests conducted and are available as a reference to state agencies. The objective of this study was to improve the AASHTO recommended resistance factors used by the Arkansas State Highway and Transportation Department (AHTD), thereby, increasing allowable pile capacity and reducing deep foundation costs. Revised resistance factors for field acceptance based on dynamic testing were established through the analysis of pile load test data where both static and dynamic load testing was conducted. Pile load tests were separated by pile type and soil type. It was important that the load test data analyzed represented soil and geologic conditions similar to those found in Arkansas. The resistance factors determined from this analysis improved AHTD current practice, but indicated that the factors recommended by AASHTO may be unconservative for this region.

Download or read book Comparison of Measured Pile Capacity to Pile Capacity Predictions Made Using Electronic Cone Penetration Data written by Ronald L. Richman and published by . This book was released on 1989 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reliability based Design and Quality Control of Driven Piles written by Luo Yang and published by . This book was released on 2006 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Driven piles are widely used as foundations for buildings, bridges, and other structures. Since 1994, AASHTO (American Association of State Highway and Transportation Officials) has been in process to change from ASD (Allowable Stress Design) method to LRFD (Load and Resistance Factor Design) method for foundation design. The adoption of LRFD approach makes possible the application of reliability analysis to quantify uncertainties associated with various load and resistance components, respectively. Although there exist some recommendations for incorporation of set-up into ASD and quality control methods for driven piles, most of these recommendations were developed purely based on the engineering experience with no attendant database and reliability analysis. A successful application of probability approach will definitely result in significant improvements on the design and quality control of driven piles. Therefore, there is a need to develop the quality control criterion and to improve the LRFD of driven piles in the framework of reliability-based analysis. In this study, the new reliability-based quality control criteria on driven piles are developed based on acceptance-sampling analysis for various pile test methods with lognormal statistical characteristics. An optimum approach is recommended for the selection of the number of load tests and the required measured capacities for quality control of various load test methods of driven piles. The databases containing a large number of pile testing data are compiled for piles driven into clay and into sand, respectively. Based on the compiled databases, a new methodology is developed to incorporate set-up into the LRFD of drive piles using FORM (First Order Reliability Method) where the separate resistance factors for measured reference capacity and predicted set-up capacity are derived to account for different degrees of uncertainties associated with these two capacity components. Based on Bayesian theory, a new methodology is developed to optimize the LRFD of driven piles by combining the results from static calculation and dynamic pile testing. Specifically, the results from dynamic pile tests are incorporated to reduce the uncertainties associated with static analysis methods by updating the resistance factors in LRFD. Finally, a new one-dimensional wave equation based algorithm to interpret High Strain Testing data for estimation of resistances of driven piles is proposed."--abstract.

Download or read book Application of Stress wave Theory to Piles written by Frans B. J. Barends and published by Taylor & Francis. This book was released on 2022-06-03 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprising 97 papers on Geotechnical & environmental aspects (Pile-soil modelling, vibrations); Dynamic testing (Equipment & data acquisition systems); Performance during installation (Driving equipment, hammer-pile-soil system); Reliability of predictions (Theory versus experiment and simulation). Each part starts with a lecture by invited keynote speakers; followed by a general report on the papers. New themes considered are environmental aspects related to vibration and noise & the reliability of predictions emphasizing the validation of theoretical methods & practical experience.