July 7, 2010 robert thompson although i have known for several weeks that the manual was finished i work for one of the authors, after all. This federal highway administration fhwa began the development of the first version of the deep foundation load test database dlftd in the 1980s. The equivalent static load versus pile head axial displacement for the prestressed concrete and composite piles for the three cycles are shown in figure 92. Evaluation of fhwa pile design method against the fhwa deep. Recalling the driven pile and drilled shaft foundation construction equipment and construction inspection procedures description static load testing and recalling the basic skills needed to interpret static load test results. The estimated pile length necessary to provide the required nominal resistance is determined using static analysis, local pile. Blue book and to an approximate average load factor of 1. Comparison of five different methods for determining pile. Design and construction of driven pile foundations.
Design and construction of driven pile foundations idaho. Standard test methods for deep foundations under static. Fhwa 2006a design and construction of driven pile foundations vol. The long anticipated update to fhwa gec 10 drilled shafts.
Geotechnical engineers have been estimating pile capacity during the design phase of a project based on soil boring data, static analyses of pile capacity, and local experience for many years. The contractor must engage the services of a professional engineer licensed and registered in new york state, experienced in all aspects of pile load testing and acceptable to the deputy. As part of a bridge replacement project, a dynamic pile i. Although the manual reading and recording of dial gauges employed in a static loading test should present no insurmountable difficulty in terms of accuracy and regularity, it is the application of. Administrations design and construction of driven pile foundations fhwanhi05042 and 043. Federal highway a rulemaking manual us department of. Impact driven, untapered, steel and concrete piles, loaded in compression, using a static load test. The base of each pile was embedded slightly in a very dense. Users manual for laterally loaded pile analysis program for the microcomputer, com624p version 2. Each test pile was subjected to three loading cycles with an increasing magnitude of applied load. In order to use historical load test data, the characterized project site soilrock profile should be similar to the soilrock profile at the load test site.
Instrumented static load test on rocksocketed micropile. Department of transportation federal highway administration, publication nos. Code manuals and select published literature pis ridge design manual hapter 20 publication number m 2004 precast prestressed oncrete piles u. Two detailed design examples and a generic commentary guideline specification for micropiles is. Design and construction of driven pile foundationslessons learned on the central arterytunnel project publication no. Chapter 8 static pile load testing and pile dynamic. Pile load capacity calculation methods 85 case c is referred to as the alternative procedure in the note to en 19971 7. Fhwasa91042, static testing of deep foundations, provides the following recommendations on when to perform a pile load test.
Foundations manual were published 1985, 1996, and 2006 and chronical the many. Evaluation of fhwa pile design method against the fhwa. Federal highway administration rulemaking manual, july 2000 1 1. A test to verify design assumptions and the adequacy of the contractors installation methods. Recalling the driven pile and drilled shaft foundation construction equipment and construction inspection procedures description static load testing and recalling the basic skills needed to interpret static load test results recalling the basic skills needed in the design and construction of earth retaining structures. The maximum test load or test pressure expressed as a reading on the gauge in use shall be displayed and all operators shall be made aware of this limit. Step 11 static load testing test loading is the most definitive method of determining load capacity of a pile. This timber pile design and construction manual has been developed by the american wood preservers institute awpi as its official recommendation for timber piling design and construction.
The data in this publication has been prepared in accordance with recognized engineering principles and is based on available technical data. Pile load tests are expensive to perform but provide value to a structure. Asd, pile length, implementation, limit states, strength limit no restrictions. Index fhwa deep foundation load test database version 2. Measured versus predicted shaft resistance of h and closed. Information is also provided on inspection and load testing procedures, cost data, and contracting methods to facilitate the safe and costeffective use of micropiles on transportation projects. Fhwasa91042, static testing of deep foundations, provides the. To accomplish this goal, the available data were first analyzed for reliability and then placed in a newly designed relational database management system termed pile load tests pilot, to which this first volume of the final report for project tr573 is dedicated.
For smaller groups and single piles, less redundancy will be present. This timber pile design and construction manual has been developed by the southern. Static load tests may be recommended when piles are installed in soils with variable. The osterberg cell for load testing drilled shafts and driven piles 1994. They generally cannot support as much load as a drilled shaft, so are often grouped under footings when heavy loads need to be supported. The information from this fhwa document has been condensed to focus solely on timber.
Pile driving analyzer pda, and developed a fifth method, called the corrected fhwagates. Driven pile design design manual iowa department of. Although the manual reading and recording of dial gauges employed in a static loading test should present no insurmountable difficulty in terms of accuracy and regularity, it. Lrfd micropile design and testing for major urban bridges 1 presented by. These efforts provide a reasonable basis for design and load testing has confirmed that this type of analyses is. The first collection of load tests compiles results of several smaller load test databases. High strain dynamic pile testing hsdpt with the pile driving analyzer pda was first offered by pile dynamics inc. Jul 07, 2010 new fhwa drilled shaft manual is done. Preface this inspectors manual for driven pile foundations provides basic information for the pile inspector about site investigation, pile types, wave equation analysis, test. The design shall conform with applicable provisions of the building code, fhwa micro pile design and construction guidelines, and accepted industry practice. Chapter 8 static pile load testing and pile dynamic analysis pile. Load and resistance factor design lrfd for deep foundations.
Apr 24, 2019 the long anticipated update to fhwa gec 10 drilled shafts. Dynamic formulas, namely the fhwa modified gates and the. Fhwahrt05159 june 2006 research, development, and technology turnerfairbank highway research center 6300 georgetown pike mclean, va 221012296. The test pile will be considered failure when a rapid progressive movement of the pile in the direction of loading under a constant load or physical failure of the test pile is observed or a settlement of more than 15% of the diagonal dimension of the pile, which is equivalent to 90 mm. Guidelines for successful high strain dynamic load tests. This database user manual provides an overview of the new deep foundation load test database. Ltc believes that proper engineering analysis can mitigate some of the drawbacks while rationally addressing the differences between a scaleddown test pile and fullscale production pile. Lrfd micropile design and testing for major urban bridges. Typical data required from a conventional static load test are the record of displacement of the pile head and the load applied. Fhwa sa91042, static testing of deep foundations, provides the following recommendations on when to perform a pile load test.
Select pile types, ultimate capacities, and pile penetration depths for group sizing. This chapter discusses the driven pile and drilled shaft foundation types based on the information in the following primary references. Codes, specifications and guidelines pertinent to dynamic load testing and wave equation analysis september 2015. Specification for piling contract documentation and measurement, 1 jan 1988 2526 content tools. Methods, setup, load test, drivability, wave equation analysis. A pile is installed by hammering it into the ground using a pile driving hammer. Measured versus predicted shaft resistance of h and. Major emphasis was given to load test results in which predicted capacity could be compared with capacity measured from a static load test.
Drivability of pile types to penetration depths and sufficient ultimate capacities 11. Evaluation of fhwa pile design methods against the. The static capacity prediction methods used for this project include the spt method meyerhof, 1976, federal highway administration. Administrations design and construction of driven pile foundations fhwahi970. The device consists of a smalldiameter steel rod that is. A second pile served as reaction pile in the static load test and was tested dynamically. The use of the pile driving analyzer for installing pile. Fhwa nhi05042 design and onstruction of driven pile foundations fhward83059 allowable stresses in piles. Effect of pile type, pile length, and the pile diameter on the q c q m is explored. This manual is an update and revision of fhwahi97021 prepared by goble. What action does the engineer take when pile bearing capacity is not obtained at specified tip or reaches refusal 15 feet above tip elevation. Implementation of lrfd geotechnical design for deep. The goal of the test was to verify that pile head displacement was similar. The static pile load test manual gcp18 presents uniform procedures for statewide conduct and reporting of results of static pile load tests used to test micropiles in order to confirm design assumptions, or provide information to allow those assumptions and the pile design to be modified.
Preface this inspectors manual for driven pile foundations provides basic information for the pile inspector about site investigation, pile types, wave equation analysis, test piles, dynamic and static load tests, pile driving. Characteristic pile resistance from profiles of ground test results part 2 of en 1997 includes the following annexes. Highway administration fhwa subsequently funded a project starting in 1964 for further development of the technology fhwa ref. Construction procedures and design methods has finally been released by fhwa, the same team that authored the major update in 2010 that shifted design from asd to lrfd also completed this update. Implementation of aashto lrfd bridge design specification. Generally, load test providers discourage scaled pile testing, because it is a conservative way to eliminate the cons. The results of this micropile load test, on a pile with high slenderness ratio and high stiffness of surrounding rock, confirmed that most of the applied load was carried by the pile shaft. Testing a pile to failure provides valuable information to the design engineer and is recommended for load tests performed prior to the foundation design. Dot prestressed pile details include these piles but the bridge design manual does not provide allowable pile design loads dot square prestressed concrete pile details include these piles but the structures manual does not provide allowable pile design loads load factor 1. Over 1,500 load tests were collected and stored for various types of piles and drilled shafts in different soil conditions. In simple terms, a fhwa document that may require the members of the public to do something, or prohibit them from doing something, is a regulation. The design shall conform with applicable provisions of the building code, fhwa micropile design and construction guidelines, and accepted industry practice. This timber pile design and construction manual has been developed by the southern pressure treater s association as its official recommendation for timber piling design and construction.
Increased lrfd axial resistance factors for piling using. This document is available state, resistance, static analysis methods, dynamic analysis to the public from the sponsoring agency. Volume ii, fhwanhi16010, addresses static load tests, dynamic testing. All types of foundations are discussed in the manual, along with related problems and possible solutions. The efficacy of the fhwa pile design method was explored using data made possible by the 2017 release of fhwa deep foundation load test database dfltd v. Geotechnical load and resistance factor design by mir zaheer, p. Tests that achieve a failure load may help the designer improve the efficiency of the foundation by reducing the piling length, quantity, or size. Piling can be designed to support modest compressive and lateral loads. The foundation manual original published by caltrans is intended to provide the field engineer with information that will assist in solving foundation problems and in making engineering decisions although the field engineer is required to make engineering decisions throughout the life of a construction project, none is probably more important than the engineers decision regarding the. Load test types in the new database include axial static, rapid statnamic, and. Now that the lrfd statistical calibration to static pile load tests has been completed by iowa state university isu in 2012 this section of the lrfd bridge design manual has been rewritten to adopt geotechnical and target driving resistance factors from. Mar 06, 2018 generally, load test providers discourage scaled pile testing, because it is a conservative way to eliminate the cons.
Scdot geotechnical design manual geotechnical resistance factors august 2008 9i table of contents. This design manual follows the design methodology presented in the federal highway administration s design and construction of driven pile foundations fhwa nhi05042 and. Characteristic pile resistance from profiles of ground test results part 2. Identify most economical pile types from ultimate capacity vs. Codes, specifications and guidelines pertinent to dynamic. Lad test equipment submit for approval information on the test jack and calibration results. The installation procedure for driving piles to capacity was to drive. Timber pile design and construction manual table of contents 1. Jun 30, 2016 information in this manual will aid in answering a multitude of questions such as.
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