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Calibration Of Resistance Factors For Axial Capacity Of Driven Pile Into Missouri Soil
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Book Synopsis Calibration of Resistance Factors for Axial Capacity of Driven Pile Into Missouri Soil by : Mulugeta Abay Kebede
Download or read book Calibration of Resistance Factors for Axial Capacity of Driven Pile Into Missouri Soil written by Mulugeta Abay Kebede and published by . This book was released on 2010 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Over the past two decades the load resistance factor design (LRFD) has been accepted by the American Association for Transportation and Highway Officials (AASHTO) for the design of bridges. This approach is now gaining widespread popularity in the United States for substructure bridge design, including the design of driven pile foundations, as the states calibrate the geotechnical resistance factors for local geological conditions and practices. This study presents the geotechnical resistance factors calibrated for axially driven pile using the first-order reliability method (FORM) for the target reliability index of 2.33 and 3.0 based on 64 end-of-drives (EOD) and 22 beginning-of restrike (BOR) pile driving analyzer (PDA) test data from nine bridge sites in Missouri. Three static pile capacity prediction methods were used, i.e. the Nordlund, Meyerhof and Beta methods. The work investigated the efficiency of each method based on the bias factor, the ratio of the measured to the predicted capacity of the pile, ([lambda] = R[subscript m]/R[subscript p]), the coefficient of variation (COV), and efficiency factor or the ratio of the resistance factor to the bias factor, ([phi]/[lambda]). It verified that the Beta and Nordlund methods provide better predictions than the Meyerhof method. In addition, a comparison of the resistance factor in current AASHTO LRFD with the calibrated resistance factor shows that validating the resistance factors in the AASHTO may result in less reliable design. Finally, the recommended resistance factors for LRFD design are provided for use in Missouri. In addition, further refinement of the developed resistance factors is recommended to improve the resistance factors using large quantity and high quality of data that cover wide areas the glaciated plain and southeast lowland geological regions"--Abstract, leaf iii.
Book Synopsis Driven Pile Load Test Data for Load and Resistance Factor Design in Missouri by : Joseph Ronson Cravens
Download or read book Driven Pile Load Test Data for Load and Resistance Factor Design in Missouri written by Joseph Ronson Cravens and published by . This book was released on 2011 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Missouri Department of Transportation (MoDOT) has recently migrated from allowable stress design (ASD) to load and resistance factor design (LRFD) of driven piles. This transition was initiated when the Federal Highway Administration (FHWA) issued a policy stating that all new bridge designs shall be designed in accordance with the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications to eliminate the difference in design methodologies for bridge superstructures and bridge substructures. However, the resistance factors for driven piles specified in the AASHTO LRFD specifications are based on nationwide pile data, consisting of a wide range of different geologies, subsurface conditions, and installation procedures. For MoDOT to fully benefit from the transition from ASD to LRFD, resistance factors based on MoDOT's local practices and geologic conditions must be developed. The presented research was dedicated to collecting pile load test data to allow the calibration of resistance factors for ultimate limit state design for predictive methods used by MoDOT to determine pile capacity, as well as to develop related reliability-based quality control criteria of driven pile foundations. MoDOT's current state of practice was evaluated and all available pile load test data was collected. However, MoDOT has records for only 10 pile load tests. Therefore, the search was extended to Missouri's eight neighboring states by distributing questionnaires to surrounding state transportation administrations in hope of gathering pile data. Surrounding states have different geologic conditions, but any collected pile data could be matched to similar soil and rock formations in Missouri's geologic regions. Only five out of eight states responded to the questionnaire, and there was no pile load test data obtained from the states that responded. Therefore, the calibration of resistance factors could not be performed based on the research approaches. The deformation behavior of MoDOT bridge pile foundations was also evaluated at the serviceability limit state by modeling pile foundations in FB-MultiPier. The results indicated that pile displacement is an important factor for the development of serviceability resistance factors for pile foundations. Lastly, recommendations for future MoDOT practice and future research efforts regarding driven piles are provided"--Abstract, leaf iii.
Book Synopsis Development of Resistance Factors for Axial Capacity of Driven Piles in North Carolina by :
Download or read book Development of Resistance Factors for Axial Capacity of Driven Piles in North Carolina written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Resistance factors were developed in the framework of reliability theory for the Load and Resistance Factor Design (LRFD) of driven pile's axial capacity in North Carolina utilizing pile load test data available from the North Carolina Department of Transportation. A total of 140 Pile Driving Analyzer (PDA) data and 35 static load test data were compiled and grouped into different design categories based on four pile types and two geologic regions. Resistance statistics were evaluated for each design category in terms of bias factors. Bayesian updating was employed to improve the statistics of the resistance bias factors, which were derived from a limited number of pile load test data. Load statistics presented in the current AASHTO LRFD Bridge Design Specifications were used in the reliability analysis and the calibration of the resistance factors. Reliability analysis of the current NCDOT practice of pile foundation design was performed to evaluate the level of safety and to select the target reliability indices. Resistance factor calibration was performed for the three methods of static pile capacity analysis commonly used in the NCDOT: the Vesic, the Nordlund, and the Meyerhof methods. Two types of First Order Reliability Methods (Mean Value First Order Second Moment method and Advanced First Order Second Moment method) were employed for the reliability analysis and the calibration of the resistance factors. Recommended resistance factors are presented for the three methods of static pile capacity analysis and for seven different design categories of pile types and geologic regions. The resistance factors developed and recommended from this research are specific for the pile foundation design by the three static capacity analysis methods and for the distinct soil type of the geologic regions of North Carolina. The methodology of the resistance factor calibration developed from this research can be applied to the resistance factor calibration for other foundation.
Book Synopsis Calibration of Resistance Factors Needed in the LRFD Design of Driven Piles by : Murad Yusuf Abu-Farsakh
Download or read book Calibration of Resistance Factors Needed in the LRFD Design of Driven Piles written by Murad Yusuf Abu-Farsakh and published by . This book was released on 2009 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Resistance Factors for Axial Capacity of Driven Piles in North Carolina by : Kyung Jun Kim
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.
Book Synopsis Calibration of Resistance Factors for Driven Piles Using Static and Dynamic Tests by : Deshinka Arimena Bostwick
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.
Book Synopsis Accuracy of Static Capacity Methods and Calibration of Resistance Factors for Driven Piles in Rhode Island Soils by : Sean Davis
Download or read book Accuracy of Static Capacity Methods and Calibration of Resistance Factors for Driven Piles in Rhode Island Soils written by Sean Davis and published by . This book was released on 2012 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Load and Resistance Factor Design (LRFD) for Analysis/design of Piles Axial Capacity by :
Download or read book Load and Resistance Factor Design (LRFD) for Analysis/design of Piles Axial Capacity written by and published by . This book was released on 2002 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Two Driven Pile Load Tests for Use in Missouri LRFD Guidelines by : Matthew Garry Stuckmeyer
Download or read book Two Driven Pile Load Tests for Use in Missouri LRFD Guidelines written by Matthew Garry Stuckmeyer and published by . This book was released on 2014 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A static pile load test program was initiated by the Missouri Department of Transportation (MoDOT) to evaluate the use of pile load tests in Missouri LRFD guidelines. The program's approach involves two phases to achieve the appropriate levels of reliability for driven piles in the state of Missouri. This thesis focuses on the data collection efforts of Phase 1. Two quick static pile load tests were performed to failure on test piles in the Southeast Lowlands geologic region of Missouri. The piles were dynamically monitored during installation and subsequent restrike tests performed. The results of the static and dynamic pile testing were evaluated and interpreted. Overall, the nominal resistances predicted by dynamic tests (CAPWAP) at beginning of restrike (BOR) compared well to the results of the static load tests evaluated using Davisson's method (at these specific sites). A comparison of the load transfer distributions from the dynamic and static load tests provided mixed results. The effects of pile set-up after driving are a significant factor to consider in determining the need for a restrike. The additional resistance available following pile setup can have a substantial effect on the nominal resistance determined using dynamic methods. When BOR capacities are measured using dynamic methods they can be used with confidence for the calibration of resistance factors with respective pile types and geologic units. Available pile load test data sets from Missouri's neighboring states and previous efforts conducted in Missouri were compiled as well. Two recently available pile load test databases were evaluated and considered for the upcoming phase to conduct calibration of resistance factors."--Abstract, page iii.
Book Synopsis Driven Pile Load Test Data Analysis and Calibration of LRFD Resistance Factor for Mississippi Soils by : Eric Steward
Download or read book Driven Pile Load Test Data Analysis and Calibration of LRFD Resistance Factor for Mississippi Soils written by Eric Steward and published by . This book was released on 2018 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Load and Resistance Factor Design and Construction Control of Driven Piles in Intermediate Geomaterials by : Pramila Adhikari
Download or read book Load and Resistance Factor Design and Construction Control of Driven Piles in Intermediate Geomaterials written by Pramila Adhikari and published by . This book was released on 2019 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Static Analysis methods originally developed for soils are currently used for estimating pile resistances in Intermediate Geomaterials (IGMs), and structural capacity has been considered as the limiting pile capacity on hard rocks. The application of current Load and Resistance Factor Design (LRFD) for piles in IGMs has resulted in relatively high uncertainties in pile resistance estimation during design and the length to which the piles are driven into IGMs during construction. Moreover, the absence of standard criteria to differentiate the geomaterials creates challenges in the design and construction of driven piles in IGMs. The application of a dynamic analysis method using Wave Equation Analysis Program is constrained by geomaterial input for IGMs and rocks. These current challenges have led to conservative pile resistance estimations. Thus, the overall objectives of this study were to determine efficient static analysis methods, dynamic procedures for construction control, pile setup/relaxation, and resistance factors for the estimation of the axial pile resistances in IGMs, ensuring a prescribed level of reliability to meet LRFD philosophy. To accomplish these objectives, classification criteria of geomaterials were first created to establish a standard quantitative delineation between the soils, IGMs, and hard rocks for the design of driven piles. In addition, a catalog of IGM properties was prepared to facilitate the preliminary design of piles in IGMs. Secondly, a new set of design equations were developed and validated for IGMs by utilizing the developed geomaterial classification criteria. Thirdly, wave equation analysis procedures for IGMs were recommended for pile construction control. Fourthly, changes in pile resistances in IGMs with respect to time at an End of Driving and Beginning of Restrike were assessed. Finally, probability based resistance factors were calibrated and recommended based on the efficiency factors for the existing and calibrated static analysis methods. Calibrated static analysis methods were concluded to have higher efficiency factors of 0.61, 0.30, and 0.41 against efficiency factors of 0.28, 0.09, and 0.14 corresponding to existing static analysis methods for shaft resistance estimation in IGMs. Similarly, calibrated static analysis methods were concluded to have higher efficiency factors of 0.24 and 0.48 against efficiency factors of 0.13 and 0.29 corresponding to existing static analysis methods for end bearing estimation in IGMs.
Book Synopsis Calibration of Resistance Factors for Load and Resistance Factor Design of Driven Piles for Bridge Foundations by : Yu- Ting Su
Download or read book Calibration of Resistance Factors for Load and Resistance Factor Design of Driven Piles for Bridge Foundations written by Yu- Ting Su and published by . This book was released on 2005 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rapid Load Testing on Piles by : Paul Holscher
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.
Book Synopsis Load and Resistance Factor Design Calibration to Determine a Resistance Factor for the Modification of the Kansas Department of Transportation-Engineering News Record Formula by : Jennifer Penfield
Download or read book Load and Resistance Factor Design Calibration to Determine a Resistance Factor for the Modification of the Kansas Department of Transportation-Engineering News Record Formula written by Jennifer Penfield and published by . This book was released on 2014 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains the results of a study describing the development of resistance factors for use with the Kansas Department of Transportation (KDOT) Engineering News Record (ENR) formula for driven piles. KDOT has verified driven pile resistance for many years using a version of the ENR formula. This formula yields estimates of nominal resistance values that are much lower than the actual resistance, based on department experience and comparisons with other resistance measurement methods. For this study actual ENR resistance estimates were compared with estimates obtained using a pile driving analyzer (PDA) system. The PDA values were taken as the true capacity. There were 175 end-of-drive data points and 189 restrike data points available for statistical analysis. A set of correction (resistance) factors to be used with the ENR formula was developed, with individual factors based on given probabilities of pile failure (capacity being exceeded).
Book Synopsis Evaluation of Pile Load Tests for Use in Missouri LRFD Guidelines by :
Download or read book Evaluation of Pile Load Tests for Use in Missouri LRFD Guidelines written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research studied the use of pile load tests for the development of resistance factors in the LRFD design specifications currently adopted by the Missouri DOT. To this end, three (3) bridge sites were identified to conduct a pile load test in conjunction with the normal bridge contracting activities. This allowed a side by side comparisons with production piles and the impact to the design. Since most of the issues with pile driving and pile capacities are for friction piles that require dynamic testing, the pile load tests locations were selected in geologic regions with relatively deep firm ground or bedrock. In this way, an end bearing condition was avoided. Two sites were selected in the Southeastern Lowlands region and one in the Northern Glaciated Plains region. The pile load tests yielded high resolution data for both the load capacity and load transfer distributions. The different pile and soil types produced different degrees of pile setup and these conditions were examined with a series of restrikes, as necessary. Full displacement piles in overconsolidated clays had unexpected results and the highest restrike capacities comp ared to the other sites. All the static and dynamic pile load tests produced capacities higher than the ones estimated by the design engineers. The resistance factors back calculated based on the pile load test data generated higher resistance factors than the 0.65 suggested by AASHTO LRFD specifications. Additionally, pile load tests data from other sources in Missouri and the neighboring states were collected and compiled for future use by the Missouri DOT.
Book Synopsis Development and Implementation of the DIGGS Format to Perform LRFD Resistance Factor Calibration of Driven Concrete Piles in Florida by : Mark Anthony Styler
Download or read book Development and Implementation of the DIGGS Format to Perform LRFD Resistance Factor Calibration of Driven Concrete Piles in Florida written by Mark Anthony Styler and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: National Cooperative Highway Research Program (NCHRP) Report 507 demonstrates that the difference between FORM and FOSM resistance factor calibrations can be up to 15%. With some pile caps containing in excess of 25 piles, millions could be saved if this difference could be accounted for. Currently, the more conservative FOSM is used instead of designing for a specific probability of failure. This thesis explored the difference between FOSM and FORM using DIGGS, a newly developed standard for digitally storing geotechnical data. The DIGGS standard was developed and documented and a DIGGS file containing 62 prestressed concrete piles from the State of Florida was created. These piles were also analyzed with the Bridge Software Institute s FB-Deep program to predict Davission Failure limits. Resistance factors were then calculated using both FOSM and FORM for the Davission Limit using FB-Deep. The results found agreed with the NCHRP 507 with FORM resistance factor calibrations being 8% to 23% greater than FOSM. Following this, a corrected FOSM equation was derived which agrees with the FORM results. Using the modified FOSM equation resistance factors can be more accurately predicted. Designers should recognize that using the larger resistance factors results in a larger probability of failure, but more importantly it results in a known probability of failure.
Book Synopsis Model Uncertainties in Foundation Design by : Chong Tang
Download or read book Model Uncertainties in Foundation Design written by Chong Tang and published by CRC Press. This book was released on 2021-03-17 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
