EBookClubs

Read Books & Download eBooks Full Online

EBookClubs

Read Books & Download eBooks Full Online

Book Development and Implementation of the DIGGS Format to Perform LRFD Resistance Factor Calibration of Driven Concrete Piles in Florida

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 Canadian Geotechnical Journal

Download or read book Canadian Geotechnical Journal written by and published by . This book was released on 2012 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Load and Resistance Factor Design LRFD Pile Driving Project Phase II Study

Download or read book Load and Resistance Factor Design LRFD Pile Driving Project Phase II Study written by Aaron S. Budge and published by . This book was released on 2014 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driven piles are the most common foundation solution used in bridge construction (Paikowsky et al., 2004). Their safe use requires to reliable verification of their capacity and integrity. Dynamic analyses of driven piles are methods attempting to obtain the static capacity of a pile, utilizing its behavior during driving. Dynamic equations (aka pile driving formulas) are the earliest and simplest forms of dynamic analyses. The development and the examination of such equation tailored for MnDOT demands is presented. In phase I of the study reported by Paikowsky et al. (2009, databases were utilized to investigate previous MnDOT (and other) dynamic formulas and use object oriented programming for linear regression to develop a new formula that was then calibrated for LRFD methodology and evaluated for its performance. This report presents the findings of phase II of the study in which a comprehensive investigation of the Phase I findings were conducted. The studies lead to the development of dynamic formulae suitable for MnDOT foundation practices, its calibrated resistance factors and its application to concrete and timber piles. Phase II of the study also expanded on related issues associated with Wave Equation analyses and static load tests, assisting the MnDOT in establishing requirements and specifications.

Book Calibration of Resistance Factors for Axial Capacity of Driven Pile Into Missouri Soil

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 Development of LRFD Driven Pile Resistance Factor by First Order Second Moment Method in Alabama Soils

Download or read book Development of LRFD Driven Pile Resistance Factor by First Order Second Moment Method in Alabama Soils written by Elisa D. Prado Villegas and published by . This book was released on 2015 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Calibration of Load and Resistance Factor Design LRFD Resistance Factors for Geotechnical Designs in the State of Florida

Download or read book Calibration of Load and Resistance Factor Design LRFD Resistance Factors for Geotechnical Designs in the State of Florida written by William Andrew Singletary and published by . This book was released on 1998 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Practices for Local Calibration of LRFD Geotechnical Resistance Factors

Download or read book Practices for Local Calibration of LRFD Geotechnical Resistance Factors written by Andrew Boeckmann and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than 15 years have passed since the U.S. transportation industry started its transition from allowable stress design (ASD) to load and resistance factor design (LRFD). For geotechnical design, the AASHTO LRFD Bridge Design Specifications includes provisions that allow state departments of transportation (DOTs) to develop their own design methods and resistance factors. The TRB National Cooperative Highway Research Program's NCHRP Synthesis 601: Practices for Local Calibration of LRFD Geotechnical Resistance Factors documents the extent to which state DOTs have developed agency-specific geotechnical design methods and resistance factors and also details the challenges of the development and benefits resulting from implementation of the methods.

Book Calibration of Resistance Factors for Driven Piles Using Static and Dynamic Tests

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 Load and Resistance Factor Design Calibration to Determine a Resistance Factor for the Modification of the Kansas Department of Transportation Engineering News Record Formula

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 Research Project Work Plan for Calibration of LRFD Resistance Factor for the Wave Equation Analysis of Pile Driving Program

Download or read book Research Project Work Plan for Calibration of LRFD Resistance Factor for the Wave Equation Analysis of Pile Driving Program written by Trevor Smith and published by . This book was released on 2008 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: