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Practices For Local Calibration Of Lrfd Geotechnical Resistance Factors
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Book Synopsis Practices for Local Calibration of LRFD Geotechnical Resistance Factors by : Andrew Boeckmann
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 Synopsis Calibration of LRFD Geotechnical Axial (tension and Compression) Resistance Factors (φ) for California by : Xinbao Yu
Download or read book Calibration of LRFD Geotechnical Axial (tension and Compression) Resistance Factors (φ) for California written by Xinbao Yu and published by . This book was released on 2017 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Modern Geotechnical Design Codes of Practice by : Patrick Arnold
Download or read book Modern Geotechnical Design Codes of Practice written by Patrick Arnold and published by IOS Press. This book was released on 2013 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ground is one of the most highly variable of engineering materials. It is therefore not surprising that geotechnical designs depend on local site conditions and local engineering experience. Engineering practices, relating to investigation and design methods site understanding and to safety levels acceptable to society, will therefore vary between different regions.The challenge in geotechnical engineering is to make use of worldwide geotechnical experience, established over many years, to aid in the development and harmonization of geotechnical design codes. Given the significant uncertainties involved, empiricism and engineering
Book Synopsis Calibration of Load and Resistance Factor Design (LRFD) Resistance Factors for Geotechnical Designs in the State of Florida by : William Andrew Singletary
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 Synopsis Development of LRFD Design Procedures for Bridge Piles in Iowa by :
Download or read book Development of LRFD Design Procedures for Bridge Piles in Iowa written by and published by . This book was released on 2011 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Federal Highway Administration (FHWA) mandated utilizing the Load and Resistance Factor Design (LRFD) approach for all new bridges initiated in the United States after October 1, 2007. As a result, there has been a progressive move among state Departments of Transportation (DOTs) toward an increased use of the LRFD in geotechnical design practices. For the above reasons, the Iowa Highway Research Board (IHRB) sponsored three research projects: TR-573, TR-583 and TR-584. The research information is summarized in the project web site (http://srg.cce.iastate.edu/lrfd/). Two reports of total four volumes have been published. Report volume I by Roling et al. (2010) described the development of a user-friendly and electronic database (PILOT). Report volume II by Ng et al. (2011) summarized the 10 full-scale field tests conducted throughout Iowa and data analyses. This report presents the development of regionally calibrated LRFD resistance factors for bridge pile foundations in Iowa based on reliability theory, focusing on the strength limit states and incorporating the construction control aspects and soil setup into the design process. The calibration framework was selected to follow the guidelines provided by the American Association of State Highway and Transportation Officials (AASHTO), taking into consideration the current local practices. The resistance factors were developed for general and in-house static analysis methods used for the design of pile foundations as well as for dynamic analysis methods and dynamic formulas used for construction control. The following notable benefits to the bridge foundation design were attained in this project: 1) comprehensive design tables and charts were developed to facilitate the implementation of the LRFD approach, ensuring uniform reliability and consistency in the design and construction processes of bridge pile foundations; 2) the results showed a substantial gain in the factored capacity compared to the 2008 AASHTO-LRFD recommendations; and 3) contribution to the existing knowledge, thereby advancing the foundation design and construction practices in Iowa and the nation.
Book Synopsis Calibrating Resistance Factors in the Load and Resistance Factor Design for Florida Foundations by : Michael C. McVay
Download or read book Calibrating Resistance Factors in the Load and Resistance Factor Design for Florida Foundations written by Michael C. McVay and published by . This book was released on 1998 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Calibration to Determine Load and Resistance Factors for Geotechnical and Structural Design by : Tony M. Allen
Download or read book Calibration to Determine Load and Resistance Factors for Geotechnical and Structural Design written by Tony M. Allen and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NCHRP Report 507 written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geotechnical Risk and Safety by : Yusuke Honjo
Download or read book Geotechnical Risk and Safety written by Yusuke Honjo and published by CRC Press. This book was released on 2009-06-01 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Communication of risks within a transparent and accountable framework is essential in view of increasing mobility and the complexity of the modern society and the field of geotechnical engineering does not form an exception. As a result, modern risk assessment and management are required in all aspects of geotechnical issues, such as planning, desi
Book Synopsis Geotechnical Related Development and Implementation of Load and Resistance Factor Design (LRFD) Methods by : George G. Goble
Download or read book Geotechnical Related Development and Implementation of Load and Resistance Factor Design (LRFD) Methods written by George G. Goble and published by Transportation Research Board. This book was released on 1999 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis report will be of interest to geotechnical, structural, and bridge engineers, especially those involved in the development and implementation of the geotechnical aspects of the AASHTO Bridge Code. The synthesis documents a review of geotechnical related LRFD specifications and their development worldwide to compare them with the current AASHTO LRFD Bridge Code. Design procedures for foundations, earth retaining structures, and culverts are summarized and compared with the methods specified by the AASHTO code. This TRB report provides information designed to assist engineers in implementing the geotechnical features of LRFD methods. Information for the synthesis was collected by surveying U.S. and Canadian transportation agencies and by conducting a literature search using domestic and international sources. Interviews were also conducted with selected international experts. The limited available experience in the United States and information from international practice are discussed to understand the problems that have arisen in order that solutions may be found. Based on the studies reported here, suggestions for improving the code are identified.
Book Synopsis Limit State Design In Geotechnical Engineering Practice, Proceedings Of The International Workshop Lsd2003 (With Cd-rom) by : Kok Kwang Phoon
Download or read book Limit State Design In Geotechnical Engineering Practice, Proceedings Of The International Workshop Lsd2003 (With Cd-rom) written by Kok Kwang Phoon and published by World Scientific. This book was released on 2003-12-19 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication contains the abstracts of 20 papers, the majority of which were presented at the International Workshop on Limit State Design in Geotechnical Engineering Practice (LSD2003). The complete contributions are available in the accompanying CD-ROM (special lecture not included). The topics covered include: performance-based and limit state design philosophies; issues arising from the implementation of limit state design codes; elaborations of “measured values”, “derived values” and “characteristic values”; reliability-based methodologies for analytical calibration of partial factors; and application of partial factors in FEM where highly nonlinear force-deformation behaviors may govern.
Book Synopsis Load and Resistance Factor Design (LRFD) for Deep Foundations by : Samuel G. Paikowsky
Download or read book Load and Resistance Factor Design (LRFD) for Deep Foundations written by Samuel G. Paikowsky and published by Transportation Research Board. This book was released on 2004 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction and research approach -- Findings -- Interpretation, appraisal, and applications -- Conclusions and suggested research -- Bibliography -- Appendixes.
Book Synopsis LRFD Pullout Resistance Factor Calibration for Soil Nails Incorporating Survival Analysis and PLAXIS 2D by : Brett DeVries
Download or read book LRFD Pullout Resistance Factor Calibration for Soil Nails Incorporating Survival Analysis and PLAXIS 2D written by Brett DeVries and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of soil nail walls (SNWs) in the United States has increased since their introduction in the mid-1970's, to where currently the analysis, design and construction are commonly performed (Lazarte, 2011). These SNW designs were mostly based on ASD methods and LRFD-based methodologies were lacking until the 1998 FHWA manual on SNW design (Byrne, Cotton, Porterfield, Wolschlag and Ueblacker, 1998), which provided uncalibrated resistance factors developed from ASD safety factors. As a result, little improvement was made toward a more efficient design, until fully calibrated LRFD pullout resistance factors were provided in the NCHRP Report 701 (Lazarte, 2011). These pullout resistance factors were calibrated with a variety of load factors commonly used for retaining structures as part of a bridge substructure. Although fully calibrated resistance factors were calculated, the predicted pullout resistance was not based a specific design procedure, but rather on multiple design procedures (Lazarte, 2011). The main objective of this study was to achieve a greater understanding of the bond strength of soil nails in North Dallas Texas. In an effort to accomplish this objective, pullout resistance factors were calibrated for cohesive soils within the project location. Pullout resistances were determined using creep test data, field observations, and methods commonly used in tension piles. This resulted in 25 cases that met failure criteria out of the 47 verification tests conduction in cohesive soil for the LBJ Express construction project. Statistical analysis was conducted to evaluate the predicted to measured pullout resistance for the failed tests, and Survival Analysis was utilized to incorporate the non-failed tests. In addition, PLAXIS 2D was used to fit a finite element model to testing results and used to predict failure in three cases. Results from analysis test results, Survival Analysis and PLAXIS 2D were combined with the 25 failed cases along with soil nail testing results found in the NCHRP Report 701. Five soil nail databases were established from these results and utilized in the remainder of the study. Then, LRFD reliability analysis using Monte Carlo simulations were performed to calibrate pullout resistance factors at a target reliability index of 2.33 and load factors of 1, 1.35, 1.5, 1.6 and 1.75. The final step involved incorporating SNAILZ to compare the required soil nail length between the existing design method and the calibrated resistance factors for a typical SNW.
Book Synopsis Adjacent Precast Concrete Box Beam Bridges by : H. G. Russell
Download or read book Adjacent Precast Concrete Box Beam Bridges written by H. G. Russell and published by Transportation Research Board. This book was released on 2009 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.
Book Synopsis Geotechnical Safety and Risk V by : T. Schweckendiek
Download or read book Geotechnical Safety and Risk V written by T. Schweckendiek and published by IOS Press. This book was released on 2015-10-09 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geotechnical Risk and Safety V contains contributions presented at the 5th International Symposium on Geotechnical Safety and Risk (5th ISGSR, Rotterdam, 13-16 October 2015) which was organized under the auspices of the Geotechnical Safety Network (GEOSNet) and the following technical committees of the of the International Society of Soil Mechanics and Geotechnical Engineering (ISSGME): • TC304 Engineering Practice of Risk Assessment & Management • TC205 Safety and Serviceability in Geotechnical Design • TC212 Deep Foundations • TC302 Forensic Geotechnical Engineering Geotechnical Risk and Safety V covers seven themes: 1. Geotechnical Risk Management and Risk Communication 2. Variability in Ground Conditions and Site Investigation 3. Reliability and Risk Analysis of Geotechnical Structures 4. Limit-state design in Geotechnical Engineering 5. Assessment and Management of Natural Hazards 6. Contractual and Legal Issues of Foundation and (Under)Ground Works 7. Case Studies, Monitoring and Observational Method The 5th ISGSR is the continuation of a series of symposiums and workshops on geotechnical risk and reliability, starting with LSD2000 (Melbourne, Australia), IWS2002 (Tokyo and Kamakura, Japan), LSD2003 (Cambridge, USA), Georisk2004 (Bangalore, India), Taipei2006 (Taipei, Taiwan), the 1st ISGSR (Shanghai, China, 2007), the 2nd ISGSR (Gifu, Japan, 2009), the 3rd ISGSR (Munich, Germany, 2011) and the 4th ISGSR (Hong Kong, 2013).
