Load And Resistance Factor Design Lrfd For Deep Foundations And The Challenges With Implementation Into Design Performance PDF Download
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Author | : Brady J. Bertram |
Publisher | : |
Total Pages | : 120 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Load and Resistance Factor Design (LRFD) for Deep Foundations and the Challenges with Implementation Into Design Performance Book in PDF, ePub and Kindle
In October 2007, the Federal Highway Administration (FHWA) mandated the use of the AASHTO Load and Resistance Factor Design (LRFD) specifications for all new federally-funded transportation infrastructure projects. This includes the design of all federally-funded transportation infrastructure projects. THis includes the design of all geotechnical elements, such as deep foundations, which have historically been excluded from the LRFD requirements.
Author | : Samuel G. Paikowsky |
Publisher | : Transportation Research Board |
Total Pages | : 87 |
Release | : 2004 |
Genre | : Bridges |
ISBN | : 0309087961 |
Download Load and Resistance Factor Design (LRFD) for Deep Foundations Book in PDF, ePub and Kindle
Introduction and research approach -- Findings -- Interpretation, appraisal, and applications -- Conclusions and suggested research -- Bibliography -- Appendixes.
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Total Pages | : |
Release | : 2004 |
Genre | : |
ISBN | : |
Download NCHRP Report 507 Book in PDF, ePub and Kindle
Author | : Haijian Fan |
Publisher | : |
Total Pages | : 177 |
Release | : 2013 |
Genre | : Civil engineering |
ISBN | : |
Download Performance Based Design of Deep Foundations in Spatially Varying Soils Book in PDF, ePub and Kindle
With the implementation of load and resistance factor design (LRFD) by the U.S. Federal Highway Administration, the design of deep foundations is migrating from Level I (e.g., allowable stress design) codes to Level II codes (e.g., LRFD). Nevertheless, there are still unsolved issues regarding the implementation of load and resistance factor design. For example, there is no generally accepted guidance on the statistical characterization of soil properties. Moreover, the serviceability limit check in LRFD is still deterministic. No uncertainties arising in soil properties, loads and design criteria are taken into account in the implementation of LRFD. In current practice, the load factors and resistances are taken as unity, and deterministic models are applied to evaluate the displacements of geotechnical structures. In order to address the aforementioned issues of LRFD, there is a need for a computational method for conducting reliability analysis and computational tools for statistically characterizing the variability of soil properties. The objectives of this research are: 1) to develop a mathematically sound computational tool for conducting reliability analysis for deep foundations; and 2) to develop the associated computational method that can be used to determine the variability model of a soil property. To achieve consistency between the strength limit check and the serviceability limit check of the LRFD framework, performance-based design methodology is developed for deep foundation design. In the proposed methodology, the design criteria are defined in terms of the displacements of the structure that are induced by external loads. If the displacements are within the specified design criteria, the design is considered satisfactory. Otherwise, failure is said to occur. In order to calculate the probability of failure, Monte Carlo simulation is employed. In Monte Carlo simulation, the variability of the random variables that are involved in the reliability analysis is captured by simulating a large number of samples according to their respective probability distributions. Next, the simulations of the random variables are used as the input to the commonly used p-y method and load transfer method to evaluate the load-displacement behavior. Once the displacements are calculated, it can be determined whether or not failure will occur. Accordingly, the failure probability is calculated as the number of failure events to the total number of simulations. A series of computer programs have been developed and validated based on the proposed performance-based design methodology. These computer programs can be used to conduct reliability analysis for designing a drilled shaft. To determine the variability model of soil properties that will be used as input to the computer programs, a computational method has been developed in which the blow counts in a standard penetration test are required as inputs. It is found that the consideration of the dependence structure of soil properties is important for reliability analysis.
Author | : Rodrigo Salgado |
Publisher | : Purdue University Press |
Total Pages | : 76 |
Release | : 2011-10-12 |
Genre | : Transportation |
ISBN | : 9781622600076 |
Download Development of Load and Resistance Factor Design for Ultimate and Serviceability Limit States of Transportation Structure Foundations Book in PDF, ePub and Kindle
Most foundation solutions for transportation structures rely on deep foundations, often on pile foundations configured in a way most suitable to the problem at hand. Design of pile foundation solutions can best be pursued by clearly defining limit states and then configuring the piles in such a way as to prevent the attainment of these limit states. The present report develops methods for load and resistance factor design (LRFD) of piles, both nondisplacement and displacement piles, in sand and clay. With the exception of the method for design of displacement piles in sand, all the methods are based on rigorous theoretical mechanics solutions of the pile loading problem. In all cases, the uncertainty of the variables appearing in the problem and of the relationships linking these variables to the resistance calculated using these relationships are carefully assessed. Monte Carlo simulations using these relationships and the associated variabilities allow simulation of resistance minus load distributions and therefore probability of failure. The mean (or nominal) values of the variables can be adjusted so that the probability of failure can be made to match a target probability of failure. Since an infinite number of combinations of these means can be made to lead to the same target probability of failure, we have developed a way to determine the most likely ultimate limit state for a given probability of failure. Once the most likely ultimate limit state is determined, the values of loads and resistances for this limit state can be used, together with the values of the mean (or nominal) loads and resistances to calculate load and resistance factors. The last step in the process involves adjusting the resistance factors so that they are consistent with the load factors specified by AASHTO. Recommended resistance factors are then given together with the design methods for which they were developed.
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Publisher | : |
Total Pages | : |
Release | : 2004 |
Genre | : |
ISBN | : |
Download Load and Resistance Factor Design LRFD for Deep Foundations Book in PDF, ePub and Kindle
Author | : N.P. López-Acosta |
Publisher | : IOS Press |
Total Pages | : 3006 |
Release | : 2019-11-26 |
Genre | : Technology & Engineering |
ISBN | : 1643680315 |
Download Geotechnical Engineering in the XXI Century: Lessons learned and future challenges Book in PDF, ePub and Kindle
The first Pan-American Conference on Soil Mechanics and Geotechnical Engineering (PCSMGE) was held in Mexico in 1959. Every 4 years since then, PCSMGE has brought together the geotechnical engineering community from all over the world to discuss the problems, solutions and future challenges facing this engineering sector. Sixty years after the first conference, the 2019 edition returns to Mexico. This book, Geotechnical Engineering in the XXI Century: Lessons learned and future challenges, presents the proceedings of the XVI Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XVI PCSMGE), held in Cancun, Mexico, from 17 – 20 November 2019. Of the 393 full papers submitted, 335 were accepted for publication after peer review. They are included here organized into 19 technical sessions, and cover a wide range of themes related to geotechnical engineering in the 21st century. Topics covered include: laboratory and in-situ testing; analytical and physical modeling in geotechnics; numerical modeling in geotechnics; unsaturated soils; soft soils; foundations and retaining structures; excavations and tunnels; offshore geotechnics; transportation in geotechnics; natural hazards; embankments and tailings dams; soils dynamics and earthquake engineering; ground improvement; sustainability and geo-environment; preservation of historic sites; forensics engineering; rock mechanics; education; and energy geotechnics. Providing a state-of-the-art overview of research into innovative and challenging applications in the field, the book will be of interest to all those working in soil mechanics and geotechnical engineering. In this proceedings, 58% of the contributions are in English, and 42% of the contributions are in Spanish or Portuguese.
Author | : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations |
Publisher | : |
Total Pages | : 1220 |
Release | : 1993 |
Genre | : United States |
ISBN | : |
Download Department of Transportation and Related Agencies Appropriations for 1994 Book in PDF, ePub and Kindle
Author | : Patrick Arnold |
Publisher | : IOS Press |
Total Pages | : 340 |
Release | : 2013 |
Genre | : Science |
ISBN | : 1614991626 |
Download Modern Geotechnical Design Codes of Practice Book in PDF, ePub and Kindle
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
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Release | : 2004 |
Genre | : Foundations |
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Download Appendixes for NCHRP Report 507 Book in PDF, ePub and Kindle