Design Of Short Drilled Shaft Foundations In High Plasticity Clay Under Inclined Loading
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Design Of Short Drilled Shaft Foundations In High Plasticity Clay Under Inclined Loading
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Author : Thornchaya Wejrungsikul
language : en
Publisher:
Release Date : 2011
Design Of Short Drilled Shaft Foundations In High Plasticity Clay Under Inclined Loading written by Thornchaya Wejrungsikul and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Bridges categories.
Drilled shaft foundations are primarily used to support structures such as bridge piers, towers, buildings, transmission towers, and roadway median cable barriers. Generally, the main characteristics of drilled shafts are to transfer the loads to the stronger subsoil layers in the vertical direction and also their ability to withstand lateral movements from lateral loads applied. Though the design of shafts is well established with respect to combinations of loads and moments, their behavior under pullout type inclined loading is not well established. The inclined load applied is the combination of lateral and uplift loads applied at the same time and structures such as ends of cable barriers and transmission towers that are supported by the drilled shafts. This dissertation research mainly focuses on the use of drilled shafts supporting at the ends of the cable median barrier systems. These shafts play an important role in protecting the integrity of the cables thereby reducing cross-over collisions at highway medians. Several foundation problems were recorded in north Texas when drilled shafts were used to connect all the cables of the cable barrier systems. During December 2006 to February 2007, several foundation failures of three cable median barrier were observed in Kaufman County near Dallas without any traffic related vehicular impacts (Heady, 2008). Preliminary investigation of foundation failures showed that failed drilled shafts were located in a high plasticity clay environment. Causes of failures are attributed to cold temperature induced shrinkage in the cables that might have significantly increased the tensions in them. Other factors consist of soil saturation from prolonged rainfall events and also potential use of smaller size drilled shafts at the site. In order to fully understand the causes of failures, the present dissertation research was performed. As a part of this research, various sizes of drilled shafts were designed and constructed in a clayey soil environment similar to the one where foundation distress was observed. Geotechnical sampling and laboratory testing were performed and the test results showed different soil layers including high plasticity clayey soil near the ground surface. Soil strength properties for both unsaturated (field condition) and saturated conditions were determined and these results are used in the analysis of field test results to deduce the causes of foundation distress. A new load test setup for the application of an inclined tensile loading on the drilled shaft was designed to simulate the natural field loading condition exerted by the cables. The capacities of different sizes of drilled shafts from field test were tested and measured with this setup and these results showed that the dimensions of reaction test piers and spacings used between reaction and test piers have yielded results that are not influenced by the boundary effects or reaction shaft movements. All load tests were conducted until the foundations reached failure. Test results were analyzed with both uplift capacity and lateral capacity analyses models proposed by many researchers as well as Finite Element Method (FEM) based numerical modeling in understanding the behaviors of drilled shafts under the inclined loading. After obtaining good simulation results, the analytical models are further used for various hypothetical foundation dimensions and for different undrained shear strengths of soils. These test results are used to develop foundation design charts for inclined loading conditions. Both the selection of a specific design chart and its use are explained. Additionally, drilled shaft construction guidelines for cable barrier systems and recommendation for periodic maintenance are provided.
Design Of Inclined Loaded Drilled Shafts In High Plasticity Clay Environment
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Author : Anand J. Puppala
language : en
Publisher:
Release Date : 2011
Design Of Inclined Loaded Drilled Shafts In High Plasticity Clay Environment written by Anand J. Puppala and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Boring categories.
Drilled Shaft Design And Construction Guidelines Manual
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
Drilled Shaft Design And Construction Guidelines Manual written by Lymon C. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Drilled Shaft Design And Construction Guidelines Manual Construction Procedures And Design For Axial Loading
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
Drilled Shaft Design And Construction Guidelines Manual Construction Procedures And Design For Axial Loading written by Lymon C. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Boring categories.
Drilled Shafts
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Author : Michael W. O'Neill
language : en
Publisher:
Release Date : 1999
Drilled Shafts written by Michael W. O'Neill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Foundations categories.
Drilled Shafts
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Author : National Highway Institute (U.S.)
language : en
Publisher:
Release Date : 1988
Drilled Shafts written by National Highway Institute (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Earthwork categories.
This document was written as a resource for participants in a short course covering the topic of construction and design of drilled shaft foundations for bridges and other structures. It is the second edition of a Federal Highway Administration workbook on construction and design of drilled shafts. The first edition was written in 1988 (FHWA-SA-HI-88-042). While introductory material from the 1988 edition was retained, the emphasis in this document is on providing relatively comprehensive information for engineers who already have some experience with drilled shaft construction and/or design. The initial chapters cover an overview of the characteristics of drilled shafts, site investigations for drilled shafts (to collect information for both construction and design), and details of drilled shaft construction. These chapters are followed by several chapters on the design of drilled shafts in soil and rock for both axial and lateral loading, with examples. Both allowable stress design and load and resistance factor design principles are addressed. Details of design calculations procedures are provided in the appendices.
Drilled Shaft Design And Construction Guidelines Manual Reese L C And Allen J D Structural Analysis And Design For Lateral Loading
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
Drilled Shaft Design And Construction Guidelines Manual Reese L C And Allen J D Structural Analysis And Design For Lateral Loading written by Lymon C. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Boring categories.
Basics Of Foundation Design
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Author : Bengt Fellenius
language : en
Publisher: Lulu.com
Release Date : 2017-03-17
Basics Of Foundation Design written by Bengt Fellenius and has been published by Lulu.com this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-03-17 with Technology & Engineering categories.
The "Red Book" presents a background to conventional foundation analysis and design. The text is not intended to replace the much more comprehensive 'standard' textbooks, but rather to support and augment these in a few important areas, supplying methods applicable to practical cases handled daily by practising engineers and providing the basic soil mechanics background to those methods. It concentrates on the static design for stationary foundation conditions. Although the topic is far from exhaustively treated, it does intend to present most of the basic material needed for a practising engineer involved in routine geotechnical design, as well as provide the tools for an engineering student to approach and solve common geotechnical design problems.
Methodology For Design And Construction Of Drilled Shafts In Cohesive Soils
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Author : Lawrence D. Johnson
language : en
Publisher:
Release Date : 1984
Methodology For Design And Construction Of Drilled Shafts In Cohesive Soils written by Lawrence D. Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
Drilled shaft foundations are widely used in the construction of numerous types of permanent structures such as buildings, residence, bridges, and towers in unstable materials and fills including swelling soils. Much research has been done to develop design procedures for drilled shaft foundations, but few comparisons had ben made to validate the design methodologies for different soils and loading conditions. This report presents a comprehensive evaluation of different design procedures and describes those procedures that offer satisfactory solutions to the design of shaft foundations. Guidelines are provided for the design and construction of drilled shaft foundations subject to axial and lateral loading forces using either effective or total stress analysis.
Overview For Design And Construction Of Drilled Shafts In Cohesive Soils
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Author : Lawrence D. Johnson
language : en
Publisher:
Release Date : 1981
Overview For Design And Construction Of Drilled Shafts In Cohesive Soils written by Lawrence D. Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Foundations categories.
Drilled shaft foundations have become very important in construction of numerous types of structures such as residences, buildings, bridges, and towers on expansive or unstable soils and fills. Much research has been done to improve the design and construction procedures for drilled shafts, but few reports contain criteria for different soils and loading conditions. This report updates and condenses previous work and presents procedures available for design and construction of drilled shaft foundations in cohesive soil under various loading conditions. Guidance is presented for field exploration, laboratory investigations, design concepts and procedures, and construction techniques. The results of the overview show that design procedures are generally highly conservative, particularly those using total stress methods. Such conservatism has frequently been relied upon because no rational basis exists for determining the empirical factors, particularly the reduction factor alpha, required for the total stress methods. Failures of drilled shaft foundations have consequently been associated mostly with construction problems rather than with design. New research should include development of improved and more rational design methods to reduce unnecessary conservatism, determination of long-term effects on drilled shafts, improvements in construction methods, and techniques for troubleshooting problems with drilled shafts. (Author).